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Coffee-to-Water Ratio Calculator

Find how much coffee to use for a target water amount and brew ratio.

Inputs

1 gram of water ≈ 1 mL.

Saved Scenarios

— select 2+ to compare

Coffee (grams)

37.5

Spark says

How it's calculated

Formula

Coffeeg=WatergRatioCoffee_g = \dfrac{Water_g}{Ratio}
Ratio
— The N in a 1:N coffee-to-water ratio

What is the Coffee-to-Water Ratio Calculator?

Specialty coffee brewing is commonly dialed in by weight ratio rather than volume scoops, since bean density varies — this calculator converts a target water weight and ratio directly into a coffee dose.

How to use it

  1. 1 Enter your target water amount in grams.
  2. 2 Choose your preferred brew ratio.

Worked examples

600g water, 1:16 ratio

About 37.5g of coffee.

Try it

Frequently asked questions

Why measure coffee by weight instead of scoops?

Coffee bean density varies by roast and grind size, so a 'scoop' can vary significantly in actual coffee weight — a gram scale gives a consistent, repeatable brew.