Carbon Footprint Calculator
Calculate annual personal greenhouse gas emissions (CO2e tonnes) across home energy, driving, flights, and diet with actionable offset recommendations.
1. Your Household & Lifestyle Profile
Home Energy
Daily Commuting & Travel
Annual Air Travel
Diet & Spending
2. Your Annual Carbon Footprint
Near UK Average • 3.4x Paris 2030 Climate Goal
Global & Climate Benchmark Comparison
Breakdown by Source
Mature trees required to absorb your annual emissions output (avg. 22 kg CO2 per tree/year).
Highest Impact Reduction Opportunities
- Replace 1 flight: Taking a train instead of one medium flight avoids ~0.5 tonnes CO2.
- Reduce meat days: Shifting 2 days a week to vegetarian saves ~0.35 tonnes CO2 annually.
- Smart thermostat & insulation: Turning down heating 1°C saves ~0.3 tonnes CO2.
About this tool
How to use it
- Enter your household size and primary heating source (gas, oil, heat pump, electric).
- Specify your weekly commuting mileage and personal vehicle fuel type (petrol, diesel, hybrid, electric).
- Input your approximate annual flight counts (short flights under 3 hours vs long intercontinental flights).
- Select your dietary habit and general consumer goods purchasing intensity.
- Review your total annual CO2e output benchmarked against Paris 2030 targets and country averages.
Why it matters
Individual greenhouse gas emissions drive global climate change, yet most people have no quantifiable measure of where their footprint originates. Understanding the relative weight of home heating, aviation, driving, and diet reveals that a few targeted lifestyle adjustments (such as avoiding one flight or reducing red meat) deliver far greater impact than minor recycling tweaks.
When to use it
Calculate annually to track year-over-year emissions reductions, before planning major travel, or when evaluating home energy upgrades (like heat pumps or solar arrays).
Good to know
Calculations use emission factors published by the UK Department for Energy Security and Net Zero (DESNZ) and the US EPA, measuring carbon dioxide equivalent (CO2e) including methane and nitrous oxide.
Common questions
What is CO2e?
CO2e stands for 'Carbon Dioxide Equivalent'. It is a standardized metric that measures the global warming potential of all greenhouse gases (including methane, nitrous oxide, and refrigerants) expressed as the equivalent amount of carbon dioxide.
What is the Paris Agreement per-capita target?
To limit global warming to 1.5°C above pre-industrial levels, global per-capita emissions must fall to approximately 2.0 to 2.5 tonnes of CO2e per person per year by 2030.
How many trees absorb 1 tonne of CO2?
A mature tree absorbs approximately 22 kg (0.022 tonnes) of CO2 per year. Therefore, offsetting 1 metric tonne of CO2e requires approximately 45 mature growing trees over one calendar year.
What is the single biggest contributor to most personal carbon footprints?
For most households in industrialized nations, private car commuting, aviation, and home heating (natural gas/oil) account for over 70% of total personal emissions.