Carbon Dioxide Emissions Calculator

This carbon dioxide emission calculator will help you gain an approximate idea of how many tons of carbon dioxide some of your activities generate and how many trees it would take to offset those emissions.

Calculator usage instructions


Total Tons of CO2 annually

Small car
(40 mpg fuel economy)

miles per month

Average/medium car
(21 mpg fuel economy)

miles per month

SUV/4 wheel drive
(15 mpg fuel economy)

miles per month

Electricity usage


Natural/propane gas 

cubic feet/month

Fuel oil heating 

gallons per month
Air Travel 

miles per month
Train Travel 

miles per month
General food & waste - how many people in your household?

no. of people


How many people in your household have meat in their diet?

no. of people

Total annual emissions

Total monthly emissions tons
No. of trees to offset
per year


No. of trees to offset
per month



Notes on CO2 emissions/offset calculator: 

The calculator is not designed to be 100% accurate as there are too many variables required in order to give a reliable emissions total. It is simply to give you an indication on how much carbon dioxide you generate and how many trees it would take to offset those emissions. 

Bear in mind that just about all we do in modern life produces a carbon footprint, well over and above what occurs in the natural world. For instance, the computer you are viewing this on was produced using processes that create carbon emissions.  Offsetting should be seen as a last resort; reduction in consumption is the first line of defense against global warming. 

The calculations are based on the following:

1 Source: Sightline Institute
2 Source: Trees for the Future 
3 Source: Various studies from around the world; averaged 
4 Source: Diet, Energy and Global Warming - Gidon Eshel and Pamela Martin. University of Chicago study, May 2006
5,6,7 Source: USA Environmental Protection Agency
8 Source: Livestock's Long Shadow - Food and Agricultural Organization Of The United Nations 2006