Measure what your carbon actually costs.
Eight free calculators turn flights, drives, websites, households, and business operations into one honest number: CO2 equivalent. See where your emissions come from before you try to cut them.
Built for accuracy, not guesswork.
Every calculator uses recognized emission factors and is built to run instantly in your browser, with no account and no data stored.
Standards-based factors
Each estimate draws on established emission-factor data, so figures line up with what auditors and researchers expect.
Instant, browser-based
No installs, no waiting on a server queue. Enter your numbers and get a CO2e result in seconds.
Private by design
Your inputs stay in your browser session. Nothing is sold, shared, or used to build a profile of you.
A carbon footprint is a paper trail for carbon.
Every flight booked, mile driven, page loaded, and product shipped leaves a trace of greenhouse gas behind it, most of it invisible until someone bothers to add it up. That's the quiet value of a carbon calculator: it turns an abstract worry into a specific figure you can act on, whether that means picking a lower-emission route, right-sizing a data center, or reporting Scope 3 numbers for a business. None of these tools claim to be a perfect model of the atmosphere. They're a starting point, built to be transparent about the assumptions behind every kilogram of CO2e they report, so the number in front of you means something the next time you decide how to travel, build, or buy.
8 free carbon footprint calculators.
Pick the calculator that matches what you're trying to measure.
Flight Carbon Calculator
Estimate CO2e emissions for a flight route based on distance, cabin class, and passenger count.
Open tool →Car CO2 Calculator
Work out driving emissions from distance, fuel type, and vehicle efficiency in a few fields.
Open tool →Website Carbon Calculator
Check the estimated CO2 emitted per page view based on data transfer and hosting energy mix.
Open tool →Global Emission Tracker
See how everyday activities compare against global average emission benchmarks by country.
Open tool →Household CO2 Calculator
Add up electricity, heating, water, and waste to estimate your home's yearly carbon output.
Open tool →Plastic Footprint Calculator
Translate plastic packaging and product use into an equivalent CO2 emissions estimate.
Open tool →Business Carbon Calculator
Roll up energy, travel, and operations data into an organization-level emissions estimate.
Open tool →Greenhouse Gas Emissions Calculator
Convert methane, nitrous oxide, and other gases into a single CO2-equivalent figure.
Open tool →