Choosing the ratio first and then the amount keeps your coffee consistent from day to day. If coffee tastes weak, use a stronger ratio (a smaller number); if it tastes bitter or harsh, use a weaker one or a coarser grind.
How to use the Coffee to Water Ratio Calculator
- Brew method and strength
- Custom ratio (1 : x)
- Water
- Every result field is editable: type into Coffee and Water plus every other field update to match.
Results update as you type, and every field accepts the units shown in its menu.
How it works
Choose the brew method and strength (or a custom ratio), then enter the amount of water (or type the coffee into the result).
Tips
- Weigh coffee beans rather than using scoops – roast level and grind change how much a scoop holds.
- Grind just before brewing and match the grind size to the method (fine for espresso, coarse for French press and cold brew).
- Use filtered water just off the boil (90–96 °C / 195–205 °F) for hot coffee.
- Adjust the ratio to taste in small steps – one change at a time.
Common mistakes to avoid
- Using boiling water on green or white tea, which turns it bitter.
- Forgetting that caffeine content varies widely between drinks and brands.
- Comparing ratios written different ways (1:16 coffee:water vs 60 g per litre).
Inputs explained
| Field | What to enter |
|---|---|
| Brew method and strength | Choose one: General brewing – regular (1:18), General brewing – strong (1:15), Drip / pour-over – regular (1:17), Drip / pour-over – strong (1:15) … |
| Custom ratio (1 : x) | A number |
| Water | Units: ml, cups, fl oz, L, tbsp |
What each result means
- Coffee = [Water]÷[Ratio]
- Level tablespoons of ground coffee = [Coffee]÷5.3
- Coffee scoops (2 tbsp) = [Coffee]÷10.6
- 8 oz cups of brewed coffee = ([Water] – 2×[Coffee])÷236.6
Example values
How the main result changes when Water changes and everything else stays at the example values above:
| Water (ml) | Coffee (g) |
|---|---|
| 250 | 14.7 |
| 375 | 22.1 |
| 500 | 29.4 |
| 625 | 36.8 |
| 750 | 44.1 |
| 1,000 | 58.8 |
Formula
Coffee = water ÷ ratio; water = coffee × ratio
Regular ratios: drip 1:17, French press 1:15, cold brew 1:8; strong: drip 1:15, French press 1:12, cold brew 1:5
Worked example
Inputs — Brew method and strength: Drip / pour-over – regular (1:17); Water: 500 ml.
Results — Coffee = 29.4 g; Level tablespoons of ground coffee = 5.5; Coffee scoops (2 tbsp) = 2.8; 8 oz cups of brewed coffee = 1.9.
Frequently asked questions
How much coffee for 12 cups of water?
About 160–170 g (5.6 oz) at 1:17.
How much coffee per cup?
About 2 level tablespoons (10–11 g) for 6 fl oz of water.
Why does the ratio matter?
It controls strength; extraction (taste) is then adjusted with grind size and time.