Every recipe is written for a specific batch size. When yours differs, you need a scale factor to resize it. Enter the recipe size and your target below to get that factor and check an ingredient.
Calculate your scale factor
Using the scale factor
The scale factor is simply your target batch size divided by the recipe’s batch size. Multiply every ingredient by it and the recipe fits your volume. Enter one amount and the calculator shows you the resized figure as a quick check.
For scaling a whole ingredient list at once rather than one amount, use the Beer Recipe Calculator, which shares the same maths.
Batch size and your real volumes
Batch size here means the finished volume the recipe targets, usually the amount into the fermenter. If your kettle losses and boil-off differ from the original brewer’s, your grain and water needs will shift slightly.
The Strike Water Calculator’s water plan helps you dial in your actual mash, sparge and total water for the new size.
Frequently asked questions
How is the scale factor worked out?
It is simply your target batch size divided by the recipe batch size. Multiply every ingredient by that number and the recipe fits your new volume.
How is this different from the recipe calculator?
This one gives you the single scale factor and resizes one amount as a quick check. The Beer Recipe Calculator scales several ingredients at once. They use the same underlying maths.
Should I account for boil-off and losses?
Batch size here means the volume the recipe is written for. If your losses differ, use the Strike Water Calculator water plan to dial in your actual volumes.
More homebrewing calculators
This is one tool in the full homebrewing suite. Whatever stage of the brew you are at, there is a calculator for it.
