Alpha Acid Calculator

Hops are natural produce whose bitterness can vary from season to season. The alpha acid % on the packet tells you how bitter they are — the higher the percentage, the more bitter, and so less is needed to achieve the same bitterness.

Use this tool to determine how much hops to use when substituting or when alpha acid differs from the recipe.

For multiple hops, use the Advanced Alpha Acid Calculator.

Original Weight

Original Alpha Acid (%)

New Alpha Acid (%)

New Weight: —

How to use

Example

I normally use 40g of hops at 4% alpha acid. But my new hops are 4.6% alpha acid. How much do I need to use now?

Enter the three known values into the boxes and press calculate. The new weight appears below.

Note

You do not have to work in grams — use any unit you like and the answer is returned in the same unit.

If you run out of hops half way through weighing, or want to mix varieties, use the Advanced Alpha Acid Calculator.