International Bitterness Units (IBU) Calculator

This utility lets one estimate a beer's IBUs using a hop's alpha acid percentage, quantity, and time in which it was added into the boil. The resulting graph shows the IBU contribution for a single ounce of each variety as a function of boil time as well as the IBU contribution of each addition.

Hop Definitions

Define up to eight hops to be used.

Hop Additions

Enter the hop schedule for the type, quantity, and boil duration for each addition.

Additional Information

Enter the boil volume and estimated original gravity (OG) of the wort.
Boil Volume   gallons   liters
Original Gravity