Diet Carbon Footprint Calculator
Estimate the annual greenhouse gas emissions of your diet and see what switching would save.
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Calculators & data tools
Numbers beat opinions. Each tool below 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.
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Protein Swap Comparison
Compare the climate cost of protein sources per 100 g of protein and price a swap over a year.
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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.