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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.

• Enter the appropriate figures into the quantity column - all fields are optional. If you usually work in metric, there's also a handy conversion feature below.
• The number of tons of CO2 emissions will be displayed in the right hand column.
• At the bottom of the form, the total estimated amount of carbon dioxide emissions will be displayed as an annual and monthly figure in short tons (1 short ton = 2000 pounds).
• Below the emissions figures will be the estimated number of trees needed to offset those emissions both annually and monthly.
• Explanatory notes are below the calculator as to how those figures were obtained.

Need to convert from metric? 
Click here for handy pop-up converter.

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. 

Unlike many calculators available on the web, I thought I'd let people know how these figures are arrived at in my script. The calculations are based on the following:

• Household electricity is based on a figure of 1.5 pounds of carbon emissions per kilowatt hour generated by a coal fired power station.³ Averages for USA based on Department of Energy, for Canada, the Ontario Ministry for Energy; for the UK, UK Environment Watch and for Australia, various state government environmental departments (averaged)
  USA - average 888 kwh per month
  Canada - average 750 kwh per month
  UK - average 270 kw per month
  Australia - 660 kwh per month  
• Natural gas emissions calculated on 0.12 pounds of carbon dioxide per cubic foot.⁵  
• Fuel oil based on 22.29 pounds CO2 emissions per gallon.⁵  
• Small car emissions calculated on .59 pounds emissions per passenger, per mile¹  
• Medium car emissions calculations based on 1.1 pounds of carbon dioxide emissions per mile¹  
• SUV/4 wheel drive carbon dioxide emissions based on 1.57 pounds per mile¹  
• Air travel emissions based on Boeing 747 at average USA capacity and calculated per person¹
• Train travel calculations based on average occupancy of intercity train.¹  
• Tree offset calculation is based on a tree planted in the humid tropics absorbing on average 50 pounds (22 kg) of carbon dioxide annually over 40 years²  - each tree will absorb 1 ton of CO2 over its lifetime; but as trees grow, they compete for resources and some may die or be destroyed - not all will achieve their full carbon sequestration potential. This calculator assumes that 5 trees should be planted to ensure that at least one lives to 40 years or that their combined sequestration equals 1 ton.  
• General waste is based on the USA average⁵ carbon dioxide emission equivalent of 1010 pounds per person per year. Please note, if your household recycles all glass, paper, plastic and cans; this aspect of the calculation could be as much as 50% less. The food aspect of the calculation is based on a vegan diet; i.e being 1.5 tons per person less than the American average of 5,600 pounds of CO2 equivalent emissions per year⁸.  
• Based on the average American diet generating the equivalent of 1.5 tons more carbon dioxide per year than a vegan diet.⁴