IBU Calculator

Calculate hop bitterness (International Bitterness Units) for your homebrew recipes using the Tinseth formula. Perfect for recipe formulation and hop schedule planning.

IBU Calculator

Calculate hop bitterness using the Tinseth formula

Use average gravity during boil (typically between OG and pre-boil gravity)

Hop Additions

IBU Guidelines by Beer Style

Beer Style IBU Range
Light Lager, Blonde Ale 8 - 20
Wheat Beer, Hefeweizen 10 - 20
Amber Ale, Brown Ale 20 - 40
Pale Ale, ESB 30 - 50
IPA 40 - 70
Double IPA 60 - 100+
Stout, Porter 20 - 50
Imperial Stout 50 - 90

Understanding IBU Calculations

What is IBU? International Bitterness Units measure the concentration of iso-alpha acids (the bitter compounds from hops) in your beer.

Tinseth Formula: This calculator uses the widely-accepted Tinseth formula which accounts for boil time, gravity, and hop utilization.

Utilization: Longer boil times and lower gravities increase hop utilization (more bitterness extracted). A 60-minute boil typically gives maximum utilization.

Perceived Bitterness: IBU measures chemical bitterness, but perceived bitterness depends on malt sweetness. A 60 IBU IPA tastes more bitter than a 60 IBU Imperial Stout.

Hop Timing: Bittering hops (60+ min), flavor hops (15-30 min), aroma hops (0-10 min). Late additions contribute minimal IBUs but add flavor and aroma.

Hop Addition Tips

  • Bittering (60-90 min): Use high alpha acid hops for efficiency. Contributes most IBUs.
  • Flavor (15-30 min): Adds hop flavor with moderate bitterness contribution.
  • Aroma (0-10 min): Preserves delicate hop aromas, minimal IBU contribution.
  • Whirlpool/Hopstand: Steep hops at 80°C (176°F) after boil for aroma without excessive bitterness.
  • Dry hopping: Adds aroma and flavor post-fermentation with zero IBU contribution.

The Hop Shop offers a complete selection of brewing hops, hop pellets, and brewing ingredients.