How We Calculate Your Offset

Here's an example of how we calculate the emissions associated with a gasoline purchase and the cost to offset them:

  
      Step
      Example
      Source
      
      Gas Purchased
      $63.80
      Credit card charge
(via Plaid)
      
      Average gas price
      $4.13
      Current average in state of residence or purchase

(via U.S. Energy Information Administration)
      
      Est. Gallons Purchased
      15.4
      = $63.80 gas purchase / ($4.13/gallon)
Credit card charge / dollars per gallon
      
      Estimated Emissions
(CO2)
      137 kg
      = 15.4 gallons * 8.887 kg/gallon
(via U.S. Environmental Protection Agency)
      
      Cost to offset
      $3.54
      = 15.4 gal. * $0.23/gal.
      
      Offset cost as of
 % gas purchase
      5.5%
      = $3.54/$63.80

OffsetC currently charges $0.23 per estimated gallon to offset the associated emissions.
This rate includes the cost of the carbon credits and OffsetC's costs for providing the service.