Homebrewing Recipe Calculator
Estimate all-grain recipe scaling from batch size, grain bill, efficiency, target OG, and total hop additions.
Last updated: 2026-03-27
Homebrewing recipe calculator
Enter your values
Estimate whether your grain bill and hop bill still make sense after choosing a batch size and target gravity.
Required Grain Bill
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Enter batch size, grain bill, efficiency, target OG, and total hops to estimate the scaled recipe.
Calculation History(0)
Example calculations
Tap an example to prefill the calculator with sample values.
Balanced pale ale
5.5 gal, 11.5 lb grain bill, 1.056 target OG
A practical baseline for all-grain batch planning where you want a quick recipe-scaling cross-check.
Result: The current grain bill lands close to the target gravity, so hop scaling stays modest
Bigger IPA target
6 gal batch aiming for 1.070
Useful when a stronger beer pushes the grain bill and hop bill upward together.
Result: Higher gravity needs a larger grain bill and a noticeably scaled hop total to stay balanced
How the homebrewing planning model works
The calculator turns your grain bill and efficiency into estimated gravity points, compares that against the target original gravity, and solves for the grain bill needed to hit the target at the selected batch size.
It then scales the total hop bill with the same factor and uses a 75% apparent attenuation assumption to produce a quick FG and ABV estimate. That keeps the tool useful for recipe planning without pretending to replace full brew software.
Homebrewing recipe FAQs
Use the output to plan a batch, not to replace detailed brew-day software or tasting feedback.
How is the required grain bill estimated?
The calculator uses a simple gravity-points approach: base-malt shorthand of 36 points per pound per gallon scaled by brewhouse efficiency. It is a planning model, not a full mash or lauter simulator.
Why are hop additions scaled proportionally?
Because the first job in a lightweight recipe planner is preserving broad recipe balance as gravity and grain bill move. Real hop utilization still depends on timing, alpha acids, boil vigor, and wort gravity.
Is the ABV result exact?
No. The page uses a documented 75% apparent attenuation assumption to create a directional FG and ABV estimate. Yeast strain, mash profile, and fermentation management can move the real beer away from that number.
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