Coffee-to-Water Ratio Calculator
Find how much coffee to use for any brew strength and water volume.
Assumptions used in this calculation
- 1ml water ≈ 1g: Water volume in milliliters is treated as equal to its weight in grams (water's density is ~1g/ml), so the ratio works directly as coffee grams : water ml.
About this calculator
Brewing consistently good coffee depends on getting the coffee-to-water ratio right, but scaling that ratio to whatever pot or carafe size you're using — 750ml, a liter, a single mug — means dividing on the fly rather than eyeballing scoops, which is a common source of coffee that's too weak or too strong. This calculator takes your water volume and a chosen brew ratio (like 1:15 or 1:17) and computes exactly how many grams of coffee to use, based on the formula coffee grams = water (ml) ÷ ratio divisor, treating water's density as effectively 1ml = 1g. It doesn't account for the small amount of water absorbed by the grounds during brewing (bloom), so your finished beverage volume will end up slightly less than the water you started with — that's normal and expected, not an error in the calculation. Rather than guessing with a scoop or estimating proportionally by eye, this gives a precise gram measurement scaled to your exact water volume and desired strength, useful for dialing in a consistent pour-over or drip brew.
Worked example
750ml water at 1:15
Result: 50g coffee
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