The Pellet to Whole Hop Conversion tool rescales a hop addition when you have to substitute one hop format for another. Because pellet hops bitter more efficiently than whole cones or plugs, a straight gram-for-gram swap will leave your beer too bitter or too soft — this tool applies the standard utilization bonus to keep bitterness on target.
How it works
Pellet hops are ground and pressed, which breaks open the lupulin glands and exposes far more alpha acid to the boiling wort. The widely used rule of thumb is that pellets isomerise roughly 10–15% more efficiently than whole-cone or plug hops.
To convert whole to pellet you reduce the weight by the bonus:
pellet weight = whole weight ÷ (1 + bonus)
To convert pellet to whole you increase the weight by the bonus:
whole weight = pellet weight × (1 + bonus)
With a 10% bonus, 2 oz of whole hops is equivalent to 2 ÷ 1.10 ≈ 1.82 oz of
pellets, and 1 oz of pellets is equivalent to 1 × 1.10 = 1.10 oz of whole
hops.
Choosing the bonus
A 10% bonus is the most common default and works well for bittering additions. Some brewers push toward 15% for late, whirlpool, and dry-hop-adjacent additions where the pellet advantage in utilization and surface area is larger. Plugs are compressed whole cones and convert exactly like whole hops.
Example and notes
If a recipe lists 1.5 oz of whole Cascade and you only have pellets, a 10% bonus
gives 1.5 ÷ 1.10 ≈ 1.36 oz of pellet Cascade for the same bitterness. The
conversion only adjusts for utilization efficiency — it does not change the hop’s
alpha acid percentage, so always pair it with the actual AA% printed on each
package when planning a recipe.