485BPOS

Registration Nos. 033-49581/811-7059

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D.C. 20549
FORM N-1A

REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933/X/

Post-Effective Amendment No. 44/X/

and/or

REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT OF 1940 /X/

Amendment No. 45/X/

T. ROWE PRICE BLUE CHIP GROWTH FUND, INC.

Exact Name of Registrant as Specified in Charter

100 East Pratt Street, Baltimore, Maryland 21202
Address of Principal Executive Offices

410-345-2000
Registrant’s Telephone Number, Including Area Code

David Oestreicher

100 East Pratt Street, Baltimore, Maryland 21202
Name and Address of Agent for Service

It is proposed that this filing will become effective (check appropriate box):

/X/Immediately upon filing pursuant to paragraph (b)

//On (date) pursuant to paragraph (b)

//60 days after filing pursuant to paragraph (a)(1)

//On (date) pursuant to paragraph (a)(1)

//75 days after filing pursuant to paragraph (a)(2)

//On (date) pursuant to paragraph (a)(2) of Rule 485

Page 2

If appropriate, check the following box:

//This post-effective amendment designates a new effective date for a previously filed post-effective amendment.

Page 3

EXHIBITS

Exhibit	Exhibit No.
XBRL Instance Document	EX-101.INS
XBRL Taxonomy Extension Schema Document	EX-101.SCH
XBRL Taxonomy Extension Calculation Linkbase Document	EX-101.CAL
XBRL Taxonomy Extension Definition Linkbase Document	EX-101.DEF
XBRL Taxonomy Extension Labels Linkbase Document	EX-101.LAB
XBRL Taxonomy Extension Presentation Linkbase Document	EX-101.PRE

Page 4

Signatures

Pursuant to the requirements of the Securities Act of 1933, as amended, and the Investment Company Act of 1940, as amended, the Registrant certifies that it meets all of the requirements for effectiveness of this Registration Statement pursuant to Rule 485(b) under the Securities Act of 1933 and has duly caused this Registration Statement to be signed on its behalf by the undersigned, duly authorized, in the City of Baltimore, State of Maryland, this May 13, 2020.

T. ROWE PRICE BLUE CHIP GROWTH FUND, INC.

/s/David Oestreicher

By:David Oestreicher

Director and Executive Vice President

Pursuant to the requirements of the Securities Act of 1933, as amended, this Registration Statement has been signed below by the following persons in the capacities and on the dates indicated:

Signature	Title	Date
/s/David Oestreicher	Director (Principal Executive Officer)	May 13, 2020
David Oestreicher	and Executive Vice President
/s/Alan S. Dupski	Treasurer	May 13, 2020
Alan S. Dupski	(Principal Financial Officer)
	and Vice President
*
Teresa Bryce Bazemore	Director	May 13, 2020
*
Ronald J. Daniels	Director	May 13, 2020
*
Bruce W. Duncan	Director	May 13, 2020
*
Robert J. Gerrard, Jr.	Chairman of the Board	May 13, 2020
	and Director
*
Paul F. McBride	Director	May 13, 2020
*
Cecilia E. Rouse	Director	May 13, 2020
*
John G. Schreiber	Director	May 13, 2020

Page 5

/s/Robert W. Sharps	Director and Vice President	May 13, 2020
Robert W. Sharps
*/s/David Oestreicher	Attorney-In-Fact	May 13, 2020
David Oestreicher

