Coffee Ratio Calculator — Coffee-to-Water Ratio for Any Brew

Real-world use cases

• Brew a single V60 cup from the dose on your bag

  Your bag says a "standard cup" is 15 g, but you want a fuller mug. Set the ratio to 1:16, lock coffee, type 18 g, and read back 288 mL of water — about one and a quarter standard mugs. Now you know to fill the kettle just past the 280 mL line and you've turned a vague "one scoop" into a number you can repeat tomorrow and get the same cup.

• Scale a recipe to fit the water you actually have

  You inherited a half-full 1-liter kettle and don't want to refill. Lock water, type 750 mL, keep the ratio at 1:15 for a punchy French press, and the tool says grind 50 g. No mental division at 6 a.m. — you read the gram number, weigh it, and press start.

• Dial in espresso by brew ratio instead of guessing yield

  Your basket holds 18 g and you're chasing a 1:2 shot. Pick the espresso preset, lock coffee at 18 g, and the target yield reads 36 g. Pull until the scale hits 36, note the time, and adjust grind next shot. The ratio is the constant; everything else is a variable you tune against it.

• Batch cold-brew concentrate for a week of iced coffee

  You want a jar of concentrate to dilute all week. Tap the cold brew preset (1:8), lock coffee at 200 g, and it shows 1600 mL of water — fill the jar, steep 16 hours, strain. At serving time you'll cut it roughly 1:1 with water or milk, so one batch stretches to a couple liters of drinkable iced coffee.

• Translate an American recipe into grams for a kitchen scale

  A US blog gives the water in fluid ounces and you brew by weight. Lock water, switch the water unit to fl oz, type 20, and the tool converts to 591 mL while showing the matching coffee dose for your chosen ratio. No more wondering whether "ounce" meant weight or volume — it kept them straight for you.

Common pitfalls

• Confusing a weight-ounce with a fluid-ounce. Coffee is weighed (1 oz = 28.35 g); water is often measured by volume (1 fl oz = 29.57 mL). Plug an ounce of coffee in as if it were fluid ounces and your whole batch drifts. This tool keeps coffee in weight units and labels water units explicitly so you can't cross them by accident.

• Treating the cup count as a fill line. The cups number is derived from the water you pour, but grounds soak up roughly 2 mL per gram, so the liquid that ends up in your mug is a little less. Use the cup count to size a batch, not to predict the exact level in the cup.

• Chasing a 'perfect' ratio and ignoring grind and time. A 1:16 brew that runs through coarse grounds in 90 seconds tastes thin no matter how exact the ratio. Lock the ratio first, then adjust grind size and contact time — those move the cup far more than a half-point ratio tweak.

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