CERTIFICATIONS

                          EX-99.CERT

I, Jonathan S. Thomas, certify that:

1.	I have reviewed this report on Form N-CSR of American Century Capital Portfolios, Inc.;
2.	Based on my knowledge, this report does not contain any untrue statement of a material fact or
	omit to state a material fact necessary to make the statements made, in light of the circumstances
	under which such statements were made, not misleading with respect to the period covered by
	this report;
3.	Based on my knowledge, the financial statements, and other financial information included in this
	report, fairly present in all material respects the financial condition, results of operations, changes
	in net assets, and cash flows (if the financial statements are required to include a statement of
	cash flows) of the registrant as of, and for, the periods presented in this report;
4.	The registrant's other certifying officer and I are responsible for establishing and maintaining
	disclosure controls and procedures (as defined in Rule 30a-3(c) under the Investment Company
	Act of 1940) and internal control over financial reporting (as defined in Rule 30a-3(d) under the
	Investment Company Act of 1940) for the registrant and have:
	(a)	Designed such disclosure controls and procedures, or caused such disclosure controls and
		procedures to be designed under our supervision, to ensure that material information
		relating to the registrant, including its consolidated subsidiaries, is made known to us by
		others within those entities, particularly during the period in which this report is being
		prepared;
	(b)	Designed such internal control over financial reporting, or caused such internal control
		over financial reporting to be designed under our supervision, to provide reasonable
		assurance regarding the reliability of financial reporting and the preparation of financial
		statements for external purposes in accordance with generally accepted accounting
		principles;
	(c)	Evaluated the effectiveness of the registrant's disclosure controls and procedures and
		presented in this report our conclusions about the effectiveness of the disclosure controls
		and procedures, as of a date within 90 days prior to the filing date of this report based on
		such evaluation; and
	(d)	Disclosed in this report any change in the registrant's internal control over financial
		reporting that occurred during the second fiscal quarter of the period covered by this
		report that has materially affected, or is reasonably likely to materially affect, the
		registrant's internal control over financial reporting; and
5.	The registrant's other certifying officer and I have disclosed to the registrant's auditors and the
	audit committee of the registrant's board of directors (or persons performing the equivalent
	functions):
	(a)	All significant deficiencies and material weaknesses in the design or operation of internal
		control over financial reporting which are reasonably likely to adversely affect the
		registrant's ability to record, process, summarize, and report financial information; and
	(b)	Any fraud, whether or not material, that involves management or other employees who
		have a significant role in the registrant's internal control over financial reporting.

Date:  November 27, 2009 

/s/ Jonathan S. Thomas 

Jonathan S. Thomas 

President 

(principal executive officer) 

I, Robert J. Leach, certify that:

1.	I have reviewed this report on Form N-CSR of American Century Capital Portfolios, Inc.;
2.	Based on my knowledge, this report does not contain any untrue statement of a material fact or
	omit to state a material fact necessary to make the statements made, in light of the circumstances
	under which such statements were made, not misleading with respect to the period covered by
	this report;
3.	Based on my knowledge, the financial statements, and other financial information included in this
	report, fairly present in all material respects the financial condition, results of operations, changes
	in net assets, and cash flows (if the financial statements are required to include a statement of
	cash flows) of the registrant as of, and for, the periods presented in this report;
4.	The registrant's other certifying officer and I are responsible for establishing and maintaining
	disclosure controls and procedures (as defined in Rule 30a-3(c) under the Investment Company
	Act of 1940) and internal control over financial reporting (as defined in Rule 30a-3(d) under the
	Investment Company Act of 1940) for the registrant and have:
	(a)	Designed such disclosure controls and procedures, or caused such disclosure controls and
		procedures to be designed under our supervision, to ensure that material information
		relating to the registrant, including its consolidated subsidiaries, is made known to us by
		others within those entities, particularly during the period in which this report is being
		prepared;
	(b)	Designed such internal control over financial reporting, or caused such internal control
		over financial reporting to be designed under our supervision, to provide reasonable
		assurance regarding the reliability of financial reporting and the preparation of financial
		statements for external purposes in accordance with generally accepted accounting
		principles;
	(c)	Evaluated the effectiveness of the registrant's disclosure controls and procedures and
		presented in this report our conclusions about the effectiveness of the disclosure controls
		and procedures, as of a date within 90 days prior to the filing date of this report based on
		such evaluation; and
	(d)	Disclosed in this report any change in the registrant's internal control over financial
		reporting that occurred during the second fiscal quarter of the period covered by this
		report that has materially affected, or is reasonably likely to materially affect, the
		registrant's internal control over financial reporting; and
5.	The registrant's other certifying officer and I have disclosed to the registrant's auditors and the
	audit committee of the registrant's board of directors (or persons performing the equivalent
	functions):
	(a)	All significant deficiencies and material weaknesses in the design or operation of internal
		control over financial reporting which are reasonably likely to adversely affect the
		registrant's ability to record, process, summarize, and report financial information; and

(b)	Any fraud, whether or not material, that involves management or other employees who
	have a significant role in the registrant's internal control over financial reporting.

Date:  November 27, 2009 

/s/ Robert J. Leach 

Robert J. Leach 

Vice President, Treasurer, and 

Chief Financial Officer 

(principal financial officer)