Coffee Ratio Calculator

How to calculate coffee grams

1. Weigh the total water that will be used to brew. Include bloom water already counted in your recipe, but do not enter the weight of the finished drink.
2. Enter only the second number of the coffee-to-water ratio. For 1:16, enter 16; it means 16 g of brew water for each 1 g of dry coffee.
3. Read the coffee amount, then copy or print the qualified calculation if useful. Use a scale suited to your recipe and follow your brewer's instructions.

One coffee amount from two values

• Two blank inputs: brew-water weight in grams and your chosen recipe ratio.
• A single dry-coffee amount, with clear About or Less than wording when the display is not exact.
• Calculation details stay closed until you need the formula, input meaning or rounding explanation.
• No account, recipe upload, method selection or connection to a coffee machine is required.

When this recipe calculation helps

• Scaling a filter or immersion recipe that defines dry coffee against total brew water by weight.
• Finding the coffee dose for a known water amount without changing the recipe's chosen ratio.
• Checking how two ratios change the dry coffee needed for the same brew-water weight, one calculation at a time.

Read the ratio before scaling the recipe

A coffee-to-water ratio of 1:N means one part dry coffee to N parts brew water by weight. Divide the water weight by N; do not divide by N plus one.

Keep both ingredients on a weight basis. A cup or spoon is not a fixed coffee mass, and grams of water are not universally identical to millilitres at every temperature. This tool does not convert volume units.

Brew-water weight is an input to the recipe, not a prediction of beverage weight. Retention in grounds, evaporation, filtration, bypass water and later dilution are not calculated.

For fixed water weight, a larger N uses less dry coffee and a smaller N uses more. That arithmetic alone does not guarantee strength or taste; coffee, grind, water, extraction and technique still matter.

Worked coffee-ratio examples

At 1:16, 320 g of brew water needs 20 g of dry coffee: 320 divided by 16 is 20.

At 1:16, 500 g of brew water gives 31.25 g before display rounding. The calculator shows About 31.3 g, rounded to the nearest 0.1 g with halfway values upward.

A recipe using 50 g of coffee and 700 g of brew water has a 1:14 ratio. Keeping that ratio, 350 g of brew water needs 25 g of dry coffee.

At 1:16.5, 330 g of brew water needs exactly 20 g of dry coffee. Fractional ratios are allowed; enter 16.5 or its decimal-comma equivalent.

What this calculator does not predict

The answer scales the entered recipe by weight. It does not choose a universally best ratio, predict extraction or finished drink yield, or check a brewer's capacity.

Espresso recipes commonly compare dry dose with beverage output; that is a different convention. Do not put an espresso yield ratio into this brew-water calculation. No health or caffeine advice is provided.

Water must be positive and no more than 100000 g; N must be between 1 and 100. Both allow up to three decimal places. These are software limits, not recipe recommendations. Display resolution does not certify the accuracy of your scale.

Your recipe values stay in this tool

The calculator uses your two values in browser memory. It does not upload a recipe, save your entries, add them to the URL or send them to a coffee machine.

The surrounding website still loads its normal resources and services. Local arithmetic is not a claim that the whole page makes no network requests.