Page 6

T. ROWE PRICE BALANCED FUND, INC.

T. ROWE PRICE BLUE CHIP GROWTH FUND, INC.

T. ROWE PRICE CAPITAL APPRECIATION FUND, INC.

T. ROWE PRICE CAPITAL OPPORTUNITY FUND, INC.

T. ROWE PRICE COMMUNICATIONS & TECHNOLOGY FUND, INC.

T. ROWE PRICE CORPORATE INCOME FUND, INC.

T. ROWE PRICE CREDIT OPPORTUNITIES FUND, INC.

T. ROWE PRICE DIVERSIFIED MID-CAP GROWTH FUND, INC.

T. ROWE PRICE DIVIDEND GROWTH FUND, INC.

T. ROWE PRICE EQUITY INCOME FUND, INC.

T. ROWE PRICE EQUITY SERIES, INC.

T. ROWE PRICE FINANCIAL SERVICES FUND, INC.

T. ROWE PRICE FIXED INCOME SERIES, INC.

T. ROWE PRICE FLOATING RATE FUND, INC.

T. ROWE PRICE GLOBAL ALLOCATION FUND, INC.

T. ROWE PRICE GLOBAL MULTI-SECTOR BOND FUND, INC.

T. ROWE PRICE GLOBAL REAL ESTATE FUND, INC.

T. ROWE PRICE GLOBAL TECHNOLOGY FUND, INC.

T. ROWE PRICE GNMA FUND, INC.

T. ROWE PRICE GOVERNMENT MONEY FUND, INC.

T. ROWE PRICE GROWTH & INCOME FUND, INC.

T. ROWE PRICE GROWTH STOCK FUND, INC.

T. ROWE PRICE HEALTH SCIENCES FUND, INC.

T. ROWE PRICE HIGH YIELD FUND, INC.

T. ROWE PRICE INDEX TRUST, INC.

T. ROWE PRICE INFLATION PROTECTED BOND FUND, INC.

T. ROWE PRICE INSTITUTIONAL EQUITY FUNDS, INC.

T. ROWE PRICE INSTITUTIONAL INCOME FUNDS, INC.

T. ROWE PRICE INSTITUTIONAL INTERNATIONAL FUNDS, INC.

T. ROWE PRICE INTERMEDIATE TAX-FREE HIGH YIELD FUND, INC.

T. ROWE PRICE INTERNATIONAL FUNDS, INC.

T. ROWE PRICE INTERNATIONAL INDEX FUND, INC.

T. ROWE PRICE INTERNATIONAL SERIES, INC.

T. ROWE PRICE LIMITED DURATION INFLATION FOCUSED BOND FUND, INC.

T. ROWE PRICE MID-CAP GROWTH FUND, INC.

T. ROWE PRICE MID-CAP VALUE FUND, INC.

T. ROWE PRICE MULTI-SECTOR ACCOUNT PORTFOLIOS, INC.

T. ROWE PRICE MULTI-STRATEGY TOTAL RETURN FUND, INC.

T. ROWE PRICE NEW AMERICA GROWTH FUND, INC.
T. ROWE PRICE NEW ERA FUND, INC.

T. ROWE PRICE NEW HORIZONS FUND, INC.

T. ROWE PRICE NEW INCOME FUND, INC.

T. ROWE PRICE PERSONAL STRATEGY FUNDS, INC.

T. ROWE PRICE QUANTITATIVE MANAGEMENT FUNDS, INC.

T. ROWE PRICE REAL ASSETS FUND, INC.

T. ROWE PRICE REAL ESTATE FUND, INC.

T. ROWE PRICE RESERVE INVESTMENT FUNDS, INC.

T. ROWE PRICE RETIREMENT FUNDS, INC.

T. ROWE PRICE SCIENCE & TECHNOLOGY FUND, INC.

T. ROWE PRICE SHORT-TERM BOND FUND, INC.

Page 7

T. ROWE PRICE SMALL-CAP STOCK FUND, INC.

T. ROWE PRICE SMALL-CAP VALUE FUND, INC.

T. ROWE PRICE SPECTRUM FUND, INC.

T. ROWE PRICE STATE TAX-FREE FUNDS, INC.

T. ROWE PRICE SUMMIT FUNDS, INC.

T. ROWE PRICE SUMMIT MUNICIPAL FUNDS, INC.

T. ROWE PRICE TAX-EFFICIENT FUNDS, INC.

T. ROWE PRICE TAX-EXEMPT MONEY FUND, INC.

T. ROWE PRICE TAX-FREE HIGH YIELD FUND, INC.

T. ROWE PRICE TAX-FREE INCOME FUND, INC.

T. ROWE PRICE TAX-FREE SHORT-INTERMEDIATE FUND, INC.

T. ROWE PRICE TOTAL RETURN FUND, INC.

T. ROWE PRICE U.S. BOND ENHANCED INDEX FUND, INC.

T. ROWE PRICE U.S. LARGE-CAP CORE FUND, INC.

T. ROWE PRICE U.S. TREASURY FUNDS, INC.

T. ROWE PRICE VALUE FUND, INC.

POWER OF ATTORNEY

RESOLVED, that the Corporation does hereby constitute and authorize Darrell N. Braman, Catherine D. Mathews, Margery K. Neale, and David Oestreicher, and each of them individually, their true and lawful attorneys and agents to take any and all action and execute any and all instruments which said attorneys and agents may deem necessary or advisable to enable the Corporation to comply with the Securities Act of 1933, as amended, and the Investment Company Act of 1940, as amended, and any rules, regulations, orders or other requirements of the United States Securities and Exchange Commission thereunder, in connection with the registration under the Securities Act of 1933, as amended, of shares of the Corporation, to be offered by the Corporation, and the registration of the Corporation under the Investment Company Act of 1940, as amended, including specifically, but without limitation of the foregoing, power and authority to sign the name of the Corporation on its behalf, and to sign the names of each of such