Recipe
Scaling a recipe
A recipe written for 23 L, your kettle makes 30: enter it and the tool adapts it to your volume and your efficiency.
Result
Fill in the values and run the calculation, or try the example.
This is the calculation Krausi uses. Create an account to save it in a recipe or a brew.
Create my accountWhy adapt a recipe to your equipment?
Most published recipes match neither your volume nor your efficiency. Copying them as they are gives a different beer: thinner if your system extracts less well than the author's, more bitter if you brew a smaller volume with the same hops.
A simple rule of three is not enough. Grains must be corrected for volume and efficiency; hops, yeast and other ingredients for volume only. The tool applies the right rule to each line.
How is the recipe recalculated?
Two factors are calculated:
volume factor = target volume / original volume
grain factor = volume factor × original efficiency / target efficiencyGrains are multiplied by the second, all other ingredients by the first. Hops do not depend on efficiency: bitterness comes from the boil, not the mash.
Sugars and extracts dissolve completely, whatever the system: they too follow the volume only.
Worked example
Values entered
- Ingredients:
- ingredient name Pilsner, quantity 5, ingredient type Grain, unit of the quantity kg
- ingredient name Cascade, quantity 30, ingredient type hops, unit of the quantity g
- Volume of the original recipe in litres: 23
- Target volume in litres: 30
- Efficiency of the original recipe, from 0 to 1: 0.75
- Efficiency of the target system, from 0 to 1: 0.7
Result from the tool
- k = target volume / original volume
- 1.3
- k × original efficiency / target efficiency
- 1.4
- Adjusted recipe
Name Type Adjusted quantity Unit Pilsner grain 6.99 kg Cascade hops 39.13 g
What the tool does not do
- IBUs change slightly with the volume and the boil gravity: recalculate them after scaling.
- Boil and mash times do not change; boil-off, however, depends on your kettle.
- Yeast follows the volume: check the number of packs with the pitching rate.
Frequently asked questions
How do I scale a recipe from 20 to 40 litres?
If your efficiency is the same as the recipe's, double everything. Otherwise, enter both efficiencies: only the grains are corrected.
Should I double the hops?
Yes, hops follow the volume. Then check the IBUs: in a larger kettle, extraction can be a little better.
And with the assistant?
Ask Krausi the same question in plain language: he picks this tool, does the calculation and files the result in your project.
Scale my recipe from 23 L to 30 L, my efficiency is 70% and the recipe was written for 75%.
Done: grains are multiplied by 1.40 (5 kg of Pilsner becomes 6.99 kg) and the rest by 1.30 (30 g of Cascade becomes 39 g). I've created the “Pils 30 L” recipe in the same project.