Mash Water Ratio Calculator

Summary

Enter your grain bill weight and target mash ratio to calculate strike water volume — or enter grain weight and water volume to find the actual ratio.

How it works

1. Select your unit system: US (qt/lb, gallons) or metric (L/kg, liters).
2. Choose a calculation mode: compute water volume from a target ratio, or compute the ratio from a known water volume.
3. Enter your total grain bill weight in pounds or kilograms.
4. Enter the target mash ratio (qt/lb or L/kg) or the water volume you plan to use.
5. The result shows water volume in the selected unit plus the ratio in both US and metric equivalents.
6. A warning appears if the ratio falls outside the typical brewing range (below 1.0 qt/lb or above 2.0 qt/lb).

Use cases

• Calculate how much strike water to heat before mashing in a single-infusion all-grain batch.
• Verify your planned water volume gives a workable mash thickness before brew day.
• Convert a recipe written in qt/lb to liters for a metric brew setup.
• Dial in mash thickness for high-adjunct or wheat-heavy grain bills that need thinner mashes.
• Check whether a thin or thick mash is appropriate for the beer style you are brewing.
• Reverse-engineer the mash ratio from notes taken during a previous batch.

Frequently Asked Questions