Coffee-to-Water Ratio Calculator
Enter either the amount of water you're brewing or the amount of ground coffee you have, plus your target ratio, and this tool tells you the other side of the equation in grams, tablespoons, and cups.
How this calculation works
Coffee strength is expressed as a ratio of coffee (grams) to water (grams, which is the same as millilitres for water). A 1:16 ratio means 1 gram of coffee for every 16 grams of water.
When you know your water amount, coffee needed = water ÷ ratio. When you know your coffee amount, water needed = coffee × ratio. Both directions use the same ratio number.
Tablespoons are estimated at 5.3 g of ground coffee per level tablespoon, a standard approximation — a kitchen scale is always more accurate than scooping. Cups use the common 240 ml coffee-brewer cup, not a legal or metric cup.
Worked example
Coffee-to-water ratio chart by brew method
Different brewing methods extract flavor at different rates, so the ideal ratio shifts by method. Use this chart as a starting point, then adjust to taste.
| Brew method | Typical ratio | Character |
|---|---|---|
| Espresso | 1:2 | Very concentrated, measured differently (shot-based) |
| French press | 1:12 – 1:15 | Full-bodied, more sediment |
| Moka pot | 1:10 – 1:13 | Strong, stovetop pressure brewing |
| Drip machine | 1:15 – 1:17 | Balanced, everyday cup |
| Pour-over | 1:16 – 1:17 | Clean, bright, paper-filtered |
| Cold brew concentrate | 1:8 – 1:10 | Steeped 12–24h, diluted before drinking |
Why ratio matters more than 'scoops'
Two people scooping the same tablespoon of coffee can end up with very different weights depending on roast (dark roast beans are less dense than light roast) and grind size. Because extraction depends on the actual mass of coffee relative to water, scooping introduces a swing of 20% or more from one batch to the next.
Weighing both coffee and water removes that variable entirely, which is why baristas and specialty roasters always specify ratios in grams rather than scoops or cups.
Dialing in your ratio
- Start at 1:16 for drip or pour-over as a neutral baseline.
- Taste too weak or watery? Move to a lower number like 1:15 or 1:14 (more coffee per water).
- Taste too bitter or heavy? Move to a higher number like 1:17 or 1:18 (less coffee per water).
- Change grind size before changing ratio if the coffee tastes sour (grind finer) or harsh (grind coarser).
- Keep water temperature around 90–96°C (195–205°F) — ratio calculations assume a normal extraction temperature.