Quarterly report [Sections 13 or 15(d)]

Cover

v3.25.1
Cover - shares
3 Months Ended
Mar. 31, 2025
May 07, 2025
Cover [Abstract]    
Amendment Flag false  
Document Fiscal Year Focus 2025  
Document Fiscal Period Focus Q1  
Current Fiscal Year End Date --12-31  
Entity Central Index Key 0001590418  
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Mar. 31, 2025  
Document Transition Report false  
Entity File Number 000-40770  
Entity Registrant Name FOCUS UNIVERSAL INC.  
Entity Incorporation, State or Country Code NV  
Entity Tax Identification Number 46-3355876  
Entity Address, Address Line One 2311 E. Locust Court  
Entity Address, City or Town Ontario  
Entity Address, State or Province CA  
Entity Address, Postal Zip Code 91761  
City Area Code 626  
Local Phone Number 272-3883  
Title of 12(b) Security Common Stock, $0.001 par value  
Trading Symbol FCUV  
Security Exchange Name NASDAQ  
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   7,124,013