Coffee-to-Water Ratio Calculator

Choose whether you know the coffee weight, brewing-water amount, or number of servings.

Select a method starting point or enter a custom ratio.

Enter the available amount. For serving mode, also enter the brewing water planned for each serving.

The calculator returns the complete coffee and water recipe.

A coffee ratio written as 1:16 means one gram of ground coffee for every 16 grams of brewing water.

Thirty grams of coffee at 1:16 therefore requires 480 grams of water.

The ratio scales without changing when the batch becomes larger or smaller.

Weight provides a repeatable relationship between the coffee and brewing water.

Cups, scoops, and tablespoons can vary with container size, grind, filling technique, and local measurement conventions.

A scale also makes it easier to reproduce a successful recipe or make a precise adjustment.

The method selector supplies convenient planning ratios, but it does not define one correct recipe for each brewer.

AeroPress recipes vary by brewer size, coffee dose, dilution, temperature, and technique.

Cold brew may be prepared ready to drink or as a stronger concentrate that is diluted later.

Serving mode multiplies the number of servings by the entered brewing water per serving.

The resulting total water is divided by the selected ratio to calculate the required coffee.

Coffee cups and mugs do not have one universal volume, so enter the actual amount you intend to brew per person.

The calculator uses the practical brewing approximation that one gram of water occupies about one millilitre.

Actual water density changes slightly with temperature, but the approximation is suitable for ordinary coffee recipe planning.

US fluid ounces and cups are calculated from the approximate millilitre result.

The result shows water poured into or added to the brewer.

Coffee grounds retain part of that water, and some liquid may remain inside the brewer or filter.

The final beverage therefore normally weighs less than the total brewing-water input.

Using less water for the same coffee dose creates a more concentrated recipe. Using more water creates a less concentrated recipe.

Taste is also affected by grind size, brewing time, water temperature, water chemistry, agitation, roast, and brewer design.

Change one variable at a time and record the result when refining a recipe.

The calculation runs entirely in the browser.

Coffee quantities, water values, ratios, and serving counts are not uploaded or permanently stored.