Free coffee calculators

Small tools for the numbers behind a brew. They work right here in your browser, with no app or account needed.

All tools

Brewing basics

Work out the coffee, the water, or the ratio from the other two, with presets for espresso, pour-over, French press, and cold brew.

Brewing basics

Turn a refractometer TDS reading into extraction yield and see where the brew sits on a brewing control chart.

Espresso

Check an espresso shot’s ratio, flow, and time, and get a first change to try if it tastes off.

Pour-over

Scale a bloom and three-pour pour-over schedule to your coffee dose and ratio.

Equipment

Convert a grinder setting written as rotations, numbers, and clicks into a single click count, and back.

Cold brew

Estimate how strong a glass of cold brew drinks after you add water or milk to the concentrate.

Coffee basics

Find out how many days a bag of coffee will last at your dose and number of brews per day.

Want the reasoning behind the numbers? Read the brewing guides.