Food Carbon Footprint Calculator
Written by Thierno Sadou Diallo, formula verified per our methodology • Last checked on 9/5/2026
A food's CO2 emissions are calculated with weight × emission factor per category. 1 kg of beef represents about 26.2 kg of CO2 equivalent, versus about 0.3 kg for 1 kg of vegetables — a gap of nearly 90 times between these two categories.
Explanation
A food's carbon footprint varies enormously by category, mainly depending on whether it's animal- or plant-based and how long its production chain is. Beef clearly stands out as the most emitting food (about 26.2 kg of CO2 equivalent per kg), notably because of methane emissions from cattle digestion and the farmland needed to raise them. Fish, pork, and poultry sit at an intermediate level (about 6.5 to 7.7 kg CO2e/kg), while cheese and eggs are a bit less emitting. Legumes, and especially vegetables and fruit, show a noticeably lower footprint (0.3 to 0.7 kg CO2e/kg), which is why a diet with a larger share of plant-based food generally reduces a plate's overall carbon footprint. These factors remain averages that mask significant real-world variability depending on the production method (intensive or extensive farming, local or imported origin, season), transport, and processing — two products in the same category can have noticeably different footprints in practice.
Example: 500 g of pork or poultry
Inputs
Weight: 500 g (0.5 kg). Type: pork or poultry.
Calculation
Emissions = 0.5 × 6.56 = 3.28 kg of CO2 equivalent.
Result
This portion represents about 3.28 kg of CO2 equivalent.
Frequently asked questions
Why does beef emit so much more than other meats?
Mainly because of digestion in cattle (and other ruminants), which produces methane, a greenhouse gas noticeably more potent than CO2 in the short term, as well as the large amount of farmland needed to produce their feed (pasture, fodder crops) and their slower growth compared to poultry or pork.
Are these factors the same for organic or local farming?
Not necessarily: the production method (intensive or extensive), the origin (local or imported, with or without air transport), and seasonality can significantly change a given product's actual footprint compared to this average. Extensive farming, for example, can have a different footprint than intensive farming for the same type of meat, in either direction depending on the indicators considered.
Does cutting meat consumption have a meaningful carbon impact?
Given the large gap between categories (a factor of about 9 between beef and poultry, and about 90 between beef and vegetables), replacing part of your red meat consumption with poultry, legumes, or vegetables can have a noticeable carbon impact on your overall diet, without requiring a complete change of diet.