Online Carbon Calculators

US EPA Greenhouse Gas Equivalencies Calculator

 US EPA Household Emissions Calculator

The Berkeley Institute of the Environment, UC Berkeley                 
Conservation International      
Carbon Footprint Ltd
The Nature Conservancy
Conservation Fund
ClearSky Climate Solutions, LLC
The Carbon Fund    
  Greenhouse Gas Data

U.S. Greenhouse Gas Inventory Report - 2009

United Nations - Greenhouse Gas Inventory Data
United Nations - National Inventory Submissions 2006