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Carbon Footprint Calculator

Estimate your annual carbon footprint from transport, home energy, diet, and shopping. Get personalised tips to reduce your emissions.

🚗 Transport

🏠 Home Energy

1 therm ≈ 5.3 kg CO₂

🥗 Diet & Lifestyle

kg CO₂e per day

kg CO₂e per year

What is Carbon Footprint Calculator?

A carbon footprint is the total amount of greenhouse gases — primarily carbon dioxide (CO₂) and methane — produced directly and indirectly by your activities, measured in tonnes of CO₂ equivalent (tCO₂e). The global average carbon footprint is about 4 tonnes per person per year. In developed countries like the US, UK, and Australia, the average is 7–16 tonnes. This calculator estimates your footprint from the four biggest personal emission sources: transport, home energy, diet, and consumption.

How to use

  1. 1 Select your country to calibrate the electricity emission factor.
  2. 2 Enter your weekly driving distance and car type.
  3. 3 Enter your monthly flights and train travel.
  4. 4 Enter your monthly electricity and gas usage.
  5. 5 Select your diet type and shopping habits.
  6. 6 The calculator shows your estimated annual CO₂ footprint and a breakdown by category.

Formula

Transport CO₂ = Distance × Emission Factor (kg CO₂/km) Home Energy CO₂ = kWh × Grid Emission Factor Diet CO₂ = Daily emissions based on diet type × 365 Total = Sum of all categories

Example calculation

Driving 15,000 km/year in a petrol car (0.21 kg CO₂/km) = 3,150 kg. Electricity 300 kWh/month × 12 × 0.45 kg/kWh = 1,620 kg. Average diet 2.5 kg/day × 365 = 912 kg. Total ≈ 5.7 tCO₂e/year.

Frequently asked questions

What is a good carbon footprint?

To meet the Paris Agreement goal of limiting warming to 1.5°C, every person needs to average under 2.5 tonnes CO₂e per year by 2030. Most people in developed countries are at 7–16 tonnes, so significant reductions are needed across the board.

What has the biggest impact on my footprint?

Transport (especially flying and driving), home energy, and diet are typically the three largest contributors. Switching to a plant-based diet, flying less, driving an EV or switching to public transport, and using renewable energy are the highest-impact individual actions.

What does tCO₂e mean?

tCO₂e stands for tonnes of CO₂ equivalent. It converts all greenhouse gases (methane, nitrous oxide, etc.) into the equivalent amount of CO₂ that would cause the same warming effect, providing a single comparable unit.

How accurate is this calculator?

This is an estimate based on average emission factors. Actual emissions vary by specific vehicle model, appliance efficiency, local grid mix, and supply chain factors. It gives a useful directional indication, not a precise measurement.

What is carbon offsetting?

Carbon offsetting involves paying for verified projects (reforestation, renewable energy, methane capture) that reduce emissions elsewhere to compensate for your own. It is generally considered a last resort after reducing your own emissions as much as possible.