Meat Carbon Footprint Calculator

A meat carbon footprint is the total greenhouse-gas emissions caused by producing the meat you eat, expressed in kilograms of CO2 equivalent (CO2e). It covers the whole supply chain: land-use change, feed production, the animals themselves (including methane from digestion), processing, transport, retail and packaging. This calculator multiplies how much of each meat you eat by peer-reviewed average emission factors to estimate your annual total.

The core formula is simple: CO2e = amount eaten × emission factor. For each meat you enter, the calculator converts your input to kilograms per year (weekly input × 52, monthly input × 12) and multiplies it by that meat's emission factor in kg CO2e per kg — for example 60 for beef and 6 for chicken. Household mode multiplies the per-person total by the number of people. The emission factors come from Poore & Nemecek (2018), a meta-analysis of 38,000+ farms in 119 countries.

Beef averages about 60 kg of CO2e per kilogram — the highest of any common meat. Ruminants release methane as they digest grass, and beef production uses large amounts of land and feed. For context, eating just 0.5 kg of beef per week produces roughly 1,560 kg of CO2e per year, equivalent to driving over 9,000 km in a typical petrol car.

Chicken averages about 6 kg of CO2e per kilogram — roughly one-tenth of beef's footprint. Chickens don't produce methane through digestion and convert feed into meat far more efficiently than cattle. Eating 1 kg of chicken per week produces about 312 kg of CO2e per year, versus 3,120 kg for the same amount of beef.

Among the meats in this calculator, dairy (milk, ~3 kg CO2e/kg) and eggs (~4.5 kg CO2e/kg) have the lowest footprints, followed by farmed fish (~5) and chicken/turkey (~6). Pork sits in the middle (~12), while lamb (~24) and beef (~60) are far higher. Swapping ruminant meat for poultry, fish, eggs or dairy is the single most effective dietary change for cutting food emissions.

Beef's footprint is about 10 times chicken's: roughly 60 kg CO2e/kg for beef versus 6 kg CO2e/kg for chicken. Try the what-if scenario above: swapping 0.5 kg of beef per week for the same amount of chicken saves about 1,404 kg of CO2e per year — a 90% reduction for that portion of your diet. No other single food swap comes close.

Yes — significantly. Pork averages about 12 kg CO2e/kg, roughly one-fifth of beef's 60 kg. Pigs are monogastric animals, so they don't burp methane like cattle and sheep, and they convert feed more efficiently. Replacing beef with pork cuts the footprint of that meat by about 80%.

Lamb averages about 24 kg CO2e/kg because sheep are ruminants: like cattle, they release methane during digestion, and methane is a potent greenhouse gas. Lamb's footprint is lower than beef's mainly because sheep are smaller and reach slaughter weight faster, but it is still 4 times higher than chicken's.

Yes. Farmed fish (~5 kg CO2e/kg), eggs (~4.5) and dairy milk (~3) all sit well below every land meat except chicken and turkey (~6). That said, production method matters enormously for fish — some wild-caught fisheries and shrimp farming can have footprints rivalling pork or worse — so treat the fish figure as a farmed-fish average.

It varies widely. A person eating 0.5 kg of beef plus 1 kg of chicken per week produces about 1,872 kg of CO2e per year from meat alone. A heavy beef eater (1 kg of beef per week) reaches about 3,120 kg per year — comparable to driving a petrol car for over 18,000 km. Use the calculator above with your own habits to get your personal number.

The most impactful steps, in order: (1) cut beef and lamb first — they dominate most meat footprints; (2) swap ruminant meat for chicken, turkey, fish, eggs or dairy; (3) reduce portion sizes and add meat-free days; (4) waste less — thrown-away meat carries its full footprint with zero benefit. Eating one less beef burger per week saves roughly 780 kg of CO2e per year.

Not necessarily. Grass-fed cattle often grow more slowly and live longer, which can mean more lifetime methane per kilogram of meat — some studies find grass-fed beef's footprint similar to or even higher than feedlot beef. The biggest, most reliable lever is simply eating less beef, whatever the production system. This calculator uses global averages and cannot model a specific farm.

They are global averages from Poore & Nemecek (2018), which pooled data from 119 countries. Real footprints vary a lot by production system, feed, land use and region — beef can range from under 20 to over 100 kg CO2e/kg across studies. Your result is a defensible first-order estimate for comparing meats and diet choices, not a measurement of a specific farm or supply chain.

Four honest limits: (1) it uses global-average factors, not your local production; (2) it covers climate impact only — water use, land use, biodiversity and animal welfare are not included; (3) cooking, food waste and transport to your plate after retail are not modeled; (4) equivalence conversions (car km, flights, electricity days) use standard reference factors and are illustrative. See the Methodology section for full detail.

CO2e — carbon dioxide equivalent — converts all greenhouse gases into the amount of CO2 that would cause the same warming. Methane from cattle digestion and nitrous oxide from fertiliser are far more potent per kilogram than CO2, so expressing everything in CO2e lets different meats be compared on one scale. The standard 100-year global warming potentials come from the IPCC.

Yes, fully private. This calculator runs 100% in your browser — every calculation happens in JavaScript on your device. No input is sent to any server, no cookies are set by the tool, and there are no third-party trackers or external requests of any kind.