Exothermic Heat Calculator
Estimate the peak temperature and heat risk when pouring resin, based on volume, resin type, and ambient conditions.
Inputs
oz
°F
Results
Estimated Peak Temp
166 °F
Risk Level
Low-Moderate — monitor closely
Temperature Rise94 °F
Time to Peak31 min
Total Heat (BTU)57.6 BTU
Resin TypeEpoxy (medium exotherm)
How to Use This Calculator
- Enter the pour volume in ounces — larger pours generate more total heat and risk cracking or yellowing.
- Enter the ambient temperature in °F; higher room temperatures accelerate the exothermic reaction.
- Set the mix ratio to match your resin's label (1:1, 2:1, or 3:1).
- Select the resin type: polyester (high exotherm), epoxy (medium), or urethane (low).
- Read the estimated peak temperature rise and time to peak to know when to monitor the pour.
- If peak temperature is unsafe, split into thinner layers or pre-cool the mold to reduce heat buildup.
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