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Coffee brew ratio calculator

Dial in a brew from a coffee-to-water ratio: enter the grams of coffee and your ratio (1:15–1:17 for pour-over, 1:12 for French press) to get the water in grams — which for water is also millilitres.

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Enter Coffee (g), Ratio 1 : X and the Coffee brew ratio calculator works out Water (g / ml), Approx. brewed volume (ml) straight away. For instance, with Coffee (g) = 18 and Ratio 1 : X = 16 it returns Water (g / ml) = 288 and Approx. brewed volume (ml) = 252.

How to use it

  1. Enter your values: Coffee (g), Ratio 1 : X.
  2. Read the result instantly: Water (g / ml), Approx. brewed volume (ml).

Frequently asked questions

How does the Coffee brew ratio calculator work?

It takes Coffee (g) and Ratio 1 : X and derives Water (g / ml) and Approx. brewed volume (ml) from them. The calculation is live as you type, so the result updates on every change.

Which values does the calculator ask for?

2 values: Coffee (g) and Ratio 1 : X. Nothing else is required — no account, no file upload.

What does a typical calculation look like?

With Coffee (g) = 18 and Ratio 1 : X = 16, the calculator returns Water (g / ml) = 288 and Approx. brewed volume (ml) = 252. Those figures come from running this exact tool, so you can reproduce them by entering the same values.

How much does the result change with different inputs?

It moves a lot. Using Coffee (g) = 36 and Ratio 1 : X = 32 instead, Water (g / ml) goes from 288 to 1,152 — which is why it is worth testing a few scenarios rather than trusting a single figure.

What does it give for smaller values?

Scaled down to Coffee (g) = 9 and Ratio 1 : X = 8, Water (g / ml) comes out at 72. The relationship is worth checking at both ends before you rely on a single result.

When would I actually use this?

Cooking from a recipe that does not match your kitchen: scaling for a different number of people, converting cups to grams, and substituting what you do not have.

What is the most common mistake?

Converting a cup as if it were a volume of weight. A cup of flour and a cup of sugar differ by nearly a third in mass, so a single conversion factor gets one of them badly wrong.

What is the difference between the Coffee brew ratio calculator and the Rice to water ratio calculator?

This one returns Water (g / ml) and Approx. brewed volume (ml); the Rice to water ratio calculator returns Water (cups). That is the whole difference — open the one whose figure you need.

Is there a tool for the next step?

Brine calculator is the closest one after this: Work out how much salt you need for a brine at a target concentration.

What else is worth having open alongside it?

Pasta Portion Calculator and Pizza dough calculator — they come up in the same task often enough to be worth a second tab.

Further reading

All guides →
How-toThe Perfect Coffee-to-Water Ratio (the Golden Ratio Explained)The golden ratio is roughly 1:16 — learn grams of coffee per cup and how to adjust strength to your taste.How-toHow Much Ground Coffee Per Cup? The Golden RatioThe golden ratio for coffee is about 1:16 by weight — roughly 1 tablespoon of grounds per 6 oz cup. Learn how to measure coffee in grams and tablespoons for a balanced brew.ExplainerWhat a Daily Coffee Habit Costs Over a YearThe number is large because it is a daily number multiplied by 260 or 365 — and the same arithmetic works on anything daily, which is the part worth keeping. With the home-brewing comparison done properly, and a plain statement of what the number is not.How-toHow Much Rice Per Person? Portions and WaterA good rule for rice is about 75 g of dry rice per person as a side, or 90 g as a main. Learn the standard water ratio and how to scale rice for any number of people.How-toThe Right Rice-to-Water Ratio for Every Type of RiceLearn the exact water ratio for white, brown, basmati and jasmine rice using the absorption method — no measuring guesswork.ComparisonWhich Pizza Size Is the Best Value? The Answer Is GeometryArea grows with the square of the diameter, so an 18-inch pizza is not half as big again as a 12-inch — it is more than twice. Price per square inch settles the argument; the crust and the toppings complicate it.