Batch Parameters
Hop Additions
| Hop Name | Weight | Unit | Alpha Acid % | Boil Time (min) | Action |
|---|
Results
IBU Scale
Hop Addition Breakdown
Add hop additions to see IBU breakdown
Beer Style Reference
Common beer styles and their typical IBU ranges and gravities.
| Beer Style | Typical IBU Range | Typical OG Range |
|---|---|---|
| American Light Lager | 5-10 | 1.035-1.042 |
| Pilsner | 25-45 | 1.044-1.055 |
| Wheat Beer | 10-20 | 1.044-1.052 |
| Blonde Ale | 15-28 | 1.038-1.054 |
| Pale Ale | 30-50 | 1.045-1.060 |
| IPA | 40-70 | 1.056-1.070 |
| Double IPA | 60-120 | 1.065-1.085 |
| Porter | 18-35 | 1.040-1.052 |
| Stout | 25-60 | 1.042-1.072 |
| Brown Ale | 20-30 | 1.045-1.060 |
| Belgian Dubbel | 15-25 | 1.062-1.075 |
| Belgian Tripel | 20-40 | 1.075-1.085 |
| Barleywine | 50-100 | 1.080-1.120 |
| Saison | 20-35 | 1.048-1.065 |
Understanding the Tinseth Formula
The Tinseth formula is the most widely used method for calculating IBU in homebrewing. It accounts for hop utilization based on boil time and wort gravity.
Formula Components
Where Gravity is the original gravity (e.g., 1.050) and Time is the boil time in minutes.
The result is the contribution of that hop addition to the total IBU.
- Boil Time: Longer boils extract more bitterness. A 60-min boil achieves ~25-30% utilization.
- Wort Gravity: Higher gravity reduces utilization. Lower gravity wort extracts bitterness more efficiently.
- Alpha Acids: Higher alpha acid percentage means more potential bitterness from the same weight.
- Batch Volume: Larger batches dilute the bitterness contribution of each hop addition.
BU:GU Ratio
The BU:GU ratio compares bitterness to gravity, helping balance your beer recipe.
For example, a beer with 40 IBU and 1.050 OG has a BU:GU ratio of 40 / 50 = 0.80.
- 0.3-0.5: Malty, sweet (e.g., Scottish Ale, Bock)
- 0.5-0.7: Balanced (e.g., Pale Ale, Amber)
- 0.7-1.0: Hoppy (e.g., IPA)
- 1.0+: Very hoppy (e.g., Double IPA, Imperial Stout)
Frequently Asked Questions
What is IBU?
IBU stands for International Bitterness Units. It measures the concentration of iso-alpha acids in beer, which come from hops during the boil. Higher IBU means more bitterness. Light lagers are typically 5-15 IBU, pale ales 30-50 IBU, and IPAs 40-100+ IBU.
How does the Tinseth formula work?
The Tinseth formula calculates IBU as: IBU = (mg/L of alpha acids) x utilization. Utilization depends on boil time and wort gravity. Longer boil times and lower gravities increase utilization. The formula is widely used by homebrewers for its accuracy.
What is a good IBU range for different beer styles?
Light lagers: 5-15 IBU. Wheat beers: 10-20 IBU. Pale ales: 30-50 IBU. IPAs: 40-70 IBU. Double IPAs: 60-100+ IBU. Stouts: 25-75 IBU. The BU:GU ratio (IBU divided by original gravity points) helps balance bitterness with malt sweetness.
Does boil time affect bitterness?
Yes. Longer boil times extract more bitterness from hops. A 60-minute boil typically achieves 25-30% utilization, while a 15-minute boil achieves about 12-15%. Hops added at flameout contribute minimal bitterness but maximum aroma and flavor.
Why does gravity affect hop utilization?
Higher gravity wort (more dissolved sugars) is denser and reduces the efficiency of hop acid isomerization. This is why high-gravity beers like Barleywines need more hops to achieve the same IBU as lower-gravity beers. The Tinseth formula accounts for this with a gravity correction factor.
What is alpha acid percentage?
Alpha acids are the compounds in hops that create bitterness when isomerized during boiling. Each hop variety has a typical alpha acid percentage (AA%), which varies by crop year. Common bittering hops like Magnum are 12-15% AA, while aroma hops like Cascade are 4-6% AA. This percentage is listed on hop packaging.
Can I add hops after the boil?
Yes, but post-boil hop additions (whirlpool, dry hopping) contribute minimal IBU. Whirlpool additions at 170-190F may contribute 5-15% of their potential IBU, while dry hops contribute negligible bitterness. These additions are primarily for aroma and flavor.
How accurate is the Tinseth formula?
The Tinseth formula is very accurate for most homebrewing scenarios and matches commercial brewing results within 10-15%. Other formulas exist (Rager, Garetz), but Tinseth is the most widely adopted. Remember that perceived bitterness also depends on malt sweetness, carbonation, and individual palate.
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IBU Bitterness Calculator FAQ
What is IBU?
IBU stands for International Bitterness Units. It measures the concentration of iso-alpha acids in beer, which come from hops during the boil. Higher IBU means more bitterness. Light lagers are typically 5-15 IBU, pale ales 30-50 IBU, and IPAs 40-100+ IBU.
How does the Tinseth formula work?
The Tinseth formula calculates IBU as: IBU = (mg/L of alpha acids) x utilization. Utilization depends on boil time and wort gravity. Longer boil times and lower gravities increase utilization. The formula is widely used by homebrewers for its accuracy.
What is a good IBU range for different beer styles?
Light lagers: 5-15 IBU. Wheat beers: 10-20 IBU. Pale ales: 30-50 IBU. IPAs: 40-70 IBU. Double IPAs: 60-100+ IBU. Stouts: 25-75 IBU. The BU:GU ratio (IBU divided by original gravity points) helps balance bitterness with malt sweetness.
Does boil time affect bitterness?
Yes. Longer boil times extract more bitterness from hops. A 60-minute boil typically achieves 25-30% utilization, while a 15-minute boil achieves about 12-15%. Hops added at flameout contribute minimal bitterness but maximum aroma and flavor.