Coffee Carbon Footprint Calculator

A typical black drip coffee produces about 0.3 kg of CO2e per cup when the coffee is valued at the Poore & Nemecek (2018) global mean of 17 kg CO2e per kilogram of ground roasted coffee. Add 150 ml of dairy milk and that roughly doubles to about 0.8 kg CO2e per cup, because milk carries about 3.2 kg CO2e per litre. Brew method, cup type and origin shift the number up or down.

The widely cited global mean is 17 kg CO2e per kilogram of ground roasted coffee, from the Poore & Nemecek (2018) meta-analysis published in Science, covering about 38,700 farms in 119 countries. This is a mean, not a single farm's number: other life-cycle studies report anywhere from about 2 to 15 kg CO2e per kilogram depending on farming practice, processing and transport, so treat 17 as a defensible global estimate rather than an exact value.

Instant coffee usually has the lowest footprint per cup because it uses only about 2 grams of coffee per serving. Among full-flavour methods, espresso has a small dose (about 18 g) and short energy use, while batch brew shares its heating energy across many cups. Pod machines add about 0.02 kg CO2e per pod in plastic or aluminium waste. The biggest lever is not the method but the milk: a large dairy milk adds more CO2e than the coffee itself.

The milk dominates. A latte with 200 ml of dairy milk carries about 0.64 kg CO2e from milk alone (0.2 L × 3.2 kg/L), while the espresso's 18 g of coffee carries about 0.34 kg CO2e (0.018 kg × 17 kg/kg × 1.10 for transport). Switch that milk to oat milk at 0.9 kg CO2e per litre and the milk part drops to about 0.18 kg CO2e — roughly a 72% cut of the milk portion.

Yes, by a wide margin on greenhouse gases. Poore & Nemecek (2018) put dairy milk at about 3.2 kg CO2e per litre versus about 0.9 for oat, 1.0 for soy and 0.7 for almond — dairy is roughly three times as emission-intensive as plant milks on average. Oat milk also uses far less land (about 0.8 m² per litre per year versus 8.9 for dairy). Almond milk has the lowest CO2e of the three but the highest water use, so there is no single perfect answer.

Coffee has the highest footprint of the three. A cup of coffee is roughly 0.3–0.7 kg CO2e depending on milk, a cup of tea is on the order of 0.02 kg CO2e per 250 ml, and a 330 ml soda can is about 0.17 kg CO2e. So swapping one daily milky coffee for tea can save on the order of 100–200 kg CO2e per year — roughly the emissions of driving 500–1,000 km in an average petrol car.

Not meaningfully. Decaffeination adds a processing step, but the farming, shipping and roasting — which dominate the footprint — are the same. This calculator treats decaf as equal to regular coffee, which is a reasonable assumption given the available life-cycle data. If you drink decaf, your footprint is driven by the same levers: dose, milk and cup.

It scales fast. One black drip coffee a day at about 0.31 kg CO2e per cup is about 113 kg CO2e per year — roughly 540 km of driving. One dairy latte a day at about 1.0 kg CO2e per cup is about 365 kg CO2e per year, roughly the emissions of a short domestic flight. Two cups a day doubles both numbers.

They add up, but they are usually smaller than the coffee and milk. A disposable paper cup is estimated here at about 0.03 kg CO2e. For a daily drinker that is about 11 kg CO2e per year — roughly 3% of a dairy latte habit. A reusable cup wipes that out entirely, and it is one of the easiest swaps in the planner below.

Switch from dairy milk to a plant milk. For a one-large-latte-a-day drinker, moving from dairy to oat milk saves about 0.58 kg CO2e per cup, or about 210 kg CO2e per year — larger than changing brew method, cup type or origin combined. Going black saves even more. Use the reduction planner above to see your own numbers.

The coffee and milk factors come from the Poore & Nemecek (2018) Science meta-analysis, a peer-reviewed global dataset. Cup, pod, energy, car, tree and phone-charge figures are labelled estimates because they vary by product, grid and car. Treat the result as a good-order-of-magnitude estimate for comparing habits, not a certified personal footprint.

Only modestly. Shipping green coffee across the world adds a rough 5–15% on top of the farm-gate footprint in this calculator, because farming, fertiliser and processing dominate the total. A long-haul import is therefore worse than a regional roast, but switching milk or cutting one cup a day matters far more than switching origin.