How much CO₂ does beef produce per kilogram?

Beef from a beef herd produces approximately 99.5 kg of CO₂ equivalent per kilogram of retail weight, according to Poore and Nemecek (2018). Beef from a dairy herd produces around 33.3 kg CO₂e per kg. The large difference occurs because dairy herds are partly allocated to milk production, reducing the emissions attributed to beef. The beef herd figure includes land use change, enteric fermentation (methane from digestion), manure management, feed production and transport.

What is the carbon footprint of chicken vs beef?

Chicken produces approximately 9.87 kg CO₂e per kilogram of meat. Beef from a beef herd produces 99.5 kg CO₂e per kg. Replacing one kilogram of beef with an equal weight of chicken reduces CO₂ emissions by approximately 89 kg — equivalent to driving roughly 420 km in an average petrol car. The main reasons beef emits more are enteric methane from digestion and the much larger land footprint per kilogram of edible protein.

Why does beef have such a large carbon footprint?

Beef has a large carbon footprint for four main reasons. First, cattle produce methane during digestion (enteric fermentation), and methane is approximately 28 times more potent than CO₂ over a 100-year period. Second, cattle are fed large quantities of crops, requiring significant land and agricultural inputs. Third, beef production uses vast areas of land — including land cleared from forests in some regions. Fourth, cattle convert feed to edible protein less efficiently than pigs or chickens, requiring more resources per kilogram of food produced.

What is the water footprint of meat?

The water footprint of beef is approximately 15,400 litres per kilogram, meaning producing one kilogram of beef requires roughly 15,400 litres of freshwater. Pork requires about 5,988 litres per kg, chicken about 4,325 litres per kg and lentils about 1,250 litres per kg. These figures come from Mekonnen and Hoekstra's 2012 research on the global water footprint of farm animal products and include rainwater, irrigation water and water used in processing.

How does a vegan diet compare to a meat-eating diet for emissions?

According to Poore and Nemecek (2018), high meat-eaters in the UK produce approximately 7.19 kg CO₂e per day from food, while vegans produce 2.89 kg CO₂e per day — a reduction of about 60 percent. Globally, average meat-eater diets produce roughly 1,500 to 2,500 kg CO₂e per year from animal products alone, while vegan diets typically produce 400 to 600 kg CO₂e per year from all food.

What is CO₂ equivalent (CO₂e)?

CO₂ equivalent (CO₂e) is a standardised unit for measuring greenhouse gas emissions. It converts all greenhouse gases — including methane, nitrous oxide and others — into the amount of CO₂ that would have the same global warming effect over 100 years. Methane, for example, is approximately 28 times more potent than CO₂ over 100 years, so 1 kg of methane equals 28 kg CO₂e. Using CO₂e allows direct comparison of different greenhouse gases and different foods.

What is the land footprint of meat?

Lamb uses approximately 370 m² of land per kilogram of meat, making it the most land-intensive food in most life cycle assessments. Beef (beef herd) uses around 326 m² per kg, while chicken uses about 7 m² per kg and lentils about 3.4 m² per kg. Land use includes grazing land, cropland for feed and land used for processing. In regions where cattle grazing drives deforestation, the real land use change impact can be considerably higher.

Are emission factors the same worldwide?

No. Emission factors vary significantly by country, farming system and feed type. Brazilian beef produced on deforested land has a much higher footprint than European beef raised on permanent grassland. Grain-fed beef in feedlots has different land use characteristics from grass-fed beef. The emission factors used in this calculator are global median values from Poore and Nemecek (2018), derived from a meta-analysis of 570 studies covering 38,700 farms in 119 countries.

How can I reduce my meat footprint?

The most impactful dietary changes for reducing emissions are reducing beef and lamb consumption, as these have by far the highest CO₂e per kilogram. Replacing one beef meal per week with chicken reduces annual emissions by roughly 250 kg CO₂e. Replacing it with lentils saves approximately 500 kg CO₂e per year. Reducing portion sizes and minimising food waste also lower the environmental impact. The plant-swap comparison in this calculator shows the specific saving for each substitution.

Meat Footprint Calculator — Free Online Tool | LazyTools

Free Science Tool · Environmental Impact · Food Emissions

Meat Footprint Calculator

Calculate the CO₂ equivalent emissions, freshwater use and land use for any meat, dairy or plant-based food. Based on Poore & Nemecek 2018 emission factors — the most comprehensive global food life cycle assessment to date. Single food mode and full weekly diet analysis.

