Strike Temperature Calculatorv1.0.0

Use this calculator to determine the temperature your strike water (brewing liquor) must reach before you add it to your grain. When hot water meets room-temperature malt, the mixture settles at a lower temperature than the water alone. Knowing the correct strike temperature prevents undershooting or overshooting your target mash rest, which directly affects enzyme activity, fermentability, and the body of the finished beer.

• Select your preferred Temperature Unit (Fahrenheit or Celsius) from the dropdown.
• Enter the Target Mash Temperature you want to achieve after combining water and grain. Common single-infusion targets range from 148 to 158 degrees Fahrenheit (64 to 70 degrees Celsius).
• Enter the Grain Temperature, which is usually room temperature (around 68 degrees Fahrenheit or 20 degrees Celsius). If you store grain in a cold garage or basement, measure it and enter the actual value.
• Choose a Weight Unit (pounds or kilograms) and enter the total Grain Weight from your recipe.
• Select the Ratio Unit (quarts per pound or liters per kilogram) and enter your desired Water-to-Grain Ratio. A typical range is 1.0 to 2.0 qt/lb (2.1 to 4.2 L/kg). Thicker mashes favor body; thinner mashes favor fermentability.
• Click Calculate or simply let the auto-calculate feature update the result as you type.
• Open Settings to adjust the Grain Thermal Constant (default 0.2) or to enable the Show step-by-step derivation checkbox for a detailed formula breakdown.
• Click Reset to clear all saved values and return every field to its default.

The underlying formula is: Strike Water Temperature = (Thermal Constant / Ratio) x (Target Temperature - Grain Temperature) + Target Temperature. All inputs accept decimals, fractions (such as 3/4), and mixed numbers (such as 1 1/4).

Accurate strike water temperature is fundamental to repeatable all-grain brewing. This calculator serves brewers across a range of experience levels and brewing setups.

• Single-Infusion Mashing: Calculate the one water addition temperature needed to hit a 152 degrees Fahrenheit saccharification rest with 10 pounds of grain at a 1.25 qt/lb ratio. Get a precise strike temperature instead of guessing and adjusting on the fly.
• Cold-Weather Brewing: When grain is stored in an unheated garage at 50 degrees Fahrenheit, the strike water must be significantly hotter than normal. Enter the actual grain temperature to avoid a low mash that produces a thin, overly fermentable wort.
• Brew-in-a-Bag (BIAB): BIAB setups often use higher water-to-grain ratios (around 1.5 to 2.0 qt/lb). Enter the higher ratio to see how it reduces the required strike temperature compared to a traditional mash tun approach.
• Metric Brewing: Switch to Celsius and liters per kilogram for international recipes. Enter 66 degrees Celsius as the target with a 3.0 L/kg ratio and 5 kilograms of grain to get the strike temperature in metric units.
• Recipe Development: Compare strike temperatures across different mash profiles (148 degrees Fahrenheit for a dry beer versus 158 degrees Fahrenheit for a full-bodied beer) using the same grain bill to plan your brew day heating schedule.
• Specialty Grain Adjustments: Wheat, oats, or unmalted adjuncts have slightly different thermal properties. Open Settings and adjust the Grain Thermal Constant from the default 0.2 to fine-tune calculations for non-standard grists.
• Education and Homebrew Clubs: Walk new brewers through the relationship between grain temperature, water ratio, and strike temperature using the step-by-step derivation toggle to show the math behind each result.