What is the best coffee to water ratio?

Between 1:15 and 1:17 for filter coffee, with the golden cup standard sitting near 1:16.7. French press runs stronger at 1:12, espresso is about 1:2, and cold brew concentrate is 1:8 before dilution.

How much coffee do I need for a full 12-cup carafe?

A 12-cup carafe holds 12 five-ounce cups, about 1,775 ml. At 1:16 that means roughly 111 g of coffee, but you need to add water to cover absorption — about 1,995 g in total to actually fill the carafe.

Why do coffee machines measure cups as five ounces?

Carafe markings follow an old convention where a cup is 5 fl oz — smaller than the 8 fl oz measuring cup and much smaller than the mug most people drink from. It is why a 12-cup machine fills about seven mugs.

How many tablespoons is 30 grams of coffee?

About 5.7 level tablespoons, since a tablespoon of medium-ground coffee weighs roughly 5.3 g. The figure drifts with grind size and roast level, which is why brewing by weight is more consistent.

Does the ratio change for cold brew?

Yes, substantially. A concentrate is brewed around 1:8 and diluted one-to-one when served; a ready-to-drink cold brew is made at about 1:15 and steeped for 12 to 18 hours in the fridge.

Coffee Ratio Calculator

Enter any two of coffee, water and ratio and get the third — in grams, tablespoons, millilitres and finished cups.

The Coffee Ratio Calculator runs entirely in your browser. Nothing you enter is uploaded.

Open the Recipe Scaler

About Coffee Ratio Calculator

A brew ratio is a weight ratio: 1:16 means one gram of coffee to sixteen grams of water. The arithmetic only stays honest in grams, because water is a convenient 1 gram per millilitre but ground coffee is not — which is why scooping by volume drifts as beans change roast and grind. The other half of the calculation is absorption. Wet grounds hold back roughly twice their own weight, so 500 g of water through 31 g of coffee leaves about 437 g in the cup, not 500. This calculator solves whichever of coffee, water or ratio you are missing, starts from the ratio each brew method is built around, and tells you how many actual mugs come out the other end.

Features

Solves for coffee, water or ratio from the other two
Starting ratios for drip, pour over, French press, AeroPress, moka, espresso and cold brew
Water entered in grams, millilitres, fluid ounces, mugs or carafe cups
Brewed yield after absorption, not just water in
Level tablespoons for brewing without a scale
Strength label from espresso through to under-extracted
Works backwards from the number of mugs you want
Everything computes on your device

How to use the Coffee Ratio Calculator

Pick the brew method to load its usual ratio
Choose which of coffee, water or ratio to solve for
Enter the two values you know, in whatever unit suits
Read the dose, the water and the finished yield

Example

Input

500 g water at 1:16

Output

31.3 g coffee ≈ 5.9 level tablespoons
Yield 437 g ≈ 1.8 mugs (8 oz) or 3.0 carafe cups

The grounds keep about 63 g — twice their own dry weight.

Common errors & troubleshooting

The carafe never fills to the line. — Absorption is the reason. Add water equal to about twice the dry coffee weight on top of the target yield, or use the mug figure here, which already accounts for it.
Coffee tastes thin and sour at the recommended ratio. — That is under-extraction, not weakness. Grind finer, use hotter water or extend the contact time before adding more coffee — a wider ratio with proper extraction beats a strong, sour cup.
The tablespoon figure disagrees with the scale. — A tablespoon of coffee is roughly 5.3 g, but it varies by grind and roast — a light roast ground coarse can be 30% off. Volume is a fallback; the scale is the measurement.

Frequently asked questions

What is the best coffee to water ratio?: Between 1:15 and 1:17 for filter coffee, with the golden cup standard sitting near 1:16.7. French press runs stronger at 1:12, espresso is about 1:2, and cold brew concentrate is 1:8 before dilution.
How much coffee do I need for a full 12-cup carafe?: A 12-cup carafe holds 12 five-ounce cups, about 1,775 ml. At 1:16 that means roughly 111 g of coffee, but you need to add water to cover absorption — about 1,995 g in total to actually fill the carafe.
Why do coffee machines measure cups as five ounces?: Carafe markings follow an old convention where a cup is 5 fl oz — smaller than the 8 fl oz measuring cup and much smaller than the mug most people drink from. It is why a 12-cup machine fills about seven mugs.
How many tablespoons is 30 grams of coffee?: About 5.7 level tablespoons, since a tablespoon of medium-ground coffee weighs roughly 5.3 g. The figure drifts with grind size and roast level, which is why brewing by weight is more consistent.
Does the ratio change for cold brew?: Yes, substantially. A concentrate is brewed around 1:8 and diluted one-to-one when served; a ready-to-drink cold brew is made at about 1:15 and steeped for 12 to 18 hours in the fridge.

Related tools

Cooking Measurement Converter — Convert cups, spoons, millilitres, grams and ounces using ingredient density.
Recipe Scaler — Scale any recipe by servings, a multiplier or a change of pan size.
Unit Price Calculator — Compare pack sizes by price per 100 g, 100 ml or piece and spot the real bargain.
Unit Conversion Calculator — Convert length, weight, temperature, volume, area, speed and more.
Pizza Size Calculator — Compare pizzas by area and price per square inch, and size an order for a group.
Sleep Calculator — Find the best bedtimes or wake times based on 90-minute sleep cycles.