Coffee brew ratio calculator
Grams of coffee and water for your brew.
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How it's calculated
Brew ratio is grams of coffee to grams of water, and a millilitre of water weighs a gram, so a 1:16 pour-over needs 500 ÷ 16 ≈ 31 g of coffee for 500 ml. Each method has a usual range: 1:15 to 1:17 for filter methods, tighter for immersion and much tighter for concentrates and espresso, where the “water” is the drink in the cup. Pick the method, tell the tool what you know, and it fills in the other side. Go a point stronger or weaker to taste; the ratio is a starting line, not a law.
What is the golden ratio for coffee?
The Specialty Coffee Association suggests about 55 g of coffee per litre of water, which is 1:18, with 1:15 to 1:18 as the acceptable range. Most home brewers land at 1:16 for pour-over and drip. Stronger is a lower number: 1:14 is bolder, 1:18 lighter.
How much coffee for a 12-cup drip machine?
A "cup" on a coffee maker is 5 oz (150 ml), so 12 cups is 1.8 litres: about 105 g at 1:17, roughly 20 level tablespoons. Many people find that strong; 1:18 gives 100 g. Choose Drip machine, enter 1800 for the water and adjust.
Why weigh instead of scoop?
A scoop of dark roast weighs less than a scoop of light roast, and coarse grounds pack differently from fine ones, so "two scoops" can be 20% apart from day to day. A cheap scale fixes the single biggest variable in home brewing.
Results are estimates for informational purposes only and are not financial, medical or legal advice.