Select food and quantity

Food item

Quantity

How often?

📋 Emission factors from Poore & Nemecek (2018), Science — median values across 38,700 farms in 119 countries.

Annual environmental impact

— kg CO₂ equivalent per year

—Litres water / year

—m² land / year

—kg CO₂e per kg food

CO₂e per kg — where does this food sit?

🌿 Plant swap: annual CO₂e if replaced with equal weight of…

Lentils —

Tofu —

Enter how many 100g servings per week you eat of each food. Leave at 0 if you don't eat it. Results update in real time.

—kg CO₂e / year

—k Litres water / year

—m² land / year

—kg CO₂e / week

Your annual CO₂e vs diet benchmarks (protein foods)

🌍 14 foods with emission data 💧 Water footprint included 🌾 Land use included 🌿 Plant swap comparison 📊 Full diet analysis 📖 Poore & Nemecek 2018

How to Use the Meat Footprint Calculator

All results update in real time as you change inputs. Furthermore, the tool shows three metrics — CO₂ equivalent emissions, freshwater use and land use. This gives the full picture beyond carbon alone.

Single Food mode — quick lookupSelect a food from the dropdown. Furthermore, enter the quantity in grams, kilograms, ounces or pounds, and choose how often you eat that amount. The calculator converts everything to annual totals for consistent comparison. Additionally, the plant swap panel shows what your CO₂e would be if you replaced that food with an equal weight of lentils or tofu.
Read the three metricsAnnual CO₂e in kilograms is the primary metric, displayed in large text with a colour scale — red for high, amber for medium, green for low. Furthermore, the water and land metrics sit alongside it in a grid. Additionally, equivalent measures (km driven, showers, football pitches) make the abstract numbers tangible.
Check the comparison barsThe comparison chart plots your selected food alongside all other foods in the database on a common CO₂e-per-kg scale. Furthermore, this shows at a glance where your food sits — from beef (beef herd) at the top to nuts at the bottom. Additionally, you can switch foods in the dropdown and watch the bar update.
Weekly Diet mode — full protein footprintSwitch to the Weekly Diet tab. Furthermore, enter how many 100g servings per week you eat of each protein food. Additionally, the summary shows your total annual CO₂e, water and land use from all food combined. The benchmark bars compare your diet against typical meat-eater, vegetarian and vegan protein footprints.
Understand the methodologyAll emission factors are global median values from Poore & Nemecek (2018). Furthermore, water footprint values are from Mekonnen & Hoekstra (2012). Additionally, both are life cycle assessments — they include all stages from farm inputs to retail, not just direct emissions from the animal or farm.

CO₂ Emissions from Meat Production — The Data

The emission factors come from Poore & Nemecek's 2018 meta-analysis. It covered 570 studies and 38,700 farms in 119 countries. Furthermore, the study calculated the median lifecycle CO₂ equivalent emissions per kilogram of retail food for all major food types. Additionally, the values include greenhouse gases from land use change, enteric fermentation, manure management, feed production and transport.

Food	kg CO₂e per kg	Litres water per kg	m² land per kg
Beef (beef herd)	99.5	15,400	326
Lamb & mutton	39.7	10,400	370
Beef (dairy herd)	33.3	10,800	110
Shrimp (farmed)	26.9	3,572	3.0
Cheese	23.9	5,060	65
Fish (farmed)	13.6	3,691	3.7
Pork	12.3	5,988	15
Turkey	10.9	4,500	10
Chicken	9.87	4,325	7.1
Eggs	4.67	3,265	5.7
Tofu	3.16	2,350	2.2
Milk (per litre)	3.15	1,020	9.0
Lentils	1.58	1,250	3.4
Nuts	0.43	4,134	7.9

These figures are medians across a wide global range. Furthermore, actual emissions for any specific product depend heavily on where and how it was produced. Furthermore, the range within each category is enormous. The lowest-impact beef producers emit around 10 times less than the highest-impact ones.

Why Beef Has Such a Large Carbon Footprint

Beef emits far more greenhouse gas per kilogram than any other common food. Furthermore, four factors combine to create this outsized impact. Each factor is significant on its own. Together, they explain why the gap between beef and chicken is roughly tenfold.

