Carbon Footprint Calculator
Free online carbon footprint calculator. Compare against the global average and the Paris Agreement target.
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What is Carbon Footprint Calculator?
The Carbon Footprint Calculator estimates your personal annual CO2 equivalent emissions from three major lifestyle areas: transportation, home energy use, and diet. It uses built-in emission factors and runs entirely in your browser.
Key Benefits
- Identify which part of your lifestyle contributes most to your emissions
- Compare your footprint against global averages and climate targets
- See how switching vehicles, energy sources, or diet could reduce emissions
- Get a tangible offset estimate in number of trees
- No sign-up or data upload — everything stays on your device
Common Use Cases
- •Individuals tracking their progress toward a lower-carbon lifestyle
- •Sustainability officers building awareness materials for teams
- •Educators teaching climate science and personal impact
- •Households comparing footprints to plan reductions together
- •Companies running internal carbon-awareness campaigns
How to Use the Carbon Footprint Calculator
- Enter Your Transport: Fill in your annual distances for car, bus, and train travel, plus your yearly flight hours. Choose your car fuel type (petrol, diesel, hybrid, or electric) for accurate emission factors. Toggle between kilometers and miles as needed.
- Enter Your Home Energy: Input your average monthly electricity consumption in kWh and your monthly natural gas usage in kWh. The calculator multiplies by 12 to get annual figures and applies standard grid emission factors.
- Select Your Diet Type: Choose the diet that best matches your eating habits: meat-heavy (daily meat), average (some meat), vegetarian, or vegan. Diet choices can change your annual footprint by up to 50%.
- Read and Compare: Your total annual footprint appears in tonnes CO2e, with a breakdown bar chart by category. The colored scale compares you against the global average (4.7 t) and the Paris Agreement target (2 t). Click Copy to save the full report.
Key Features
- Three-category breakdown: transport, home energy, and diet
- Vehicle-specific emission factors for petrol, diesel, hybrid, and electric cars
- Switch between kilometers and miles for distance inputs
- Visual comparison against the global average and the Paris Agreement target
- Estimates the number of trees needed to offset your annual emissions
- Flight emissions split into short-haul and long-haul factors
Frequently Asked Questions
What emission factors does this calculator use?
It uses standard published CO2e emission factors per kilometer for transport (e.g. 0.192 kg/km for petrol cars, 0.041 kg/km for trains, 0.255 kg/km for short-haul flights), per kWh for home energy (0.385 for grid electricity, 0.184 for natural gas), and per day for diet (3.3 for meat-heavy down to 1.5 for vegan). All factors are built into the tool and no external data is fetched.
How accurate is the estimate?
The estimate is a simplified approximation designed for awareness, not precise accounting. Real-world emissions vary by vehicle efficiency, local grid mix, flight routing, and food sourcing. Use the result to identify your largest emission sources and track relative changes over time.
What is the Paris Agreement target and why 2 tonnes?
The Paris Agreement aims to limit global warming to well below 2 degrees Celsius. Studies estimate that to meet this goal, the average personal carbon footprint needs to drop to around 2 tonnes of CO2e per year by 2050. The global average today is about 4.7 tonnes.
How is the tree offset number calculated?
A mature tree absorbs approximately 21 kg of CO2 per year. The calculator divides your total annual emissions (in kg) by 21 to estimate how many mature trees would be needed to absorb that amount over one year. This is a simplified offset estimate.