SMaSH Beer Calculator — Single Malt And Single Hop
Calculate grain and hop amounts for a SMaSH recipe from your target OG and IBU.
Final volume into fermenter
Original gravity target (e.g. 1.050)
Bitterness in International Bitterness Units
Single malt for the grain bill
Single hop for bittering and aroma
How We Calculate This
Grain Calculation
Grain (kg) = Gravity Points / (PPG x Efficiency)
Gravity points = (OG - 1) x 1000 x Batch volume in US gallons
Hop Calculation (Tinseth)
Bittering hops (g) = (IBU x Volume x 10) / (AA% x Utilisation x 1000)
Utilisation assumes a 60-minute boil (~25%). Dry hops are specified separately and do not contribute significant bitterness.
Frequently Asked Questions
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Last updated: March 2026
All calculations are estimates. Always verify values and adjust based on your equipment and ingredients.