Estimate the carbon footprint of your diet based on weekly food consumption. Enter servings of meat, dairy, grains, and vegetables to see your annual food CO2 emissions.
Food production accounts for roughly 26% of global greenhouse gas emissions, making diet one of the most impactful areas for personal carbon reduction. Beef and lamb generate the highest emissions per kilogram, while plant-based foods produce a fraction of the carbon. Understanding the emissions profile of your weekly diet helps you make informed choices that benefit both health and the environment.
This Diet Carbon Footprint Calculator lets you enter your weekly consumption of beef, poultry, pork, fish, dairy, eggs, grains, and vegetables. Each food group is multiplied by its average emission factor (kg CO2 per kg of food) and scaled to an annual footprint. The result shows which food groups contribute the most to your dietary emissions.
Whether you're considering Meatless Mondays, going fully vegetarian, or simply reducing red meat, this tool quantifies the CO2 impact of each dietary shift so you can set realistic, meaningful goals.
Precise measurement of this value supports sustainable energy planning and helps organizations reduce their environmental impact while maintaining operational performance and comfort levels.
Diet changes are one of the most accessible ways to lower your carbon footprint. This calculator shows exactly how much CO2 each food category contributes, helping you target the highest-impact changes without guessing. Having accurate metrics readily available streamlines utility bill analysis, budget forecasting, and investment planning for energy efficiency projects and renewable energy installations.
Annual Food CO2 (kg) = Σ(weekly_kg × emission_factor × 52). Factors: Beef 27 kg CO2/kg, Lamb 24, Pork 7, Poultry 6, Fish 5, Dairy 3.2, Eggs 4.7, Grains 1.4, Vegetables 0.5.
Result: 2,156 kg CO2/year
Beef: 0.5×27×52 = 702 kg. Poultry: 1×6×52 = 312. Pork: 0.5×7×52 = 182. Fish: 0.3×5×52 = 78. Dairy: 3×3.2×52 = 499. Eggs: 0.5×4.7×52 = 122. Grains: 4×1.4×52 = 291. Veg: 5×0.5×52 = 130. Total ≈ 2,156 kg.
Protein source is the biggest determinant of dietary emissions. Shifting from beef to chicken, fish, or plant proteins delivers the largest CO2 savings. Even partial substitution — replacing half of your beef with legumes — can reduce food emissions by 20–30%.
About one-third of food produced globally is wasted. When food decomposes in landfills, it releases methane. Reducing food waste by meal planning, storing food properly, and composting scraps can cut your diet-related footprint by 5–15%.
Emission factors differ by country. Beef from deforestation-linked regions has a far higher footprint than beef from regenerative grazing. Likewise, dairy from grass-fed herds in temperate climates differs from feedlot dairy. Use this calculator as a directional guide and adjust based on your sourcing.
Cattle produce methane through enteric fermentation, require vast amounts of feed (which needs land and fertilizer), and involve deforestation for grazing. Combined, these factors make beef roughly 27 kg CO2-eq per kg of product.
Not necessarily. Organic farming avoids synthetic fertilizers but often requires more land for the same yield. The climate impact varies by product and farming practices. Choosing what you eat matters more than how it's produced.
A vegan diet typically produces about 1.5 tonnes of food CO2 per year, compared to roughly 2.5 tonnes for the average Western diet and 3.5+ tonnes for a heavy meat diet. This represents a 40–60% reduction.
Transport accounts for only about 5–10% of a food's total emissions. What you eat matters far more than where it comes from. However, air-freighted fresh produce (like out-of-season berries) has much higher transport emissions.
Yes, generally. Oat, soy, and almond milks produce 50–80% less CO2 than cow's milk. Almond milk uses more water but still has a lower carbon footprint. Oat milk is the best all-around environmental choice.
The factors used here are averages from life-cycle analyses and can vary by region, farming method, and season. They provide a useful approximation for comparing food groups, which is the primary purpose of this calculator.