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Strike Temperature

Calculate the strike water temperature needed to hit your target mash temperature.

Calculates the water temperature needed to hit your target mash temperature.

How to Use

Enter the following values and the tool instantly calculates your strike temperature:

Input
Description

Room Temperature

The ambient room temperature

Grain Temperature

The current temperature of your grain (usually room temperature)

Mash Target Temperature

Your desired mash temperature, typically 64-70°C (148-158°F)

Mash Water Volume

The volume of strike water

Grain Amount

The total weight of your grain bill

Mash-Tun Heat Capacity

Your mash tun's heat capacity in L equivalent water volume. Set to 0 if your mash tun is pre-heated. Use the Mash-Tun Calibration tool to determine this value. Higher values calculate a higher strike temperature because the tun absorbs more heat.

Output

The tool displays the Strike Temperature -- the exact temperature to heat your water to before adding grain.

About Strike Temperature

Strike temperature is the temperature your water needs to be before adding grain to achieve your desired mash temperature. The grain absorbs heat from the water, so strike water must be hotter than your target mash temperature.

Factors Affecting Strike Temperature

  • Grain Temperature: Cooler grain requires hotter water

  • Water to Grain Ratio: More water retains heat better

  • Mash-Tun Heat Capacity: Equipment absorbs heat. Increasing this value increases the calculated strike temperature; decreasing it lowers the calculated strike temperature.

  • Target Mash Temperature: Your desired mashing temperature

  • Ambient Temperature: Affects heat loss

Common Mash Temperatures

By Style

  • Light/Dry Beers: 63-66°C (146-150°F)

  • Balanced Beers: 66-68°C (150-154°F)

  • Full-bodied Beers: 68-70°C (154-158°F)

  • Single Infusion: 67°C (152°F) typical

Enzyme Activity

  • β-Amylase: 60-66°C (140-150°F) - fermentable sugars

  • α-Amylase: 66-71°C (150-160°F) - dextrins/body

Water to Grain Ratios

Typical Ratios

  • Thick Mash: 2.1-2.6 L/kg (1.0-1.25 qt/lb)

  • Medium Mash: 2.6-3.1 L/kg (1.25-1.5 qt/lb)

  • Thin Mash: 3.1-4.2 L/kg (1.5-2.0 qt/lb)

  • BIAB: 5.2-8.3 L/kg (2.5-4.0 qt/lb)

Effects of Ratio

  • Thicker: Better enzyme preservation

  • Thinner: Better conversion efficiency

  • Temperature Stability: Thicker holds temp better

Preheating Your Mash Tun

Methods

  1. Hot Water Rinse: Add boiling water, swirl, dump

  2. Fill and Wait: Fill with hot water 10 min early

  3. Heat with Strike Water: Add extra hot water first

  4. Insulation: Wrap tun to maintain temperature

Benefits

  • More predictable results

  • Less heat loss to equipment

  • Easier temperature control

  • Set Mash-Tun Heat Capacity to 0

Step Mashing Considerations

Adding Hot Water

  • Calculate volume needed

  • Must be near boiling

  • Limited by tun capacity

  • Thins mash each step

Temperature Steps

  • Protein Rest: 50°C (122°F)

  • β-Glucan Rest: 40°C (104°F)

  • Saccharification: 64-70°C (148-158°F)

  • Mash Out: 76°C (168°F)

Practical Examples

Example 1: Standard Infusion

  • 4.5 kg (10 lbs) grain at 21°C (70°F)

  • Target: 67°C (152°F) mash

  • 14 liters (3.75 gallons) water

  • Strike Temperature: 73°C (164°F)

Example 2: BIAB

  • 5.5 kg (12 lbs) grain at 18°C (65°F)

  • Target: 68°C (154°F) mash

  • 30 liters (8 gallons) water

  • Strike Temperature: 70°C (159°F)

Troubleshooting

Missed Target Temperature

Too Low:

  • Add boiling water carefully

  • Stir well to distribute

  • Recalculate enzyme activity

  • If this happens repeatedly, verify grain temperature, room/mash-tun temperature, mash water volume, and thermometer accuracy, then recalibrate or increase Mash-Tun Heat Capacity if the tun is absorbing more heat than modeled

Too High:

  • Add cold water

  • Stir to cool

  • Wait if slightly over

  • If this happens repeatedly, verify the same inputs first, then recalibrate or lower Mash-Tun Heat Capacity. For a consistently preheated mash tun, use a value close to 0.

Mash-Tun Heat Capacity Direction

Use the Mash-Tun Calibration tool instead of applying an arbitrary strike temperature offset.

  • Higher Mash-Tun Heat Capacity = Brewfather assumes the tun absorbs more heat = higher calculated strike temperature.

  • Lower Mash-Tun Heat Capacity = Brewfather assumes the tun absorbs less heat = lower calculated strike temperature.

  • If your actual mash temperature is consistently too high, do not increase Mash-Tun Heat Capacity to lower the strike temperature. Check the temperature and volume inputs, then lower the value or preheat the tun and use 0 if that matches your process.

  • If your actual mash temperature is consistently too low, check the inputs, then increase the value when calibration shows the tun is absorbing more heat than currently modeled.

Heat Loss Issues

  • Preheat mash tun better

  • Improve insulation

  • Work faster

  • Account for ambient temperature

Tips for Success

  1. Measure Accurately: Use good thermometer

  2. Preheat Equipment: Consistent results

  3. Stir Well: Even temperature distribution

  4. Work Quickly: Minimize heat loss

  5. Take Notes: Track what works

Using with Your Equipment

  • Enter your specific Mash-Tun Heat Capacity value from the calibration tool

  • The tool remembers your last entered values

  • Track what strike temperatures work for your system

  • Recalibrate when equipment, insulation, preheating, or brewing environment changes

Related docs

PreviousHop Freshness
NextRest Temperature

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