Calculators

Calculators for the footprint of one lifestyle, or of the choices the whole world makes on climate. For a carbon footprint calculator, we look for a published method, a public-interest owner and data that’s kept up to date.

For your own footprint, the Ecological Footprint Calculator from the non-profit Global Footprint Network shows how many Earths your way of life needs; it fills gaps with national averages, and the site loads Google Analytics and a Facebook script. For the bigger picture, En-ROADS, a free simulator from Climate Interactive and MIT Sloan, lets you test which policies move global temperature, with new releases most months.

How we choose: each calculator is checked against the 6 principles in our manifesto: who owns it and how it makes money, what it collects, how it treats people, honesty, openness and staying power. We last checked them on 13 October 2026.