directors and officers on his or her behalf as such director or officer to any (i) Registration Statement on Form N-1A or N-14 of the Corporation filed with the Securities and Exchange Commission under the Securities Act of 1933, as amended; (ii) Registration Statement on Form N-1A or N-14 of the Corporation under the Investment Company Act of 1940, as amended; (iii) amendment or supplement (including, but not limited to, Post-Effective Amendments adding additional series or classes of the Corporation) to said Registration Statement; and (iv) instruments or documents filed or to be filed as a part of or in connection with such Registration Statement, including Articles Supplementary, Articles of Amendment, and other instruments with respect to the Articles of Incorporation of the Corporation.

IN WITNESS WHEREOF, the above named Corporations have caused these presents to be signed and the same attested by its Assistant Secretary, each thereunto duly authorized by its Board of Directors, and each of the undersigned has hereunto set his or her hand and seal as of the day set opposite his or her name.

Page 8

/s/David Oestreicher
David Oestreicher /s/Catherine D. Mathews	Executive Vice President (Principal Executive Officer) Director	April 29, 2019
Catherine D. Mathews /s/Teresa Bryce Bazemore	Treasurer (Principal Financial Officer) Vice President	April 29, 2019
Teresa Bryce Bazemore /s/Ronald J. Daniels	Director	April 29, 2019
Ronald J. Daniels /s/Bruce W. Duncan	Director	April 29, 2019
Bruce W. Duncan /s/Robert J. Gerrard, Jr.	Director	April 29, 2019
Robert J. Gerrard, Jr. /s/Paul F. McBride	Director	April 29, 2019
Paul F. McBride /s/Cecilia E. Rouse	Director	April 29, 2019
Cecilia E. Rouse /s/John G. Schreiber	Director	April 29, 2019
John G. Schreiber /s/Robert W. Sharps	Director	April 29, 2019
Robert W. Sharps	Director	April 29, 2019

(Signatures Continued)

Page 9

ATTEST:

/s/Shannon Hofher Rauser

Shannon Hofher Rauser, Assistant Secretary

XML

Total

T. Rowe Price Blue Chip Growth Fund, Inc.

T. ROWE PRICE Blue Chip Growth Fund Investor Class I Class Advisor Class R Class SUMMARY

Investment Objective(s)

The fund seeks to provide long-term capital growth.

Income is a secondary objective.

Fees and Expenses

This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the fund. You may also incur brokerage commissions and other charges when buying or selling shares of the Investor Class or I Class, which are not reflected in the table.

Fees and Expenses of the Fund Shareholder fees (fees paid directly from your investment)

Shareholder Fees - T. Rowe Price Blue Chip Growth Fund, Inc. - USD ($)	Investor Class		I Class	Advisor Class	R Class
Maximum account fee	$ 20	[1]

Annual fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses - T. Rowe Price Blue Chip Growth Fund, Inc.	Investor Class	I Class	Advisor Class	R Class
Management fees	0.55%	0.55%	0.55%	0.55%
Distribution and service (12b-1) fees			0.25%	0.50%
Other expenses	0.14%	0.01%	0.16%	0.17%
Total annual fund operating expenses	0.69%	0.56%	0.96%	1.22%

Example

This example is intended to help you compare the cost of investing in the fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the fund for the time periods indicated and then redeem all of your shares at the end of those periods, that your investment has a 5% return each year, and that the fund’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Expense Example - T. Rowe Price Blue Chip Growth Fund, Inc. - USD ($)	1 year	3 years	5 years	10 years
Investor Class	70	221	384	859
I Class	57	179	313	701
Advisor Class	98	306	531	1,178
R Class	124	387	670	1,477

Portfolio Turnover

The fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when the fund’s shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the fund’s performance. During the most recent fiscal year, the fund’s portfolio turnover rate was 31.5% of the average value of its portfolio.

