Coffee Ratio & Brew Count

When to use it

For a pour-over or filter-coffee water recipe weighed in grams. A brew count means identical recipes, not cups with a fixed volume. Keep your ratio and a short note with the calculation for later trials.

Inputs

Calculation method

Coffee per brew = planned water mass ÷ R. Multiply coffee and water by brew count for batch totals. Bloom water per brew = coffee per brew × chosen bloom multiple; subtract it from that brew’s water to get later water. With 300 g, two brews, 1:16 and a chosen 2× bloom, use 18.75 g coffee each, 37.5 g coffee total and 600 g water total. Each bloom uses 37.5 g; later water is 262.5 g.

300 [Planned water mass for each brew g]/16 [Water parts R for a coffee-to-water mass ratio of 1:R] → Coffee mass for one brew g

2 [Number of identical brews] × Coffee mass for one brew g → Coffee mass for all brews g

Planned water mass for each brew g × Number of identical brews → Water mass for all brews g

Coffee mass for one brew g × 2 [Bloom water as a multiple of coffee mass] → Bloom water for one brew g

Planned water mass for each brew g-Bloom water for one brew g → Later water for one brew, excluding the bloom g

Change one input

Change only the ratio from 1:16 to 1:15. Coffee per brew becomes 20 g and total coffee 40 g. Total water stays 600 g; bloom water becomes 40 g and later water 260 g for each brew.

Results are displayed to at most two decimal places; later formulas use unrounded values.

Scope and limits

• The ratio compares coffee mass with planned water mass.
• Bloom water is included in each brew’s total.
• Water in is not the final drink yield.

Water must be positive, brew count a positive integer, R positive and bloom multiple between 0 and R. The example ratio and bloom multiple are choices, not universal taste rules. Do not automatically treat grams as millilitres. This is not an espresso beverage-yield ratio or a cold-brew dilution model; it predicts no extraction, strength, time, grind or final drink volume.

Bloom is part of total water: Hario recipe.

Download and import into Calvance to edit the numbers. The canvas does not reject every invalid input; check the stated ranges.

Common questions

Is 1:16 always the best ratio?

No. Enter the ratio you want to test; method, beans and technique also affect the result.

Should I add bloom water to the total again?

No. It is already included. The later-water result is what remains after the bloom.

How to import your template

We recommend using the latest version of Calvance.

1. Save the file. Choose Download template and save the .calvx file to Files on your iPhone or iPad. From a computer, you can send it to your device with AirDrop.
2. Open Import. In All Canvases in Calvance, tap the add button to open the template screen, then choose Import.
3. Choose the file. Select the saved .calvx file to create your own canvas. Importing uses one canvas from your allowance.
4. Edit and check. Check the results against the worked example, then add your numbers. Duplicate the canvas to keep different versions.

Download .calvx file