Resources
Carbon Calculators, Tools & Converters
Whatever carbon number you need — your household footprint, a company’s Scope 3, or a quick unit conversion — there’s a fast, sourced way to get it here.
Free to use · no sign-up · every factor cited & versioned
Three ways to measure carbon
Calculators
Full models. Enter your activity data and get a complete, reportable footprint you can cite — from personal to corporate Scope 3.
Explore all 143 calculatorsQuick Tools
Single-purpose tools. Estimate, check, or compare emissions in seconds — one job, one answer, no long form. More shipping soon.
Check your SBTi readinessConverters
Unit and factor conversions. Turn one value into another instantly, using the same GWP set and factors as the calculators.
Convert kg CO₂ to tonnesWhich one do you need?
| Calculators | Quick Tools | Converters | |
|---|---|---|---|
| Does | Builds a full footprint from many inputs | Answers one question | Turns one unit into another |
| Use when | You need a reportable, auditable number | You want a fast estimate or a compliance check | You have a value in the wrong unit |
| Example | Fleet Carbon Footprint | SBTi Readiness Checklist | kg CO₂ → tonnes |
| Speed | Minutes, multi-step | Seconds, single-answer | Instant |
Every number is sourced
Cited & versioned
Every calculator, tool and converter reads from GreenCalculus MasterBrain — a single, versioned library of emission factors with a source and a vintage on every value. When a factor is updated (DEFRA, IPCC, grid mixes), every page that uses it updates with it.
See the methodology, explore MasterBrain, or download the underlying datasets. Looking for standards, definitions and guides instead? Visit the Library.