Enteric fermentation — methane from digestion

Cattle are ruminants. Furthermore, their multi-chamber stomachs ferment grass and feed, producing methane as a byproduct. Methane is approximately 28 times more potent than CO₂ over 100 years. Additionally, a single dairy or beef cow emits 70 to 120 kg of methane per year — all from digestion alone, before any other farm inputs are counted.

Feed conversion inefficiency

Cattle convert feed to edible protein very inefficiently. Furthermore, it takes roughly 8 kg of grain or feed to produce 1 kg of beef. Pigs and chickens require 3 to 5 kg of feed per kg of meat. Additionally, this inefficiency means all the emissions and resources embedded in producing the feed are multiplied across the chain before a kilogram of beef reaches the consumer.

Land use and deforestation

Beef production uses more land per kilogram than any other food. Furthermore, cattle grazing and feed crop production drive a large share of tropical deforestation. Additionally, when forest is cleared for beef, the carbon stored in those trees is released — adding a large one-time land use change emission to the ongoing production footprint.

Manure management

Cattle produce large volumes of manure. Furthermore, manure decomposes to produce both methane and nitrous oxide — another potent greenhouse gas approximately 265 times more powerful than CO₂ over 100 years. Additionally, manure management systems (lagoons, composting, anaerobic digestion) affect how much gas is released, with significant variation between farming systems.

Pork, Chicken and Seafood — Comparing Footprints

Chicken and pork produce far fewer emissions than beef or lamb. Furthermore, both monogastric animals (pigs and chickens) convert feed to meat more efficiently and produce no enteric methane. Additionally, they require less land because they can be raised in intensive systems on relatively small footprints.

Seafood emissions vary enormously by species and production method. Furthermore, wild-caught small fish (sardines, herring, anchovies) have very low footprints — often below 2 kg CO₂e per kg. Additionally, farmed fish average around 13.6 kg CO₂e per kg globally. This reflects the energy costs of aquaculture systems and fish feed. Farmed shrimp produce approximately 26.9 kg CO₂e per kg. That is higher than chicken, partly due to land clearing for ponds and energy-intensive aeration.

Turkey has a similar footprint to chicken at around 10.9 kg CO₂e per kg. Furthermore, both are significantly more climate-friendly than pork on a per-kg basis, and dramatically lower than beef. Additionally, grass-fed beef is sometimes marketed as more sustainable but typically has a higher carbon footprint than grain-fed beef — grass-fed cattle grow more slowly and produce more methane per kilogram of meat over their longer lives.

The Water Footprint of Meat

Freshwater scarcity affects over two billion people worldwide. Furthermore, food production accounts for approximately 70 percent of global freshwater withdrawals. Additionally, meat and dairy are particularly water-intensive. They require both the water to raise animals and the water embedded in all the feed crops those animals consume.

Beef requires approximately 15,400 litres of water per kilogram — equivalent to 385 showers. Furthermore, this figure comes from Mekonnen & Hoekstra's 2012 research on the global water footprint of farm animal products. Furthermore, most is green water — rainfall absorbed by feed crops. Blue water (irrigation water from rivers and aquifers) is also significant in drought-prone regions.

Lentils require around 1,250 litres per kilogram — about one-twelfth of the beef water footprint. Furthermore, this makes legumes the clear winner on water efficiency among high-protein foods. Additionally, nuts are surprisingly water-intensive at 4,134 litres per kg. Almond and cashew farming in California and tropical regions relies heavily on irrigation.

Land Use — The Other Hidden Cost

Land is a finite resource. Furthermore, about 50 percent of the world's habitable land is used for agriculture. Approximately 77 percent of that agricultural land supports livestock, despite livestock providing only 18 percent of global calories. Additionally, reducing meat consumption could free vast land areas. These could be used for rewilding, carbon sequestration or other agricultural purposes.

Lamb and beef have the highest land footprints — 370 m² and 326 m² per kilogram respectively. Furthermore, this is largely because grazing requires extensive permanent pasture. Additionally, lentils require only 3.4 m² per kilogram and tofu around 2.2 m². That is roughly 150 times less land than lamb per kilogram of protein.

