Carbon Calculators

Measure your impact. Start your climate action.

Calculating your carbon footprint is the essential first step. As the UK's original and most trusted provider, our calculators are backed by 20+ years of expertise to give you an accurate, reliable measure of your impact — whether you're an individual, a small business, or a large corporation.

Our calculators

Pick the right calculator for you.

The path to a sustainable future begins with a clear understanding of where you are today. Choose the tool that fits your scale.

Sustrax Vita

Individuals & Households

Free, no-account carbon footprint calculator for your home, travel and lifestyle.

Sustrax Lite, Lite X, Lite XL

Small & Growing Businesses

Free for micro-businesses. Scale up to Lite X or XL as your reporting needs grow.

Sustrax MX & AX

Larger Corporates

Enterprise-grade tracking platform with SECR, CSRD, supply chain & multi-site reporting.

Or use our original Classic Calculator

What's next

Your number is in. Now what?

A number is just the beginning. Credible climate action means two things — reducing what you can, and funding carbon solutions for what you can't.

Step 1 — Most impactful

Create a reduction plan.

The most impactful climate action is to reduce emissions at the source. Learn the most effective strategies for your home or business — from energy efficiency to sustainable procurement.

Step 2 — What's left

Fund carbon solutions.

For the emissions you can't yet eliminate, take responsibility by funding high-impact, verified climate projects. Every credit is rated through our CRISP platform — credible, transparent, and real.

Original tool

Our Classic Calculator

Prefer the original? We've kept the classic calculator below for those who'd rather use the legacy interface.

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Try Our New & Improved Carbon Calculator!
It's free to use and better than ever. Calculate your emissions here - Sustrax Vita