Coffee to Water Ratio Calculator
Find how much coffee or water you need for a given brew ratio, from a strong 1:15 to a mild 1:18. Enter one amount and get the other in grams. Calculates in your browser.
Coffee needed
-
Show the math
A ratio of 1:N uses N grams of water for each gram of coffee (N is the ratio you enter):
coffee = water ÷ ratio
water = coffee × ratio
A 1:16 ratio (62.5 g coffee per liter of water) is a common all-rounder. Go lower (1:15) for a stronger cup or higher (1:18) for a milder one. The Specialty Coffee Association's Golden Cup standard is 55 g per liter ± 10%, about 1:16.5 to 1:20. A kitchen scale gives far more consistent coffee than scoops, since bean density varies.
What this does
A coffee to water ratio calculator finds how much coffee or water you need for a given brew ratio, from a strong 1:15 to a mild 1:18.
How to use it
- Choose your brew ratio.
- Enter the coffee or water amount.
- Read the other in grams.
- Adjust the ratio to taste.
How it works
A 1:16 ratio (62.5 g of coffee per liter of water) is a popular all-rounder; the Specialty Coffee Association’s Golden Cup standard is 55 g per liter ± 10%, about 1:16.5 to 1:20. One gram of water is about one milliliter, so the math stays simple.
water = coffee × ratio (e.g. ×16)
Understanding your result
The ratio sets strength: a tighter ratio like 1:15 brews a bolder cup, while 1:18 is lighter, with 1:16 a reliable starting point. Dial it to taste, and keep the ratio fixed when you change batch size so the cup stays consistent from one brew to the next.
Example
At 1:16, 30 g of coffee needs about 480 g of water.
Last updated .
Frequently asked questions
What is a good coffee-to-water ratio?
A 1:16 ratio (62.5 g of coffee per liter of water) is a popular all-rounder. Use 1:15 for a stronger cup or 1:18 for a milder one. The Specialty Coffee Association’s Golden Cup standard is 55 g per liter ± 10%, roughly 1:16.5 to 1:20.
Do I measure in grams or milliliters?
Grams are most consistent. One gram of water is about one milliliter, so a 1:16 ratio works out to roughly 16 ml of water per gram of coffee.
Why use a scale instead of scoops?
Bean size and roast change how much a scoop weighs, so the same scoop can vary a lot. Weighing the coffee gives a far more repeatable brew.
Is my data stored?
No. Everything is calculated locally in your browser.
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