This calculator will find the strike water temperature and volume to hit the target temperature of a single mash infusion.
First fill in the calibration data and click the Calibrate button. The calibration data are constant for a given brew vessel and can be reused for all future mash calculations. Then fill in the desired mash data and click the Calculate button.
If you are interested in how this works, take a look at the Mash Physics page which describes the process and equations.
Measure the temperature inside the brewing vessel and the ambient temperature.
Prepare a carefully measured volume of hot water, measure its temperature (T_{0}).
Add the hot water to the brewing vessel, put lid on, and take its temperature at 5 minutes (T_{5}) and 65 minutes (T_{65}).
Water Specific Heat  J/K/kg 
Water density @60°F  kg/L 
Grist Specific Heat (rel. water) 
^{†} 
Location:  Inside vessel  Ambient (Room)  

Temperature  °F  °F  
Water volume @60°F  US gallon  
Time:  0 minutes  5 minutes  65 minutes 
Water Temperature  °F (T_{0})  °F (T_{5})  °F (T_{65}) 
Input the mash batch data and click Calculate.


Strike water temperature  °F 
Strike water volume  
Heat loss at target temperature  W 
Mash end temperature  °F 