Home › Home & Construction › Coffee Ratio Calculator
Coffee Ratio Calculator
Use this free coffee ratio calculator to brew consistently great coffee every time. Pick your brew method, enter how much coffee or water you have, and the calculator works out the other side — in grams, ounces, tablespoons, or cups. No more guessing with scoops: the same ratio, measured by weight, gives you the same cup morning after morning.
| Amount | Value |
|---|---|
| Coffee needed | 31.25 g (1.10 oz) |
| Water needed | 500 g (17.64 oz) |
| Coffee in tablespoons | ≈ 4.2 tbsp |
| Cups brewed (8 fl oz each) | 2.1 cups |
| Ratio used | 1:16 |
How it works
A coffee ratio is written as 1:X, where X is how many grams of water you use for every gram of coffee. The standard starting point for most brewed coffee is 1:16, and the Specialty Coffee Association's "golden ratio" range is roughly 1:15 to 1:18. A smaller second number means a stronger cup — 1:14 uses more coffee per cup of water — and a larger number means a lighter cup. The math is one division: coffee equals water divided by the ratio, and water equals coffee times the ratio. With 500 grams of water at 1:16, the coffee is 500 ÷ 16 = 31.25 grams.
Each brew method has its own usual ratio because each one extracts coffee differently. Pour over and drip machines both sit at 1:16, the balanced default. French press runs stronger at 1:14, because the metal filter lets oils and fine grounds through and the full immersion steep extracts more. AeroPress is usually 1:13 for a concentrated cup you can dilute, and Chemex sits at 1:15 because its thick paper filter makes a very clean cup. Cold brew is the outlier: at 1:8 it makes a concentrate that you dilute about half and half with water or milk when serving. Espresso is the extreme case at 1:2, so 18 grams of coffee yields about 36 grams of liquid espresso — which is why it tastes so intense.
1 cup (8 fl oz) of brewed coffee ≈ 237 g of water
Weighing your coffee and water is the single biggest upgrade you can make to your brewing, because scoops are wildly inconsistent: a tablespoon of light-roast beans can weigh 30 percent more than a tablespoon of dark-roast beans. A cheap kitchen scale removes that guesswork entirely, and this calculator gives you the exact gram weights to aim for. If you do not have a scale yet, the calculator also converts the coffee weight into tablespoons, using about 7.5 grams per tablespoon of whole-bean coffee, but treat that as an approximation and get a scale when you can.
Use the "I know my" menu to work from whichever side you have. If you know how much water your carafe holds, the calculator tells you the coffee. If you have a bag of beans and want to know how much water it will brew, enter the coffee instead. If you just know how many cups you want, pick cups: each cup is 8 fluid ounces, or about 237 grams of water, so two cups is 473 grams of water, which at 1:15 needs 473 ÷ 15 = 31.5 grams of coffee. The strength adjustment nudges the coffee up or down by 10 percent, which is a good first step when a brew tastes weak or bitter: weak coffee usually needs more coffee or a finer grind, while bitter coffee usually needs less coffee, a coarser grind, or cooler water.
Worked example
You want to brew pour over coffee with 500 grams of water at the standard 1:16 ratio.
Step 1: The ratio is 1:16, so divide the water by 16.
Step 2: Coffee = 500 ÷ 16 = 31.25 grams.
Step 3: In ounces, 31.25 grams is about 1.10 ounces.
Step 4: In tablespoons, 31.25 ÷ 7.5 = about 4.2 tablespoons.
Step 5: Cups brewed — 500 ÷ 237 = about 2.1 cups of 8 fluid ounces each.
The result is 31.25 grams of coffee for 500 grams of water. For a second example, two cups of coffee is 473 grams of water, and at a 1:15 ratio the coffee is 473 ÷ 15 = 31.5 grams. Try the French press preset with the same 500 grams of water and the calculator gives 500 ÷ 14 = 35.7 grams of coffee — stronger, as French press should be.
FAQ
What is a good coffee to water ratio?
A good starting ratio for most brewed coffee is 1:16, meaning 1 gram of coffee for every 16 grams of water. For 500 grams of water that is 31.25 grams of coffee. Stronger brews use 1:14 or 1:15, and lighter brews use 1:17 or 1:18.
How much coffee do I need for 2 cups?
Two cups of coffee is about 473 grams of water. At a 1:15 ratio that needs 31.5 grams of coffee, and at the standard 1:16 ratio it needs about 29.6 grams. Weigh the water and divide by your ratio to get the exact coffee weight.
What ratio should I use for French press?
French press works best at 1:14 to 1:15, a little stronger than pour over, because the metal filter lets more oils and fine grounds through. Use 1:14 for a bold cup and 1:15 for a balanced one, with a coarse grind and a 4-minute steep.
What is the coffee ratio for cold brew?
Cold brew concentrate uses a strong ratio around 1:5 to 1:8, then you dilute it with water or milk when serving. Ready-to-drink cold brew uses about 1:10 to 1:12. This calculator's cold brew preset is 1:8, which makes a concentrate you dilute roughly half and half.
Does the coffee ratio change for espresso?
Yes. Espresso uses a much tighter ratio, typically 1:2, so 18 grams of coffee yields about 36 grams of liquid espresso. That is why espresso tastes so intense compared with drip coffee, which uses about eight times as much water per gram of coffee.