Coffee Brew Calculator

There are a few easy calculations we need for brewing coffee but which can be tricky to get right. Here we have 3 types of calculation the app does for you:

Converting Dose, Water In, TDS and Extraction

These 4 factors are inter-related. Rather than have 4 different calculators, just select which you want to calculate from the other 3. The Brew Ratio is also calculated along with the Brew Mass

These calculations use "grams of water per gram of coffee" which is conventionally set to 2. If you have some other figure, you can enter it in the gwgc box.

We can also view these (your calculated point is the red dot) in a brew chart - with Extraction on the x-axis, TDS on the y-axis and either Ratio or (check the g/l option) g/l as the slanting lines. Moving around the graph you get readouts of any point of interest. You can also get a Legend showing the colour-coded lines via the Legend option.

Real weight, Effective dose

If you want to be very precise, then you need to account for % Moisture & %CO2 in the beans. You take the Dose and g Water from the previous calculation.

Final temperature

You add your hot Water at a known Temperature to a Vessel of a certain weight, containing a certain Dose of coffee, each assumed to be at your defined Ambient temperatures. Assuming no loss of heat via convection or evaporation, the final temperature depends on the initial temperatures, relative weights and specific heats of water, vessel and grounds. The specific heats in the calculation are typical values for beans and (glass) vessels.

Recording results

The calculated values are automatically placed onto the Clipboard each time you make a calculation. Go into your favourite spreadsheet, type Ctrl-V to paste, and they are each in their own cell.