Dose, water, yield and extraction

Coffee ratio calculator

Use mass for repeatability. CupTune rounds only after calculation and labels every approximation.

Start from a method

Or just type into the fields below.

Every number has a source

Calculate a brew

Edit the measurement you know. Extraction appears only when you supply a real TDS reading.

g

Measured dry dose.

1 : x

Water mass divided by dry dose.

g

Edit this or let dose × ratio derive it.

g/g

Editable assumption for filter beverage yield.

g

Use the scale reading when available.

%

Never estimated from taste or colour.

%

Must be below current TDS.

Measured versus assumed

Extraction yield is calculated only from dose, measured beverage mass and measured TDS. The 2 g/g absorption value is an editable planning assumption, not a measured property of every coffee. Strength is not extraction works through why those are two numbers.

Ratio and extraction, asked plainly

Why does extraction yield require TDS?

Extraction yield needs a measured dissolved-solids value. CupTune will not invent one from roast, colour, method or taste.

What is the difference between brew ratio and beverage ratio?

Brew ratio divides brew-water mass by dry-coffee mass. Espresso beverage ratio divides beverage mass by dry dose. They are different measurements and cannot be compared directly.

Why is my beverage mass less than the water I poured?

Ground coffee retains water. CupTune uses an editable 2 g per gram of dry coffee as a planning assumption for filter brews, which is an assumption rather than a property of your coffee.

Can I use ounces instead of grams?

The calculator works in grams because every formula on the site is a mass balance. Any consistent unit gives the same ratio, but mixing volume and mass is where recipes usually go wrong.