Grain Bill Estimator

Estimate mash or wash potential from a grain bill, batch volume, water volume, and mash efficiency.

This estimator assumes adequate starch conversion for converted mashes (for example, sufficient malted grain or enzymes where needed).

About This Calculator

• Maltster: “All” shows every ingredient. Selecting “Generic” or a specific maltster filters the list.
• Volume Used for OG: This is the liquid volume entering fermentation, not packaged beer volume after fermentation.

Batch Settings

Load Example
Maltster
Volume Mode	Manual Estimate from water and grain
Volume Used for OG		L US gal
Water Volume		L US gal
Grain Absorption		gal/lb L/kg
	Typical range: 0.10–0.15 gal/lb (default 0.12). Actual values vary with crush, drainage, and squeezing.
Efficiency Preset
Mash Efficiency (%)
Fermentable Mode	Converted mash / all fermentables Sugarhead / exclude grain sugars
Grain Bill Mode	Weight (lb/kg) Percentage (%) Target OG
Target OG
Total Bill Weight		lb kg
	In Target OG mode, enter bill percentages and a target OG. The calculator will estimate the required ingredient weights and total grain bill.

Grain Bill

Grain / Fermentable	Weight	Unit	Percent (%)	PPG	Remove

Add Ingredient Reset

Ingredient Notes & Guidance

Estimated Results

Total Bill Weight (kg)
Total Bill Weight (lb)
Final Volume (L)
Final Volume (US gal)
Total Gravity Points
Total Gravity Points Range
Estimated OG
Estimated OG Range
Estimated Plato
Estimated Brix
Potential ABV if Fermented Dry (%)
Potential ABV Range (%)
Water-to-Grain Ratio (L/kg)
Water-to-Grain Ratio (qt/lb)

Have a real measurement? Use the correction tool below to compare observed SG with calculated values.

Hydrometer Correction

Correct an observed hydrometer reading for sample temperature. Most hydrometers are calibrated to 60°F (15.6°C).

Observed SG
Sample Temperature		°F °C
Hydrometer Calibration Temp		°F °C
Corrected SG

Notes: Water Volume is optional, but if entered it is used to estimate mash thickness. Mash Efficiency affects mash-derived fermentables such as grains. In percentage mode, entered percentages are applied to total grain weight. In Target OG mode, entered percentages are used to calculate ingredient weights needed to reach the target OG at the selected volume. Direct fermentables such as sugar, syrup, honey, molasses, and extract are not reduced by mash efficiency. In Sugarhead mode, grain-derived fermentables are excluded from gravity calculations. Actual results vary with grain type, crush, drainage, squeezing, and process losses. Adjust settings to match your own process.