The land use figures in this calculator represent global median values. Furthermore, they include both direct grazing land and cropland used for feed production. Additionally, in regions like the Amazon Basin, where beef production drives active deforestation, the real effective land footprint is considerably higher than the global median — and includes the carbon stored in the cleared forest.

Comparing Meat with Plant-Based Proteins

Plant-based proteins have dramatically lower footprints than meat across all three metrics — CO₂e, water and land. Furthermore, lentils produce 1.58 kg CO₂e per kg, approximately 63 times less than beef from a beef herd. Furthermore, they fix atmospheric nitrogen in their root nodules. This reduces the need for synthetic nitrogen fertiliser and lowers their production footprint.

Tofu sits at 3.16 kg CO₂e per kg, similar to milk. It provides a complete protein source with all essential amino acids. Furthermore, it uses 2.2 m² of land per kilogram, compared to 326 m² for beef. Additionally, soy grown in Europe and North America has a very different land use profile from soy grown in the Amazon. Origin matters significantly for plant-based protein footprints.

Nuts have the lowest CO₂e footprint of any food at 0.43 kg per kg. Furthermore, nut trees sequester carbon over their long productive lives, partially offsetting the footprint of production. However, their water footprint is relatively high at 4,134 litres per kg. Additionally, almonds and cashews in particular rely on irrigation in semi-arid growing regions.

How Diet Changes Reduce Emissions

Diet is one of the most powerful levers individuals have for reducing personal greenhouse gas emissions. Furthermore, Poore & Nemecek found high meat-eaters produce 7.19 kg CO₂e per day from food. Vegans produce 2.89 kg CO₂e — a 60 percent reduction. Additionally, partial reductions also matter. Cutting beef consumption by half reduces annual food emissions by around 30 percent for a typical Western diet.

Replacing one 200g beef meal per week with chicken saves approximately 740 kg CO₂e per year. Furthermore, replacing it with lentils saves approximately 1,010 kg CO₂e per year. That is roughly equivalent to avoiding 4,800 km of driving. Additionally, the swap panel in Single Food mode calculates this precisely for any quantity and frequency you enter.

Food waste is also a significant factor. Furthermore, producing food that is then discarded generates all the same emissions without any nutritional benefit. Additionally, reducing household food waste — particularly for high-footprint animal products — amplifies the environmental benefit of dietary improvements. The most sustainable choice of meat is the one that actually gets eaten.

Frequently Asked Questions

Beef from a beef herd produces approximately 99.5 kg CO₂e per kilogram. Furthermore, beef from a dairy herd (often sold as ground beef) produces about 33.3 kg CO₂e per kg. Additionally, these figures are global medians from Poore & Nemecek (2018) — actual values vary widely by farming system and region. The footprint includes land use change, enteric fermentation, manure and feed production.

CO₂e converts all greenhouse gases to the equivalent amount of CO₂ with the same warming effect over 100 years. Furthermore, methane is approximately 28 times more potent than CO₂ over that period, so 1 kg of methane equals 28 kg CO₂e. Additionally, nitrous oxide is approximately 265 times more potent than CO₂. Using CO₂e allows direct comparison of different foods and activities despite different gas compositions.

Four main factors drive beef's footprint. Furthermore, cattle produce methane during digestion (enteric fermentation). Additionally, they convert feed to meat inefficiently — requiring about 8 kg of feed per kg of beef. Land use for grazing and feed crops is extensive. Manure also produces methane and nitrous oxide. All four factors combine to produce emissions 10 times higher than chicken per kilogram.

Beef requires approximately 15,400 litres of water per kilogram. Furthermore, pork requires 5,988 litres per kg and chicken about 4,325 litres per kg. Additionally, these figures from Mekonnen & Hoekstra (2012) include rainfall absorbed by feed crops, irrigation water and water used in processing. Lentils require about 1,250 litres per kg — one-twelfth of the beef footprint.

High meat-eaters produce approximately 7.19 kg CO₂e per day from food. Furthermore, vegans produce about 2.89 kg CO₂e per day — a reduction of roughly 60 percent. Additionally, even modest reductions in beef and lamb consumption have a disproportionately large impact because these foods dominate total dietary emissions for meat-eaters.

No — emission factors vary significantly by country and farming system. Furthermore, Brazilian beef produced on deforested land has a much higher footprint than European grass-fed beef. Additionally, the values in this calculator are global medians from Poore & Nemecek (2018), derived from 570 studies covering 38,700 farms in 119 countries. They represent typical global production, not any specific origin.

