Coffee Ratio Calculator

Enter your coffee dose or water volume and a target brew ratio to get the exact matching amount, in grams and milliliters.

Quick Facts

Method
Direct ratio math: water = coffee × ratio (by weight)
1g of water ≈ 1ml, so the water figure works as both a weight and a volume.

Your Results

Calculated
Coffee (dose)
-
Grams of ground coffee
Water
-
Grams (≈ milliliters)
Ratio used
-
Coffee : Water
Total brewed weight
-
Coffee + water, before absorption loss

Ready

Choose a brew method or enter your own ratio, then calculate.

How the coffee ratio calculation works

A coffee ratio expresses how much water you brew against how much ground coffee you use, measured by weight. It's written as coffee:water — for example, 1:16 means 1 gram of coffee for every 16 grams of water. Because 1 gram of water occupies almost exactly 1 milliliter at room and brewing temperatures, the water figure doubles as both a weight (grams, for a scale) and a volume (milliliters, for a jug or kettle) without any conversion needed.

The formula

The math is simple multiplication or division, not a blend of arbitrary factors:

  • If you know the coffee dose: water (g) = coffee (g) × ratio. Example: 20g coffee at a 1:16 ratio needs 20 × 16 = 320g (320ml) of water.
  • If you know the water volume: coffee (g) = water (g) ÷ ratio. Example: 500g (500ml) of water at 1:15 needs 500 ÷ 15 ≈ 33.3g of coffee.

Typical ratios by brew method

These are the benchmark ranges baristas and coffee professionals commonly cite, all by weight:

  • Drip / pour-over (V60, Chemex, Kalita): 1:15 to 1:17, with 1:16 as a widely used default.
  • French press: around 1:15 for a full-bodied cup.
  • Espresso: roughly 1:2, meaning an 18g dose yields about 36g of liquid espresso in the cup (the "brew ratio" for espresso, not the water added to the machine's boiler).
  • Cold brew concentrate: about 1:8, steeped for 12-24 hours, then typically diluted 1:1 with water or milk before drinking.

Why ratio matters more than "scoops"

A tablespoon or scoop of coffee varies in weight depending on grind size, bean density, and roast level — a coarse cold-brew grind and a fine espresso grind can differ by several grams per scoop even at the same volume. Because the ratio formula uses weight on both sides, it stays accurate regardless of grind setting, roast, or bean origin. This is why professional baristas weigh both coffee and water rather than counting scoops or using marked lines on a carafe.

Ratio is only one variable

Ratio controls strength (how concentrated the brew is), but flavor balance also depends on grind size, water temperature (generally 90-96°C / 195-205°F for most methods), and contact time. Two cups brewed at the identical 1:16 ratio can still taste very different if one is under-extracted (sour, thin) or over-extracted (bitter, harsh) due to grind or time differences. Adjust ratio first to dial in strength, then adjust grind/time to dial in extraction.

Frequently Asked Questions

What is the best coffee-to-water ratio?
For most drip, pour-over, and French press brewing, a ratio between 1:15 and 1:17 (coffee:water by weight) is standard, with 1:16 as a common starting point. Espresso uses a much stronger ratio, typically 1:2. Cold brew concentrate uses roughly 1:8. Personal taste varies, so use these as a starting point and adjust from there.
Should I measure coffee and water by weight or volume?
Weight is far more accurate. A gram of water is essentially 1 milliliter, but coffee beans vary in density depending on roast and grind, so a scoop or tablespoon of coffee can vary by several grams. A digital kitchen scale removes that guesswork and is the single biggest upgrade for consistent brewing.
Does the ratio account for water absorbed by the grounds?
No — the ratio describes what you pour in, not what ends up in the cup. Ground coffee absorbs roughly 1.5-2 grams of water per gram of coffee (this is sometimes called "bloom" or grounds absorption), so your final brewed beverage will weigh somewhat less than coffee + water combined. This calculator reports the input amounts; adjust your yield expectations accordingly if you need an exact final cup volume.

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