Diet Carbon Footprint Calculator
Estimate the annual greenhouse gas emissions of your diet and see what switching would save.
Open tool →Calculators & data tools
Numbers beat opinions. Each tool runs entirely in your browser on figures taken from peer-reviewed research, with every assumption written out so you can check the arithmetic yourself.
Animals Spared Calculator
Turn weekly servings into an estimate of how many animals a year your food choices involve.
Open tool →Protein Swap Comparison
Compare the climate cost of protein sources per 100 g of protein and price a swap over a year.
Open tool →Quick answers
- Diet Carbon Footprint Calculator
- A high-meat diet is associated with roughly 2.6 tonnes of CO2-equivalent per year from food, against about 1.1 tonnes for a vegan diet — a difference of around 60%.
- Animals Spared Calculator
- A typical omnivorous diet in a high-income country involves roughly 25 to 30 land animals a year — the overwhelming majority of them chickens — plus a larger and less certain number of fish.
- Protein Swap Comparison
- Per 100 g of protein, beef averages about 50 kg CO2-equivalent while tofu averages about 2 kg and pulses about 0.8 kg — a difference of roughly 25 to 60 times.
Estimates, not personal measurements
Calculators use published averages and simplified assumptions. Results describe possible differences, not your precise footprint or an exact count of animals spared. Check each tool’s method, units and sources before comparing results.
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