Lamb uses approximately 370 m² per kilogram, making it the most land-intensive common food. Furthermore, beef (beef herd) uses around 326 m² per kg. Additionally, chicken uses about 7 m² per kg and lentils about 3.4 m² per kg. Livestock takes up 77 percent of agricultural land globally while providing only 18 percent of global calories.

Replacing one 200g beef serving per week with chicken saves approximately 740 kg CO₂e per year. Furthermore, replacing it with lentils saves approximately 1,010 kg CO₂e per year — equivalent to avoiding 4,800 km of driving. Additionally, use the plant swap panel in Single Food mode to calculate the exact saving for any quantity and frequency.

Grass-fed beef typically has a higher carbon footprint per kilogram than grain-fed beef. Furthermore, grass-fed cattle grow more slowly and produce more methane over their longer lives before slaughter. Additionally, grain-fed feedlot beef may use cropland intensively, but the faster growth rate means fewer lifetime emissions per kilogram of meat. However, grass-fed systems may offer other benefits including biodiversity and soil health in specific contexts.

References and Methodology

All emission factors, water footprint values and land use figures in this calculator come from peer-reviewed scientific sources. Furthermore, the emission factors are global median values — they represent typical global production, not the best-case or worst-case farms. Additionally, actual values for any specific food product will depend on country of origin, farming system and production practices.

Reducing food's environmental impacts through producers and consumers

Poore J. & Nemecek T. · Science, 360(6392):987–992 · 2018 · doi:10.1126/science.aaq0216

The primary source for all CO₂ equivalent emission factors and land use values in this calculator. This landmark meta-analysis aggregated data from 570 studies covering 38,700 farms producing 40 food products in 119 countries to produce the most comprehensive global life cycle assessment of food systems to date. All emission factors (beef herd 99.5 kg CO₂e/kg, beef dairy herd 33.3, lamb 39.7, pork 12.3, chicken 9.87, turkey 10.9, farmed fish 13.6, shrimp 26.9, eggs 4.67, cheese 23.9, milk 3.15, tofu 3.16, lentils 1.58, nuts 0.43 kg CO₂e/kg) used in this calculator are the global median values from Table S1 and Figure 1 of this paper.

📋 Primary emission factors

A Global Assessment of the Water Footprint of Farm Animal Products

Mekonnen M.M. & Hoekstra A.Y. · Ecosystems, 15:401–415 · 2012 · doi:10.5194/hess-16-179-2012

The source for all freshwater footprint values shown in the water metric and equivalency calculations in this calculator. This study calculated the green, blue and grey water footprint of farm animal products for all major livestock types and production systems globally. The water footprint values used (beef 15,400 L/kg, pork 5,988, chicken 4,325, eggs 3,265, cheese 5,060, milk 1,020, lentils 1,250, tofu 2,350, nuts 4,134 litres per kg) are global weighted average figures from Table 5 of this paper.

📋 Water footprint data

Environmental Impacts of Food Production — Our World in Data

Hannah Ritchie, Pablo Rosado & Max Roser · Our World in Data · Updated 2024 · Based on Poore & Nemecek 2018

Our World in Data's comprehensive interactive visualisation of the environmental impacts of food production, which presents the Poore & Nemecek (2018) data in accessible charts covering greenhouse gas emissions, land use, water use and eutrophication across the full range of food types. Used as a secondary cross-reference to verify the emission factor values displayed in the comparison charts in this calculator, and as the source for the dietary benchmark figures (high meat-eater 7.19 kg CO₂e/day, vegan 2.89 kg CO₂e/day) cited in the How Diet Changes Reduce Emissions section.

📖 Diet benchmarks

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Meat Footprint Calculator

How to Use the Meat Footprint Calculator

CO₂ Emissions from Meat Production — The Data

Why Beef Has Such a Large Carbon Footprint

Enteric fermentation — methane from digestion

Feed conversion inefficiency

Land use and deforestation

Manure management

Pork, Chicken and Seafood — Comparing Footprints

The Water Footprint of Meat

Land Use — The Other Hidden Cost

Comparing Meat with Plant-Based Proteins

How Diet Changes Reduce Emissions

Frequently Asked Questions

References and Methodology

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