Scientific Cooling Calculator

Heat Input and Cooling Calculator for Injection Molding

We offer this Mold Cooling Calculator tool as a free service to the injection molding industry. While some molds or inserts have simple, straightforward cooling circuits, many have multiple circuits of various sizes and configurations. In these cases each circuit might remove a different percentage of the heat input. Users must therefore employ this tool with awareness and judgment. Trying out different molding and cooling variables is simple and quick. In complex cooling schemes one can easily analyze each cooling circuit separately and combine the results. We are eager to learn how you have used the calculator and to hear your constructive feedback so we can enhance and improve the utility of the Smartflow Scientific Cooling Calculator.

Select Material From Drop Down Polymer List:
(AM = Amorphous, SC = Semi-Crystalline)

Heat Capacity:

BTU/lb. °FkJ/kg-°C

Latent Heat of Fusion:


Material Processing Temperaure:


Maximum Safe Ejection Temperature:


 Manually Enter Processing and Ejection Temperatures

Enter Molding Variables

Cycle Time:


Shot Weight:

Molding Room Temp.:


Calculated Energy required to heat material from room temperature to processing temperature:

BTU/lb: kJ/kg: 

BTU/shot: kJ/shot: 

BTU/hr: kJ/hr: 

Calculated Energy required to cool part from processing to ejection temperature:

kJ/hr BTU/hr
( Refrigeration Tons)

Enter Cooling Parameters

Desired Reynolds Number:

Water Temperature:


Coolant ΔT/incm:


Cooling Circuit Diameter:


Cooling Calculation Results

Print Results Calculate Results



Minimum Required Cooling Circuit Length: