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Pool Heater Size BTU Calculator
Size a pool heater in BTU per hour from surface area and desired temperature rise.
🔥 Free Online Tool
⚡ Instant Results
📊 Clear Comparison
🔒 100% Free Tool
Free Pool Tool
Compare Your Options And Get Clear Answers
Size a pool heater in BTU per hour from surface area and desired temperature rise.
Pool Heater Size BTU Estimator
Enter your numbers below for an instant estimate.
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💡 Tip: Heat pumps are efficient but slow. Gas heaters are fast but cost more to run.
How It Works
Key concepts behind this calculator
1
Enter Values
Fill in each field with your own numbers.
2
Calculate
Results update as you change the inputs.
3
Review
Read the breakdown and the explanation.
4
Adjust
Change values to compare scenarios.
Quick Reference Guide
Pool Quick Guide
Typical values for reference.
| Pool Size | Surface | Heater BTU | Type |
|---|---|---|---|
| 12×24 ft | 288 | 100k | Small |
| 16×32 ft | 512 | 200k | Medium |
| 20×40 ft | 800 | 325k | Large |
| Spa | 50 | 50k | Quick |
| Rule of Thumb | Check inputs | Use as a guide | Round sensibly |
Common Questions
Pool Heater Size Calculator FAQ
Answers to common questions about this calculator.
Surface area x rise x factor.
About 12 to 15.
Depends on climate and use.
Yes, up to a point.