v3.26.3
Cover
Apr. 17, 2026
Cover [Abstract]  
Document Type 8-K
Amendment Flag true
Amendment Description This Amendment is being filed to include Audited Financial Statements and Unaudited Proforma Combined Financial Information.
Document Period End Date Apr. 17, 2026
Entity File Number 001-40770
Entity Registrant Name FOCUS UNIVERSAL INC.
Entity Central Index Key 0001590418
Entity Tax Identification Number 46-3355876
Entity Incorporation, State or Country Code NV
Entity Address, Address Line One 901 Corporate Center Drive
Entity Address, Address Line Two Suite 404
Entity Address, City or Town Monterey Park
Entity Address, State or Province CA
Entity Address, Postal Zip Code 91754
City Area Code (626)
Local Phone Number 272-3883
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Title of 12(b) Security Common stock, $0.001 par value per share
Trading Symbol FCUV
Security Exchange Name NASDAQ
Entity Emerging Growth Company false