Coffee Footprint Calculator

Coffee does have an environmental footprint, but it's not the biggest dietary villain. A single cup of black coffee produces roughly 21g CO₂e, which is modest compared to beef or cheese. The biggest factors are milk type and preparation method — swapping dairy for oat milk and avoiding pod machines can cut your coffee footprint by over 50%.

For milk-based drinks like lattes and cappuccinos, dairy milk is typically the largest single source of emissions — accounting for up to 65–70% of the total footprint. For black coffee, the coffee grounds and processing at origin dominate. Choosing a plant-based milk alternative is the single most impactful change you can make.

A plain espresso emits around 21g CO₂e per cup. A latte made with whole dairy milk can reach 340g CO₂e. A pod/capsule coffee adds an extra ~30g CO₂e over a drip or espresso machine due to the aluminium or plastic capsule. These numbers can vary depending on where the coffee was grown, how it was transported, and how it was roasted.

Oat milk and soy milk are generally the lowest-footprint options, producing roughly 0.9–1.0 kg CO₂e per litre compared to 2.4–3.2 kg CO₂e for whole dairy milk. Almond milk has a low carbon footprint but a very high water footprint, so oat milk is often recommended as the most balanced choice for sustainability.

It takes approximately 140 litres of water to produce a single cup of coffee when accounting for all agricultural water use. This is mainly due to rainfall required to grow coffee plants. Brazil and Ethiopia, major producing countries, rely heavily on rainwater ('green water'), but water stress at origin is still a concern in some regions.

Drinking one espresso daily (black, no milk) for a year produces roughly 7.7 kg CO₂e — comparable to driving about 40 km in an average petrol car. If you add whole dairy milk to make a latte, that climbs to around 120 kg CO₂e per year for one cup per day.

The most effective steps are: (1) switch from dairy to oat or soy milk, (2) avoid single-use pod/capsule machines or use compostable pods, (3) use a reusable cup instead of disposable paper cups, (4) buy sustainably certified coffee (e.g. Rainforest Alliance, Fairtrade), and (5) compost your used coffee grounds rather than sending them to landfill.

Used coffee grounds are surprisingly versatile. They can be composted to enrich garden soil, used as a natural exfoliant, repel garden pests, absorb fridge odours, or even be processed into biofuel. Some companies now collect commercial coffee grounds to convert into biodiesel or biomass energy, reducing landfill methane emissions.