Learn / Free Calculators
Two calculators, free to use, for anyone who is curious.
These are not our products — they are personal-scale tools we built because the questions are interesting and most of the answers online are wrong. Everything runs in your browser. No sign-up, nothing stored.
6 steps
Personal Carbon Calculator
Home energy, travel, flights, food and the things you buy. Ends by ranking your own categories, so you find out which three actually matter and which are rounding.
Open the calculator →22 countries
EV Carbon Calculator
An electric car starts 4.1 tonnes behind on manufacturing alone, then earns it back mile by mile. Find where the two lines cross for your grid, your mileage and your assumptions.
Open the calculator →A note on what these are
Personal footprint tools run on spend and national averages. They are directionally useful and genuinely interesting, but they are not what we sell. The work we do for organisations uses measured activity data, audited factors, and methods that hold up under scrutiny — a different discipline entirely.
If you want to see how we approach the serious version, our software is a better place to look.