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Strike Water Temperature Calculator

Estimate dry-grain mash-in water temperature with US or metric ratios, Fahrenheit or Celsius, an entered equipment adjustment and a local boiling limit.

Use this result well

Inputs that matter
Temperature unit, Water-ratio unit, Water ratio (US qt/lb), Water ratio (L/kg), and 8 more
Output to expect
Dry-Grain Mash-in Temperature Estimate
  • Check the units and required inputs before comparing results.
  • Keep the assumptions with a copied result so you can reproduce the calculation later.
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Reference & details

How it works

Use the coefficient with its stated ratio unit

The published initial-infusion shortcut uses 0.2 with water volume in US quarts per pound of dry grain. The old 0.4/qt-per-pound combination overstated the grain-heating increment. For a 152°F target, 65°F grain and 1.5 US qt/lb, the unadjusted estimate is 163.6°F.

Twater = Ttarget + (0.2 / Rqt/lb) × (Ttarget − Tgrain)

Source: Propagate Lab: Strike Water Calculation

Normalize ratios before changing temperature units

Metric ratios are divided by 2.086351… to obtain US qt/lb. The same dimensionless heating multiplier then works with Celsius temperatures. A Fahrenheit temperature difference is divided by 1.8; the 32-degree offset belongs only to absolute temperature conversion.

Source: NIST Guide for the Use of SI

Make equipment effects explicit

No automatic 2°F allowance is added. Zero shows the unadjusted shortcut; enter a correction only when supported by calibration for the same system and process. This is not a detailed vessel heat-capacity model.

Source: Craft Beer & Brewing: strike-water calculator formula

Check the model limits

The tool rejects estimates at or above the entered local boiling point, or at or below 0°C. The default 100°C / 212°F boiling point is a standard-pressure example. Verify your local value. Wet-mash step infusions, decoctions and direct heating need other models.

Updated: September 2026

Example Scenarios

Estimate dry-grain mash-in water temperature with US or metric ratios, Fahrenheit or Celsius, an entered equipment adjustment and a local boiling limit.

Compare physically equivalent US and metric inputs before using the result.

Save the calculation with units and the recipe or measurement assumptions.

Common Mistakes to Avoid

Using 0.4 with a qt/lb ratio

Normalize to US qt/lb and use the stated 0.2 shortcut coefficient.

Adding 32 when converting a temperature adjustment

Temperature differences use the 1.8 scale factor only.

Assuming every vessel needs a 2°F allowance

Use a supported correction for the actual system, or examine the unadjusted model and measure the outcome.

FAQ

It used 0.4 where the US qt/lb shortcut requires 0.2. With the same 152°F target, 65°F grain and 1.5 US qt/lb ratio, the unadjusted result is 163.6°F.

No. It simply omits a calibrated correction. Measure your system and verify the mixed-mash temperature.

Fahrenheit and Celsius each retain their own entered values. Confirm the displayed temperatures after switching; ratio units can be selected separately.

No. This shortcut is for an initial infusion into dry grain. Other materials and an already wet mash need different heat-balance models.

The tool rejects that result. Review the entered temperatures, ratio, adjustment and local boiling point; do not use an infeasible estimate as a heating instruction.

About Strike Water Temperature Calculator

Estimate a starting water temperature for a dry-grain initial infusion. The shortcut has explicit units and assumptions; verify the mixed-mash temperature rather than treating the calculation as an achieved result.