zFacts Energy-Policy Calculator  
Try these examples:  
Energy Units   Fuels  Uses / Events
 
One  
1 Fossil-import-year (US)
has  53.73%  as much energy as
1 Fossil-production-year (US)
Energy Units   Fuels   Uses / Events
 
One  
Fossil-import-year (US)
Total US fossil imports during 2005.
Fossil-production-year (US)
Total US fossil energy produced during 2005.