Investments, Risks, and Performance Principal Investment Strategies

The fund will normally invest at least 80% of its net assets (including any borrowings for investment purposes) in the common stocks of large and medium-sized blue-chip growth companies. These are firms that, in the investment adviser’s view, are well established in their industries and have the potential for above-average earnings growth. The fund focuses on companies with leading market positions, seasoned management, and strong financial fundamentals. The fund’s investment approach reflects the adviser’s belief that solid company fundamentals (with an emphasis on the potential for strong growth in earnings per share or operating cash flow) combined with a positive outlook for a company’s industry will ultimately reward investors with strong investment performance. Some of the companies the adviser targets for the fund should have good prospects for dividend growth, and the fund may at times invest significantly in stocks of information technology companies.

In pursuing its investment objective(s), the fund has the discretion to deviate from its normal investment criteria. These situations might arise when the adviser believes a security could increase in value for a variety of reasons, including an extraordinary corporate event, a new product introduction or innovation, a favorable competitive development, or a change in management.

While most assets will typically be invested in U.S. common stocks, the fund may invest in foreign stocks in keeping with its objective(s).

The fund may sell securities for a variety of reasons, such as to secure gains, limit losses, or redeploy assets into more promising opportunities.

Principal Risks

As with any fund, there is no guarantee that the fund will achieve its objective(s). The fund’s share price fluctuates, which means you could lose money by investing in the fund. The principal risks of investing in this fund, which may be even greater during periods of market disruption or volatility, are summarized as follows:

Market conditions The value of the fund’s investments may decrease, sometimes rapidly or unexpectedly, due to factors affecting an issuer held by the fund, particular industries, or the overall securities markets. A variety of factors can increase the volatility of the fund’s holdings and markets generally, including political or regulatory developments, recessions, inflation, rapid interest rate changes, war or acts of terrorism, natural disasters, and outbreaks of infectious illnesses or other widespread public health issues. Certain events may cause instability across global markets, including reduced liquidity and disruptions in trading markets, while some events may affect certain geographic regions, countries, sectors, and industries more significantly than others. These adverse developments may cause broad declines in market value due to short-term market movements or for significantly longer periods during more prolonged market downturns.

Stock investing Stocks generally fluctuate in value more than bonds and may decline significantly over short time periods. There is a chance that stock prices overall will decline because stock markets tend to move in cycles, with periods of rising and falling prices. The value of stocks held by the fund may decline due to general weakness or volatility in the stock markets in which the fund invests or because of factors that affect a particular company or industry.

Growth investing The fund’s growth approach to investing could cause it to underperform other stock funds that employ a different investment style. Growth stocks tend to be more volatile than certain other types of stocks and their prices may fluctuate more dramatically than the overall stock market. A stock with growth characteristics can have sharp price declines due to decreases in current or expected earnings and may lack dividends that can help cushion its share price in a declining market.

Large- and mid-cap stocks Securities issued by large-cap and mid-cap companies tend to be less volatile than securities issued by smaller companies. However, larger companies may not be able to attain the high growth rates of successful smaller companies, especially during strong economic periods, and may be unable to respond as quickly to competitive challenges. The fund’s share price could fluctuate more than the share price of a fund that invests only in large companies as stocks of mid-cap companies entail greater risk and are usually more volatile than stocks of large-cap companies.

Dividend-paying stocks The fund’s emphasis on dividend-paying stocks could cause the fund to underperform similar funds that invest without consideration of a company’s track record of paying dividends. Stocks of companies with a history of paying dividends may not participate in a broad market advance to the same degree as most other stocks, and a sharp rise in interest rates or economic downturn could cause a company to unexpectedly reduce or eliminate its dividend.

Sector exposure At times, the fund may have a significant portion of its assets invested in securities of issuers conducting business in a broadly related group of industries within the same economic sector. Issuers in the same economic sector may be similarly affected by economic or market events, making the fund more vulnerable to unfavorable developments in that economic sector than funds that invest more broadly. Investments in the technology sector are susceptible to intense competition, government regulation, changing consumer preferences, and dependency on patent protection.

Foreign investing Investments in the securities of non-U.S. issuers may be adversely affected by local, political, social, and economic conditions overseas, greater volatility, reduced liquidity, or decreases in foreign currency values relative to the U.S. dollar. The risks of investing outside the U.S. are heightened for any investments in emerging markets, which are susceptible to greater volatility than investments in developed markets.

Active management The fund’s overall investment program and holdings selected by the fund’s investment adviser may underperform the broad markets, relevant indices, or other funds with similar objectives and investment strategies.

Performance

The following performance information provides some indication of the risks of investing in the fund. The fund’s performance information represents only past performance (before and after taxes) and is not necessarily an indication of future results.

