Strike Water Calculator

Strike water is the hot water you add to your grain to start the mashing process. Its temperature matters because the water cools when it contacts the cooler grain, and you need the final mixture to land at your target mash temperature. Too hot and you risk denaturing enzymes; too cool and conversion will be incomplete or slow.

This calculator uses the standard Palmer formula: Strike Temp = ((0.2 / R) × (Target Mash Temp − Grain Temp)) + Target Mash Temp + Equipment Loss, where R is the water-to-grain ratio in quarts per pound. This accounts for the thermal mass of the grain and any heat loss from your equipment.

For traditional single-infusion mashing, a ratio of 1.25–1.75 quarts per pound (about 2.6–3.6 liters per kg) is standard. Thinner mashes (higher ratio) favor more fermentable wort, while thicker mashes can improve body and mouthfeel. Brew-in-a-Bag setups often use much higher ratios of 2–4 qt/lb.

Cooler grain requires hotter strike water to compensate, because more heat energy is needed to warm the grain to your target mash temperature. In winter, grain stored in a cold garage might be 50°F, requiring significantly hotter strike water compared to grain at a warm room temperature of 70°F.

For most ales, 148–156°F (64–69°C) is the typical range. Lower temps (148–152°F) produce a more fermentable, drier beer, while higher temps (154–158°F) leave more unfermentable dextrins for a fuller body. Lagers often mash slightly cooler around 145–152°F for a crisper profile.

Equipment heat loss accounts for heat your mash tun absorbs before the water and grain equilibrate. An unheated aluminum or stainless tun might absorb 2–5°F worth of heat. If you pre-heat your mash tun with hot water before brewing, set this to 0. If not, add 2–5°F depending on your vessel size and material.

Grain absorption is how much water your grain soaks up and retains during the mash — water that never makes it into your kettle. The standard value is about 0.125 gallons per pound (roughly 1 quart per pound, or 1 liter per kg). Finer crushes and adjuncts may absorb slightly more; a coarser crush slightly less.

Yes — select 'Brew-in-a-Bag (BIAB)' as your brewing setup. BIAB typically uses a full-volume or near-full-volume mash with a higher water-to-grain ratio (often 2–4 qt/lb). The same strike temperature formula applies; the main difference is you use all your water upfront with no separate sparge step.