Coffee brewing calculator
Coffee-to-water ratios per brewing method, a recipe timer that calls out each pour with the weight the scale should read, and the extraction yield from a TDS reading, plotted on the SCA brewing control chart with brew-ratio lines.
Added
Works with
- Home bar Cooking and bakinguses the espresso in an espresso martini, a carajillo or an espresso tonic
How to use it
How to use it
Brew — pick a method (pour-over, flat-bottom pour-over, Chemex, French press, AeroPress, batch brewer, espresso, cold brew) and set the coffee and the ratio; the water follows (or type the water and the coffee follows). Each method starts from a common ratio, temperature and grind.
Recipe and timer — the steps for the method with the cumulative scale weight for each pour (tare with the coffee in the brewer). Press Start as the water hits the coffee: the big clock counts up, shows the current pour and what comes next, and chimes at each step. Sound, notifications and keeping the screen on are switchable.
Extraction (TDS) — enter a refractometer reading. For pour-over and batch brew weigh the drink (or Estimate from the water, assuming the grounds keep 2 g of water per gram); for immersion the water is used; for espresso the yield. The extraction yield is plotted on the SCA brewing control chart with lines for 45–75 g of coffee per litre; the notes say which way to adjust. ⛶ Full screen shows the chart large.
Limits
-
Method ratios, temperatures, grinds and step timings are common starting points, not standards. The SCA’s Golden Cup is 55 g per litre, 1.15–1.35 % TDS and 18–22 % extraction.
-
The chart is the classic SCA (Golden Cup) chart; the SCA’s newer research (2021) found preferences spread more widely. Ratio lines assume 2 g of water kept per gram of coffee.
-
The timer needs the page open and the screen on.
Related: kitchen conversions, timers.
Linking to an example
Weights in grams. Add the tab after #: brew or extract.
| Parameter | Meaning | Example |
|---|---|---|
|
|
|
|
Coffee, g |
|
|
Water (espresso: drink) per gram of coffee |
|
|
TDS % and the drink’s weight, g |
|
|
One of the presets below |
|
example= |
Shows |
|---|---|
|
A V60-style pour-over: 30 g coffee, 500 g water (open) |
|
A 1-litre French press at 1:15 (open) |
|
An 18 g espresso to 36 g (open) |
|
The SCA Golden Cup: 55 g/L, TDS 1.25 %: 20.2 % extraction (open) |
|
A sour cup: 20 g, 296 g out at 1.15 %: 17 % — under-developed (open) |
Feedback is a gift. Something to improve, a feature to add, or a bug? Tell me.
Runs entirely in your browser; nothing you type leaves this page.