The following bar chart illustrates how much returns can differ from year to year by showing calendar year returns and the best and worst calendar quarter returns during those years for the fund’s Investor Class. Returns for other share classes vary since they have different expenses.

BLUE CHIP GROWTH FUND Calendar Year Returns

	Quarter Ended	Total Return		Quarter Ended	Total Return
Best Quarter	3/31/12	18.76%	Worst Quarter	12/31/18	-14.22%

The following table shows the average annual total returns for each class of the fund that has been in operation for at least one full calendar year, and also compares the returns with the returns of a relevant broad-based market index, as well as with the returns of one or more comparative indexes that have investment characteristics similar to those of the fund, if applicable.

In addition, the table shows hypothetical after-tax returns to demonstrate how taxes paid by a shareholder may influence returns. After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their fund shares through tax-deferred arrangements, such as a 401(k) account or an IRA. After-tax returns are shown only for the Investor Class and will differ for other share classes.

Average Annual Total Returns Periods ended December 31, 2019

Average Annual Total Returns - T. Rowe Price Blue Chip Growth Fund, Inc.	1 Year	5 Years	10 Years	Since inception		Inception date
Investor Class	29.97%	15.24%	15.97%			Jun. 30, 1993
Investor Class | Returns after taxes on distributions	29.86%	14.72%	15.57%			Jun. 30, 1993
Investor Class | Returns after taxes on distributions and sale of fund shares	17.82%	12.17%	13.50%			Jun. 30, 1993
I Class	30.13%			16.25%		Dec. 17, 2015
Advisor Class	29.62%	14.92%	15.67%			Mar. 31, 2000
R Class	29.28%	14.63%	15.37%			Sep. 30, 2002
S&P 500 Index (reflects no deduction for fees, expenses, or taxes)	31.49%	11.70%	13.56%	14.33%	[1]	Dec. 17, 2015
Lipper Large-Cap Growth Funds Index	33.56%	13.23%	13.67%	15.06%	[1]	Dec. 17, 2015

Updated performance information is available through troweprice.com.

[1] Subject to certain exceptions, accounts with a balance of less than $10,000 are charged an annual $20 fee.

[1] Return since 12/17/15.

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

T. Rowe Price Blue Chip Growth Fund, Inc.

Prospectus Date

rr_ProspectusDate

May 01, 2020

T. Rowe Price Blue Chip Growth Fund, Inc.

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

T. ROWE PRICE Blue Chip Growth Fund Investor Class I Class Advisor Class R Class SUMMARY

Objective [Heading]

rr_ObjectiveHeading

Investment Objective(s)

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The fund seeks to provide long-term capital growth.

Objective, Secondary [Text Block]

rr_ObjectiveSecondaryTextBlock

Income is a secondary objective.

Expense [Heading]

rr_ExpenseHeading

Fees and Expenses

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the fund. You may also incur brokerage commissions and other charges when buying or selling shares of the Investor Class or I Class, which are not reflected in the table.

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Fees and Expenses of the Fund Shareholder fees (fees paid directly from your investment)

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

Annual fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

The fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when the fund’s shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the fund’s performance. During the most recent fiscal year, the fund’s portfolio turnover rate was 31.5% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

31.50%

Expense Example [Heading]

rr_ExpenseExampleHeading

Example

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

This example is intended to help you compare the cost of investing in the fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the fund for the time periods indicated and then redeem all of your shares at the end of those periods, that your investment has a 5% return each year, and that the fund’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Strategy [Heading]

rr_StrategyHeading

Investments, Risks, and Performance Principal Investment Strategies

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

The fund will normally invest at least 80% of its net assets (including any borrowings for investment purposes) in the common stocks of large and medium-sized blue-chip growth companies. These are firms that, in the investment adviser’s view, are well established in their industries and have the potential for above-average earnings growth. The fund focuses on companies with leading market positions, seasoned management, and strong financial fundamentals. The fund’s investment approach reflects the adviser’s belief that solid company fundamentals (with an emphasis on the potential for strong growth in earnings per share or operating cash flow) combined with a positive outlook for a company’s industry will ultimately reward investors with strong investment performance. Some of the companies the adviser targets for the fund should have good prospects for dividend growth, and the fund may at times invest significantly in stocks of information technology companies.

In pursuing its investment objective(s), the fund has the discretion to deviate from its normal investment criteria. These situations might arise when the adviser believes a security could increase in value for a variety of reasons, including an extraordinary corporate event, a new product introduction or innovation, a favorable competitive development, or a change in management.

