Annual report pursuant to Section 13 and 15(d)

Document and Entity Information

Document and Entity Information - USD ($)
12 Months Ended
Dec. 31, 2018
Mar. 08, 2019
Document And Entity Information    
Entity Registrant Name FOCUS UNIVERSAL INC.  
Entity Central Index Key 0001590418  
Document Type 10-K  
Document Period End Date Dec. 31, 2018  
Amendment Flag false  
Current Fiscal Year End Date --12-31  
Is Entity a Well-known Seasoned Issuer? No  
Is Entity a Voluntary Filer? No  
Is Entity's Reporting Status Current? Yes  
Entity Filer Category Non-accelerated Filer  
Entity Emerging Growth Company true  
Entity Small Business true  
Entity Ex Transition Period false  
Entity Shell Company false  
Entity Public Float   $ 302,733,238
Entity Common Stock, Shares Outstanding   40,907,101
Document Fiscal Period Focus FY  
Document Fiscal Year Focus 2018