Carbon Footprint Calculator
Estimate your annual carbon footprint from energy, transport, and diet. Compare with national averages and get a personalized reduction plan — free, private, instant.
Your Lifestyle
Your Carbon Footprint
tonnes CO₂e per year
Understanding Carbon Footprints
How This Carbon Footprint Calculator Works
This calculator estimates your annual greenhouse gas emissions (in tonnes of CO₂ equivalent) across four categories: home energy, transportation, diet, and general consumption. All calculations run entirely in your browser — no data is sent to any server.
Home Energy Emissions
Electricity emissions depend on your country's energy grid. A kilowatt-hour in France (mostly nuclear) produces far less CO₂ than one in Australia (mostly coal). We use country-specific grid emission factors from the IEA. Natural gas emits approximately 5.3 kg CO₂ per therm regardless of location.
Transportation Emissions
Driving emissions are calculated from your weekly distance, scaled annually, using fuel-specific emission factors: gasoline cars average 0.21 kg CO₂/km, diesel 0.24 kg/km, hybrids 0.12 kg/km, and electric vehicles use your country's grid factor at ~0.18 kWh/km. Flights use per-passenger-km emission factors: short-haul ~0.255 kg CO₂/km (1,500 km round trip average) and long-haul ~0.195 kg CO₂/km (8,000 km round trip average).
Diet Emissions
Food is a major contributor. A heavy meat diet produces roughly 3.3 tonnes CO₂e per year while a vegan diet produces about 1.1 tonnes. The difference comes mainly from methane from livestock, feed production, and land use change.
How to Reduce Your Carbon Footprint
The most impactful actions depend on your personal profile. Common high-impact changes include:
- Switch to renewable energy — can cut home energy emissions by 80%+
- Reduce flying — one transatlantic round trip adds ~1.6 tonnes
- Drive less or go electric — saves 2+ tonnes/year for average drivers
- Shift toward plant-based meals — even 2–3 meatless days/week helps
What Is a Carbon Footprint?
A carbon footprint is the total greenhouse gas emissions caused directly and indirectly by a person, expressed in tonnes of carbon dioxide equivalent (CO₂e). It includes CO₂, methane, nitrous oxide, and other gases weighted by their warming potential.
Frequently Asked Questions
What is a good carbon footprint?
To limit global warming to 1.5°C, the average person needs to emit below 2.0 tonnes CO₂e by 2050. Currently the global average is 4.7 tonnes and the US average is 14.7 tonnes.
Are carbon footprint calculators accurate?
They provide useful estimates, not exact measurements. This calculator uses peer-reviewed emission factors and country-specific data. The main value is understanding your largest emission sources so you can prioritize reductions.
What about things I can't control?
Personal footprint calculators cover direct and some indirect emissions. Infrastructure, public services, and industrial emissions are not included — those require systemic change through policy and collective action.
How often should I recalculate?
Recalculate after major lifestyle changes: moving house, changing commute, switching diet, or upgrading heating. An annual check helps track progress toward your reduction goals.