While most assets will typically be invested in U.S. common stocks, the fund may invest in foreign stocks in keeping with its objective(s).

The fund may sell securities for a variety of reasons, such as to secure gains, limit losses, or redeploy assets into more promising opportunities.

Risk [Heading]

rr_RiskHeading

Principal Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

As with any fund, there is no guarantee that the fund will achieve its objective(s). The fund’s share price fluctuates, which means you could lose money by investing in the fund. The principal risks of investing in this fund, which may be even greater during periods of market disruption or volatility, are summarized as follows:

Market conditions The value of the fund’s investments may decrease, sometimes rapidly or unexpectedly, due to factors affecting an issuer held by the fund, particular industries, or the overall securities markets. A variety of factors can increase the volatility of the fund’s holdings and markets generally, including political or regulatory developments, recessions, inflation, rapid interest rate changes, war or acts of terrorism, natural disasters, and outbreaks of infectious illnesses or other widespread public health issues. Certain events may cause instability across global markets, including reduced liquidity and disruptions in trading markets, while some events may affect certain geographic regions, countries, sectors, and industries more significantly than others. These adverse developments may cause broad declines in market value due to short-term market movements or for significantly longer periods during more prolonged market downturns.

Stock investing Stocks generally fluctuate in value more than bonds and may decline significantly over short time periods. There is a chance that stock prices overall will decline because stock markets tend to move in cycles, with periods of rising and falling prices. The value of stocks held by the fund may decline due to general weakness or volatility in the stock markets in which the fund invests or because of factors that affect a particular company or industry.

Growth investing The fund’s growth approach to investing could cause it to underperform other stock funds that employ a different investment style. Growth stocks tend to be more volatile than certain other types of stocks and their prices may fluctuate more dramatically than the overall stock market. A stock with growth characteristics can have sharp price declines due to decreases in current or expected earnings and may lack dividends that can help cushion its share price in a declining market.

Large- and mid-cap stocks Securities issued by large-cap and mid-cap companies tend to be less volatile than securities issued by smaller companies. However, larger companies may not be able to attain the high growth rates of successful smaller companies, especially during strong economic periods, and may be unable to respond as quickly to competitive challenges. The fund’s share price could fluctuate more than the share price of a fund that invests only in large companies as stocks of mid-cap companies entail greater risk and are usually more volatile than stocks of large-cap companies.

Dividend-paying stocks The fund’s emphasis on dividend-paying stocks could cause the fund to underperform similar funds that invest without consideration of a company’s track record of paying dividends. Stocks of companies with a history of paying dividends may not participate in a broad market advance to the same degree as most other stocks, and a sharp rise in interest rates or economic downturn could cause a company to unexpectedly reduce or eliminate its dividend.

Sector exposure At times, the fund may have a significant portion of its assets invested in securities of issuers conducting business in a broadly related group of industries within the same economic sector. Issuers in the same economic sector may be similarly affected by economic or market events, making the fund more vulnerable to unfavorable developments in that economic sector than funds that invest more broadly. Investments in the technology sector are susceptible to intense competition, government regulation, changing consumer preferences, and dependency on patent protection.

Foreign investing Investments in the securities of non-U.S. issuers may be adversely affected by local, political, social, and economic conditions overseas, greater volatility, reduced liquidity, or decreases in foreign currency values relative to the U.S. dollar. The risks of investing outside the U.S. are heightened for any investments in emerging markets, which are susceptible to greater volatility than investments in developed markets.

Active management The fund’s overall investment program and holdings selected by the fund’s investment adviser may underperform the broad markets, relevant indices, or other funds with similar objectives and investment strategies.

Risk Lose Money [Text]

rr_RiskLoseMoney

The fund’s share price fluctuates, which means you could lose money by investing in the fund.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

Performance

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

The following performance information provides some indication of the risks of investing in the fund. The fund’s performance information represents only past performance (before and after taxes) and is not necessarily an indication of future results.

The following bar chart illustrates how much returns can differ from year to year by showing calendar year returns and the best and worst calendar quarter returns during those years for the fund’s Investor Class. Returns for other share classes vary since they have different expenses.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The following performance information provides some indication of the risks of investing in the fund. The following bar chart illustrates how much returns can differ from year to year by showing calendar year returns and the best and worst calendar quarter returns during those years for the fund’s Investor Class. Returns for other share classes vary since they have different expenses. The following table shows the average annual total returns for each class of the fund that has been in operation for at least one full calendar year, and also compares the returns with the returns of a relevant broad-based market index, as well as with the returns of one or more comparative indexes that have investment characteristics similar to those of the fund, if applicable.

