What is the golden ratio for coffee?

The Specialty Coffee Association recommends a ratio of 1:15 to 1:18 (coffee to water by weight) for filter coffee. A 1:16 ratio is widely considered the golden middle ground — that is about 62.5g of coffee per litre of water.

Why is the espresso ratio so different?

Espresso is a concentrated extraction method that forces hot water through finely-ground coffee under pressure. The 1:2 ratio means for 18g of coffee you use about 36ml of water, producing a small, intense shot. Filter methods use more water for a lighter, larger drink.

Should I measure coffee by weight or volume?

Always by weight. A tablespoon of finely-ground coffee weighs more than a tablespoon of coarsely-ground coffee. Using a kitchen scale (ideally accurate to 0.1g) ensures consistency every time you brew.

How does grind size affect the result?

Finer grinds extract more quickly and produce stronger coffee for the same ratio. Coarser grinds extract less. Match your grind to your method: fine for espresso, medium for pour-over, coarse for French press. Adjust the ratio if you change grind size.

What cup size should I use?

A standard UK mug holds about 250-300ml. A small cup is about 150ml. The calculator defaults to 250ml but you can adjust this to match your preferred cup or mug size.

How do I make stronger or weaker coffee?

To make stronger coffee, use a lower ratio (e.g. 1:14 instead of 1:16). For lighter coffee, use a higher ratio (e.g. 1:18). You can also select the custom ratio option to dial in your personal preference.

BakeCalcs

Coffee Brew Ratio Calculator

Calculate the right amount of coffee grounds and water for your brew method and desired strength.

Brew Method

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Number of Cups

Cup Size

How We Calculate This

Coffee brewing ratios express the relationship between coffee grounds (by weight) and water (by weight or volume — 1ml of water weighs 1g). The ratio determines the strength and extraction of your coffee.

Standard Ratios by Method

Pour-over / filter: 1:15 to 1:17 (we use 1:16)
French press: 1:15
Espresso: 1:2
AeroPress: 1:12 (makes a concentrate)
Moka pot: 1:7

The Formula

Coffee (g) = Water (ml) / Ratio
Water (ml) = Coffee (g) x Ratio

Frequently Asked Questions

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Last updated: February 2026

All calculations are based on standard ratios and conversions. Results may vary with specific ingredients, equipment, and conditions.