Carbon Offset Calculator
Calculate the cost to offset a given carbon footprint through different verified offset programmes.
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How to use this calculator
- 1
Enter the total tonnes of CO₂ you want to offset.
- 2
Select the type of offset programme from the dropdown.
- 3
Review the cost range and quality rating for your chosen programme.
- 4
Use the recommendation to choose the best option for your needs.
Frequently asked questions
What does "additionality" mean?
Additionality means the offset would not have happened without your purchase. High-additionality projects genuinely reduce or remove carbon that would otherwise remain in the atmosphere.
Are carbon offsets worth buying?
Verified, high-quality offsets from reputable standards (Gold Standard, Verra VCS) are a useful complement to reducing your own emissions — but they should not replace reducing first.
Carbon Offset Calculator
How to use the carbon offset calculator
Use this carbon offset calculator to estimate how many tonnes of CO₂ you need to offset and the approximate cost to do so. Enter your annual emissions from flights, driving, home energy, and diet above. Results show the total carbon footprint and the offset cost at current market rates. Free and instant.
How the carbon offset calculator works
The carbon offset calculator applies IPCC and DEFRA emission factors to your lifestyle inputs to estimate your carbon footprint in tonnes of CO₂ equivalent. It then multiplies by a carbon credit price (sourced from voluntary carbon markets) to estimate the offset cost. All calculations run locally in your browser.
What is this tool?
Calculate the cost to offset your carbon footprint by comparing forestry, renewable energy, direct air capture, soil carbon, and blue carbon programmes.
How to interpret results
Lower cost per tonne is more affordable, but higher-quality verified offsets are more effective. Prioritise reducing emissions before purchasing offsets.
Learn more from an authoritative source:
WikipediaCarbon Footprint Calculator
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See the environmental savings from recycling household materials including CO₂, energy, and water.
Results are estimates for informational purposes only and do not constitute professional financial, medical, legal, or technical advice. Read full disclaimer →