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

troweprice.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

The fund’s performance information represents only past performance (before and after taxes) and is not necessarily an indication of future results.

Bar Chart [Heading]

rr_BarChartHeading

BLUE CHIP GROWTH FUND Calendar Year Returns

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

	Quarter Ended	Total Return		Quarter Ended	Total Return
Best Quarter	3/31/12	18.76%	Worst Quarter	12/31/18	-14.22%

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Total Returns Periods ended December 31, 2019

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their fund shares through tax-deferred arrangements, such as a 401(k) account or an IRA.

Performance Table One Class of after Tax Shown [Text]

rr_PerformanceTableOneClassOfAfterTaxShown

After-tax returns are shown only for the Investor Class and will differ for other share classes.

Performance Table Narrative

rr_PerformanceTableNarrativeTextBlock

The following table shows the average annual total returns for each class of the fund that has been in operation for at least one full calendar year, and also compares the returns with the returns of a relevant broad-based market index, as well as with the returns of one or more comparative indexes that have investment characteristics similar to those of the fund, if applicable.

In addition, the table shows hypothetical after-tax returns to demonstrate how taxes paid by a shareholder may influence returns. After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their fund shares through tax-deferred arrangements, such as a 401(k) account or an IRA. After-tax returns are shown only for the Investor Class and will differ for other share classes.

Performance Table Closing [Text Block]

rr_PerformanceTableClosingTextBlock

Updated performance information is available through troweprice.com.

T. Rowe Price Blue Chip Growth Fund, Inc. | Investor Class

Risk/Return:

rr_RiskReturnAbstract

Maximum account fee

rr_MaximumAccountFee

$ 20

^[1]

Management fees

rr_ManagementFeesOverAssets

0.55%

Distribution and service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

Other expenses

rr_OtherExpensesOverAssets

0.14%

Total annual fund operating expenses

rr_ExpensesOverAssets

0.69%

1 year

rr_ExpenseExampleYear01

$ 70

3 years

rr_ExpenseExampleYear03

221

5 years

rr_ExpenseExampleYear05

384

10 years

rr_ExpenseExampleYear10

$ 859

2010

rr_AnnualReturn2010

16.42%

2011

rr_AnnualReturn2011

1.50%

2012

rr_AnnualReturn2012

18.41%

2013

rr_AnnualReturn2013

41.57%

2014

rr_AnnualReturn2014

9.28%

2015

rr_AnnualReturn2015

11.15%

2016

rr_AnnualReturn2016

0.98%

2017

rr_AnnualReturn2017

36.55%

2018

rr_AnnualReturn2018

2.01%

2019

rr_AnnualReturn2019

29.97%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Best Quarter

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Mar. 31, 2012

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

18.76%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Worst Quarter

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2018

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(14.22%)

1 Year

rr_AverageAnnualReturnYear01

29.97%

5 Years

rr_AverageAnnualReturnYear05

15.24%

10 Years

rr_AverageAnnualReturnYear10

15.97%

Since inception

rr_AverageAnnualReturnSinceInception

Inception date

rr_AverageAnnualReturnInceptionDate

Jun. 30, 1993

T. Rowe Price Blue Chip Growth Fund, Inc. | I Class

Risk/Return:

rr_RiskReturnAbstract

Maximum account fee

rr_MaximumAccountFee

Management fees

rr_ManagementFeesOverAssets

0.55%

Distribution and service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

Other expenses

rr_OtherExpensesOverAssets

0.01%

Total annual fund operating expenses

rr_ExpensesOverAssets

0.56%

1 year

rr_ExpenseExampleYear01

$ 57

3 years

rr_ExpenseExampleYear03

179

5 years

rr_ExpenseExampleYear05

313

10 years

rr_ExpenseExampleYear10

$ 701

1 Year

rr_AverageAnnualReturnYear01

30.13%

5 Years

rr_AverageAnnualReturnYear05

10 Years

rr_AverageAnnualReturnYear10

Since inception

rr_AverageAnnualReturnSinceInception

16.25%

Inception date

rr_AverageAnnualReturnInceptionDate

Dec. 17, 2015

T. Rowe Price Blue Chip Growth Fund, Inc. | Advisor Class

Risk/Return:

