Coffee Ratio Calculator

How to Use the Coffee Ratio Calculator

Select your brew method, enter how many cups you are making and the size of your mug, choose a strength preference, and click Calculate. The tool gives you the exact weight of coffee needed in grams, the approximate tablespoon equivalent, the water volume, and specific brewing parameters for your chosen method.

Using grams is always more accurate than tablespoons — a level tablespoon of coarsely ground coffee and a level tablespoon of finely ground coffee weigh different amounts. A kitchen scale producing grams is the tool that separates consistently good coffee from occasionally good coffee.

Coffee Ratios Explained by Brew Method

Pour Over — 1:15 to 1:17

Pour over methods (V60, Chemex, Kalita Wave) produce a clean, bright, tea-like cup that highlights the origin characteristics of the coffee. The relatively high water-to-coffee ratio extracts clearly defined flavour notes without the heaviness of immersion methods. Grind size is critical — too fine and it will be bitter and over-extracted; too coarse and it will be sour and under-extracted. Aim for a coarse-medium grind (slightly coarser than table salt).

The bloom step is non-negotiable for great pour over: pour twice the weight of coffee in water first (e.g. 30g water for 15g coffee), stir gently, and wait 30 seconds. This releases trapped CO₂ from freshly roasted coffee and ensures even extraction in the subsequent pour.

French Press — 1:14 to 1:16

French press is a full-immersion method — the coffee grounds sit in contact with the water for the entire brew time. This produces a full-bodied, rich cup with more oils and texture than filter methods. The plunger does not actually filter — it just pushes the grounds to the bottom. For this reason, french press coffee should be drunk immediately after pressing or poured into a separate carafe; otherwise the grounds continue extracting and the cup turns bitter.

Espresso — 1:1.5 to 1:2

Espresso operates on an entirely different ratio to other methods. A standard “double shot” uses 18–20g of finely ground coffee and produces 36–40g of liquid espresso (a 1:2 ratio). This concentrated, high-pressure extraction is designed to be consumed in a small volume or used as a base for milk drinks. The ratio, combined with grind size, determines whether an espresso tastes balanced, sour (under-extracted, too fast), or bitter (over-extracted, too slow).

Cold Brew — 1:4 to 1:8

Cold brew uses an extremely high coffee-to-water ratio because the cold water extracts far less efficiently than hot water. The result — after 12–24 hours — is a coffee concentrate that is typically diluted 1:1 with water or milk before drinking. If you prefer ready-to-drink cold brew, use a ratio closer to 1:8. For concentrate (to be diluted), use 1:4 to 1:5.

AeroPress — 1:12 to 1:14

The AeroPress is one of the most versatile brewing devices ever made. Its combination of pressure, immersion, and a short brew time produces a cup somewhere between espresso and filter coffee. The standard ratio of around 1:13 works for most recipes, but AeroPress is a genuine experimentation platform — you can make anything from a concentrate (diluted with water) to a near-filter-style cup depending on grind, time, and pressure.

Why Coffee Weight Matters More Than Volume

A tablespoon of whole bean coffee, a tablespoon of coarsely ground coffee, and a tablespoon of espresso-fine ground coffee all weigh different amounts. Even with the same grind size, a heaped tablespoon versus a level tablespoon can vary by 25–30%. Using grams eliminates all of this variability. Invest in a digital scale — even a basic one accurate to 1g makes an enormous difference to consistency.

Water Quality and Temperature

Coffee is 98–99% water. If your water tastes bad, your coffee will taste bad. Filtered water is strongly recommended for home brewing. The ideal mineral content for coffee is around 150ppm total dissolved solids — bottled still mineral water is often a good option if your tap water is heavily chlorinated or very hard.

Water temperature affects extraction speed and flavour. The SCA recommends 93°C (199°F) — just off the boil (which is 100°C). Boiling water can scald coffee and introduce bitter, over-extracted notes. For AeroPress and cold brew methods, lower temperatures work intentionally to alter the extraction profile.

Frequently Asked Questions