How does the Sustainable Diet Score work?

Beef: approx 60kg CO2/kg; chicken: approx 6kg CO2/kg; lentils: approx 0.9kg CO2/kg Then: Eating seasonally from local sources reduces transport and storage emissions Then: Food waste doubles the effective carbon footprint of the food that is wasted.

Can you give an example of how to use the Sustainable Diet Score?

Example: Input 4 meat servings/week, 3 plant-based meals/week, 30% local food, 15% waste gives a result of Score 52/100 - moderate sustainability; reducing beef would have the largest single impact.

Is the Sustainable Diet Score free to use?

Yes — completely free with no registration, download, or subscription required. All calculations happen instantly in your browser.

How accurate is the Sustainable Diet Score?

Our Sustainable Diet Score uses verified mathematical formulas and is accurate to multiple decimal places. Results are calculated in real-time using the same methods used by professionals.

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Sustainable Diet Score

Meat servings/week

Plant-based meals/week

Local food (%)

Food waste (%)

A sustainable diet minimises environmental impact while meeting nutritional needs. Plant-rich diets consistently score best; beef and lamb have the highest environmental footprint per calorie.

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Pro Tip

Switching from beef to chicken or fish cuts the carbon footprint of that meal by approx 70-80% without eliminating meat from your diet entirely.

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Did You Know?

A vegan diet produces approximately 2.5 tonnes of CO2 equivalent per year; an omnivorous diet with regular red meat can produce 4-6 tonnes from food alone.

References

›EAT-Lancet Commission
›Food and climate — Our World in Data

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