Coffee to Water Ratio: How Much Coffee per Cup?
The ideal coffee to water ratio for drip, pour-over, French press, AeroPress and cold brew, with a free calculator, charts and tablespoon conversions.
In this article
The coffee to water ratio is the most important number in brewing. Get it right and you have a solid foundation; get it wrong and no grinder, kettle or fancy bean will save the cup. The good news: it’s simple, and once you’ve found the ratio you like, you can repeat it every morning.
Coffee ratio calculator
Use the calculator below to get exact amounts for your brew method. Choose how many cups you want, or start from the coffee or water you already have.
Coffee-to-water ratio calculator
Coffee
33.8 g
≈ 6.8 tbsp · 1.19 oz
Water
541 g
541 ml · 18.3 fl oz
Coffee in the cup
≈ 473 ml
16 fl oz after grounds absorb water
Weigh coffee and water on a scale for repeatable results. Tablespoon conversions are approximate (≈5 g per level tablespoon of ground coffee, but this varies with grind and bean).
Prefer a full-page version? Open the standalone coffee ratio calculator.
What a coffee to water ratio means
A brew ratio compares the weight of ground coffee to the weight of water. It’s written as 1:X, where X is grams of water for every gram of coffee.
- 1:16 → 20 g of coffee with 320 g of water
- 1:15 → 20 g of coffee with 300 g of water (stronger)
- 1:17 → 20 g of coffee with 340 g of water (lighter)
Because 1 gram of water equals 1 milliliter, you can measure water on a scale or in a measuring jug. Coffee is different: its volume changes a lot with grind size and roast, which is why measuring coffee by weight is so much more reliable.
Best coffee to water ratio by brew method
Different brewers extract differently, so they have different sweet spots. Use these as starting points.
| Brew method | Starting ratio | Range | Example for one mug |
|---|---|---|---|
| Pour-over (V60, Kalita) | 1:16 | 1:15 – 1:17 | 20 g coffee : 320 g water |
| Drip coffee maker | 1:16 | 1:15 – 1:18 | 20 g coffee : 320 g water |
| French press | 1:15 | 1:14 – 1:16 | 24 g coffee : 360 g water |
| AeroPress | 1:15 | 1:12 – 1:16 | 15 g coffee : 225 g water |
| Chemex | 1:16 | 1:15 – 1:17 | 30 g coffee : 480 g water (2 cups) |
| Moka pot | ~1:7 | 1:6 – 1:8 | Fill basket, water to the valve |
| Cold brew concentrate | 1:5 | 1:4 – 1:5 (ready-to-drink ~1:8) | 100 g coffee : 500 g water |
| Espresso | 1:2 (dose : yield) | 1:1.5 – 1:3 | 18 g in : 36 g out |
Espresso and cold brew work differently enough that they have their own tools: the espresso ratio calculator and the cold brew calculator.
How much coffee per cup?
Here’s the quick reference most people are looking for, calculated at 1:16. “Cups” here are standard 8 fl oz cups of brewed coffee.
| Cups (8 fl oz) | Coffee (grams) | Coffee (level tbsp, approx.) | Water |
|---|---|---|---|
| 1 | 17 g | 3½ | 270 ml |
| 2 | 34 g | 7 | 540 ml |
| 3 | 51 g | 10 | 810 ml |
| 4 | 68 g | 13½ | 1,080 ml |
| 6 | 102 g | 20 | 1,630 ml |
| 8 | 135 g | 27 | 2,170 ml |
The water column is a little more than the finished coffee because grounds soak up about twice their weight in water.
Tablespoons vs. grams
A level tablespoon of medium-ground coffee weighs about 5 grams, but it can range from roughly 4 to 7 g. That’s nearly double the coffee from the same “two tablespoons per cup” instruction.
If you don’t have a scale yet, use about 3 level tablespoons per 8 oz cup (roughly 1:16) and keep your scoop and grind consistent. When you’re ready to upgrade, a basic scale makes a bigger difference than almost any other piece of gear. See our best coffee scales guide for picks at every budget.
How to adjust the ratio to taste
Think of the ratio as a strength dial:
- Too strong or heavy? Add more water per gram of coffee (e.g. 1:15 → 1:16).
- Too weak or watery? Use less water per gram (e.g. 1:17 → 1:16).
- Sour, sharp or thin even at 1:15? That’s under-extraction, not ratio. Grind finer or brew longer.
- Bitter, harsh or drying? That’s over-extraction. Grind coarser or shorten the brew.
Change one variable at a time so you know what made the difference. Our grind size chart shows where to start for each method.
Why ratio matters more than you’d think
Ratio sets strength — how concentrated the coffee is. Grind size, time and temperature set extraction — how much flavor you pull from the grounds. Great coffee needs both in the right range. By locking in a ratio first, you remove one variable and make it far easier to dial in the rest.
That’s also why baristas talk about recipes in grams. “20 grams to 320 grams” is precise and repeatable; “two heaping scoops” isn’t.
Next steps
- Put your ratio to work with our step-by-step pour-over guide or French press guide.
- Time your pours with the free pour-over timer.
- Still using pre-ground or a blade grinder? A burr grinder is the next big upgrade — see our best burr coffee grinders.
Frequently asked questions
What is the golden ratio for coffee?
The "golden ratio" usually refers to about 1:18 by weight (roughly 55 grams of coffee per liter of water), a guideline long promoted by specialty coffee associations. In practice, most home brewers enjoy anything from 1:15 to 1:17.
How many scoops of coffee for 12 cups?
A 12-cup drip machine usually means twelve 5–6 oz "cups", or about 60–72 fl oz of water. At 1:16 that needs roughly 110–135 g of coffee — about 22–27 level tablespoons, or 11–13 standard 2-tablespoon scoops.
How much coffee for 4 cups of water?
Four US cups is 32 fl oz, or about 950 ml of water. At 1:16 use about 60 g of ground coffee, which is around 12 level tablespoons.
Is 1:15 or 1:17 stronger?
1:15 is stronger. The second number is the amount of water per gram of coffee, so a smaller number means less water and a more concentrated cup.
Should I measure coffee by weight or by scoop?
By weight whenever possible. A tablespoon of ground coffee can weigh anywhere from about 4 to 7 grams depending on the grind and bean, so weighing makes your coffee much more consistent.