Air Travel Calculators
There are many airtravel calculators available online. We do not evaluate these on this website. (For a comparison of three calculators, see our paper Carbon Offsetting & Air Travel Part 1: CO2-Emissions Calculations (pdf))
When you use an online calculator, check what background information the calculator gives on the assumption and parameters that have been taken into account.
Many calculators account for CO2 emissions only and do not include non-CO2 warming effects. Some calculators give you a choice of including a multiplier for non-CO2 effects or not.