Cover - shares	6 Months Ended
	Jun. 30, 2021	Aug. 03, 2021
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Quarterly Report	true
Document Transition Report	false
Document Period End Date	Jun. 30, 2021
Document Fiscal Period Focus	Q2
Document Fiscal Year Focus	2021
Current Fiscal Year End Date	--12-31
Entity File Number	000-28831
Entity Registrant Name	CAPSTONE COMPANIES, INC.
Entity Central Index Key	0000814926
Entity Tax Identification Number	84-1047159
Entity Incorporation, State or Country Code	FL
Entity Address, Address Line One	431 Fairway Drive
Entity Address, Address Line Two	Suite 200
Entity Address, City or Town	Deerfield Beach
Entity Address, State or Province	FL
Entity Address, Postal Zip Code	33441
City Area Code	(954)
Local Phone Number	252-3440
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		48,893,031