Coffee Ratio Calculator

Frequently Asked Questions

What is the standard coffee-to-water ratio?

The SCA Golden Cup standard for drip is about 55 g of coffee per 1 L of water, close to 1:18. Most home pour-over and drip brewers use 1:15 to 1:17. Espresso is far stronger, typically 1:2.

How do I weigh water without a scale?

1 ml of water weighs 1 g, so a measuring jug works. For drip brewing, 16 oz (473 ml) of water needs about 28-30 g of coffee.

Why do my numbers depend on brew method?

Espresso (1:2), AeroPress (1:12 to 1:16), pour-over (1:16 to 1:17), French press (1:15), cold brew concentrate (1:5 to 1:8) all extract differently. Use the right ratio for the gear.

Should I weigh beans before or after grinding?

Before. Grinding loses a tiny bit of mass to fines and dust. Weigh whole beans for consistent dose-to-water ratios.

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Estimates for informational purposes only.

Important Disclaimer: Estimates for informational purposes only.

This calculator provides estimates for informational purposes only. Results are based on assumptions and may not reflect actual outcomes. Consult qualified professionals in relevant fields before making important decisions based on these results.

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How This Calculator Works

Select a brew method, then choose whether you want to calculate water from a known coffee dose, coffee from a known water volume, or scale everything by the number of cups. The ratios used for each method are based on Specialty Coffee Association (SCA) guidelines and widely accepted specialty coffee standards. Results show both metric (ml) and imperial (fl oz) volumes.

Understanding Coffee-to-Water Ratios

The ratio is expressed as coffee : water by weight. A 1:15 ratio means 1 gram of coffee for every 15 grams (ml) of water. Using weight - not volume - is critical for consistency because ground coffee volume varies enormously by grind size, density, and roast level. A kitchen scale is the single biggest upgrade for consistent coffee at home.

Ratios by Brew Method

Pour Over (1:15 to 1:17): Classic ratio for bright, clean cups. A 1:16 ratio is the SCA standard. Adjust within this window to taste: closer to 1:15 for richer cups, 1:17 for lighter ones.

French Press (1:12 to 1:15): Immersion brewing extracts more efficiently, so slightly less water is needed. The full-bodied, heavy mouthfeel comes from oils and fine particles not caught by the metal filter.

AeroPress (1:10 to 1:15): The most flexible method: pressure allows both espresso-style concentrates and standard filter-style cups. Experiment freely; the AeroPress World Championship is won by unusual recipes.

Espresso (1:2 to 1:2.5): A 1:2 ratio (18g in, 36g out) is the industry benchmark for a balanced double shot. Shorter ratios (1:1.5) pull ristrettos; longer (1:3) produce lungos.

Cold Brew (1:7 to 1:8): Cold brew is brewed as a concentrate and typically diluted 1:1 with water or milk before serving. The ratio here reflects the concentrate stage.

Drip (1:15 to 1:18): Auto-drip machines often run a bit weaker. The SCA Golden Cup standard targets 1:17.42 for this method specifically.

Grind Size and Extraction

Ratio is one variable; grind size is another. Too coarse and the coffee is under-extracted - sour, thin, and weak despite the right ratio. Too fine and it is over-extracted - bitter and astringent. For any brew method, dial in the grind first with a fixed ratio, then adjust the ratio to taste once extraction is balanced.

Coffee Ratio Calculator

Frequently Asked Questions

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