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

158 calculators · 142 converters · quick tools

158 live

Calculators

Full models. Enter your activity data and get a complete, reportable footprint you can cite — from personal to corporate Scope 3.

Explore all 158 calculators

Growing

Quick Tools

Single-purpose tools. Estimate, check, or compare emissions in seconds — one job, one answer, no long form. More shipping soon.

SBTi Readiness Checklist

Check your SBTi readiness

142 live

Converters

Unit and factor conversions. Turn one value into another instantly, using the same GWP set and factors as the calculators.

Convert kg CO₂ to tonnes

Which 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.