Back to the demosDEMO — illustrative data

Coffee shop (Istanbul, Beyoğlu)

Pick your cup; the footprint updates with every choice.

One drink's footprint.

Cup size (mL)

A bigger cup means more milk or hot water; the coffee stays the same.

Drink

In milky drinks, milk shows on its own line.

assumption (common barista ratio)Recipes use common barista ratios; a real café enters its own.

Milk

Your milk choice changes only the milk line.

Café's solar share

How much of the café's electricity comes from its rooftop panels? The higher the share, the smaller the electricity line.

25%

Footprint per cup

18 g coffee · 36 mL espresso · 211 mL milk · 53 mL foamWater: 36 mL (its footprint is counted in the electricity)
  • Coffee514 g CO₂e

    18 g coffee × 28.53 kg CO₂e/kg

  • Milk665 g CO₂e

    211 mL × 3.15 kg CO₂e/litre (Cow's milk)

  • Electricity (machine)20 g CO₂e

    0.057 kWh × (1 − 25% solar) = 0.043 kWh from the grid × 0.469 kg CO₂e/kWh (Türkiye grid)

Total per cup1,199 g CO₂e

CO₂e: different greenhouse gases expressed as CO₂.

Assumptions: 18 g of coffee, 211 mL of milk (by drink and size) and 0.057 kWh of electricity per cup; a real café would measure these. Electricity uses the Türkiye grid average; there is no Beyoğlu-specific data. The solar share is given no emissions in this demo (the panels' own manufacturing footprint is not included).

The assumptions in this demo

  • assumption (common barista ratio)

    Espresso: a single shot is 7 g of coffee, about 30 mL; a double is 18 g, about 36 mL. Americano, latte and cappuccino are built on a double shot at every size.

    A common barista ratio (a double at about 1:2), not a sourced factor.

  • assumption (common barista ratio)

    The rest of the cup beyond the double shot: hot water in an americano; 80% milk in a latte and 58% in a cappuccino, the rest foam.

    Frothed milk takes more room; a cappuccino has more foam.

  • assumption

    Coffee machine: 0.04 kWh per drink (heating the shot's water included).

    A café machine stays hot all day; this is a rough share of its daily use per cup.

  • assumption

    Steaming milk: 0.08 kWh per litre; hot water: 0.1 kWh per litre.

    The energy to bring milk from fridge-cold and water from the tap to serving heat, with the machine's losses.

Sources and factors

Sources: coffee and milk, Poore & Nemecek (2018, Science); electricity, ETKB 2023 Türkiye grid factor.

factors@1.24.1

Total per cup1,199 g CO₂e Line-by-line breakdown