rr_RiskReturnAbstract

Maximum account fee

rr_MaximumAccountFee

Management fees

rr_ManagementFeesOverAssets

0.55%

Distribution and service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

0.25%

Other expenses

rr_OtherExpensesOverAssets

0.16%

Total annual fund operating expenses

rr_ExpensesOverAssets

0.96%

1 year

rr_ExpenseExampleYear01

$ 98

3 years

rr_ExpenseExampleYear03

306

5 years

rr_ExpenseExampleYear05

531

10 years

rr_ExpenseExampleYear10

$ 1,178

1 Year

rr_AverageAnnualReturnYear01

29.62%

5 Years

rr_AverageAnnualReturnYear05

14.92%

10 Years

rr_AverageAnnualReturnYear10

15.67%

Since inception

rr_AverageAnnualReturnSinceInception

Inception date

rr_AverageAnnualReturnInceptionDate

Mar. 31, 2000

T. Rowe Price Blue Chip Growth Fund, Inc. | R Class

Risk/Return:

rr_RiskReturnAbstract

Maximum account fee

rr_MaximumAccountFee

Management fees

rr_ManagementFeesOverAssets

0.55%

Distribution and service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

0.50%

Other expenses

rr_OtherExpensesOverAssets

0.17%

Total annual fund operating expenses

rr_ExpensesOverAssets

1.22%

1 year

rr_ExpenseExampleYear01

$ 124

3 years

rr_ExpenseExampleYear03

387

5 years

rr_ExpenseExampleYear05

670

10 years

rr_ExpenseExampleYear10

$ 1,477

1 Year

rr_AverageAnnualReturnYear01

29.28%

5 Years

rr_AverageAnnualReturnYear05

14.63%

10 Years

rr_AverageAnnualReturnYear10

15.37%

Since inception

rr_AverageAnnualReturnSinceInception

Inception date

rr_AverageAnnualReturnInceptionDate

Sep. 30, 2002

T. Rowe Price Blue Chip Growth Fund, Inc. | Returns after taxes on distributions | Investor Class

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

29.86%

5 Years

rr_AverageAnnualReturnYear05

14.72%

10 Years

rr_AverageAnnualReturnYear10

15.57%

Since inception

rr_AverageAnnualReturnSinceInception

Inception date

rr_AverageAnnualReturnInceptionDate

Jun. 30, 1993

T. Rowe Price Blue Chip Growth Fund, Inc. | Returns after taxes on distributions and sale of fund shares | Investor Class

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

17.82%

5 Years

rr_AverageAnnualReturnYear05

12.17%

10 Years

rr_AverageAnnualReturnYear10

13.50%

Since inception

rr_AverageAnnualReturnSinceInception

Inception date

rr_AverageAnnualReturnInceptionDate

Jun. 30, 1993

T. Rowe Price Blue Chip Growth Fund, Inc. | S&P 500 Index (reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

31.49%

5 Years

rr_AverageAnnualReturnYear05

11.70%

10 Years

rr_AverageAnnualReturnYear10

13.56%

Since inception

rr_AverageAnnualReturnSinceInception

14.33%

^[2]

Inception date

rr_AverageAnnualReturnInceptionDate

Dec. 17, 2015

T. Rowe Price Blue Chip Growth Fund, Inc. | Lipper Large-Cap Growth Funds Index

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

33.56%

5 Years

rr_AverageAnnualReturnYear05

13.23%

10 Years

rr_AverageAnnualReturnYear10

13.67%

Since inception

rr_AverageAnnualReturnSinceInception

15.06%

^[2]

Inception date

rr_AverageAnnualReturnInceptionDate

Dec. 17, 2015

[1] Subject to certain exceptions, accounts with a balance of less than $10,000 are charged an annual $20 fee.

[2] Return since 12/17/15.

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	T. Rowe Price Blue Chip Growth Fund, Inc.
Prospectus Date	rr_ProspectusDate	May 01, 2020
Document Creation Date	dei_DocumentCreationDate	Apr. 28, 2020

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Document Type	dei_DocumentType	485BPOS
Document Period End Date	dei_DocumentPeriodEndDate	Dec. 31, 2019
Registrant Name	dei_EntityRegistrantName	T. Rowe Price Blue Chip Growth Fund, Inc.
Central Index Key	dei_EntityCentralIndexKey	0000902259
Amendment Flag	dei_AmendmentFlag	false
Document Creation Date	dei_DocumentCreationDate	Apr. 28, 2020
Document Effective Date	dei_DocumentEffectiveDate	May 01, 2020
Prospectus Date	rr_ProspectusDate	May 01, 2020
Entity Inv Company Type	dei_EntityInvCompanyType	N-1A