Coffee Brew Ratio Calculator — Coffee to Water
CalculatorA coffee brew ratio calculator multiplies coffee weight by the water ratio to find the water amount for a brewing recipe.
What is it
Pour-over, French press, and cold brew recipes are often expressed as coffee:water = 1:n. This tool turns coffee grams and the n value into a water amount and total input weight. Taste still depends on grind, water temperature, brew time, and beans, so treat the ratio as a starting point.
water = coffee × ratio; total input = coffee + water
How to use
- 1Enter coffee weight in grams.
- 2Enter the water ratio, such as 15, 16, or 17.
- 3Use the calculated water amount, then adjust by taste.
Reference
| Coffee | Ratio | Water |
|---|---|---|
| 20g | 1:15 | 300ml |
| 25g | 1:16 | 400ml |
| 40g | 1:12 | 480ml |
Sources & standards
- MDN Web Docs: Client-side web APIs - MDN Web Docs
- Arithmetic operations - Wikipedia
FAQ
Can I treat water grams and milliliters as the same?
For everyday brewing, 1g of water is close enough to 1ml.
What ratio should I start with?
Pour-over often starts around 1:15 to 1:17. Use a lower ratio for stronger coffee and a higher ratio for lighter coffee.
Is input sent to a server?
No. The calculation runs only in your browser.