Pool Heater Sizing Calculator
Size a pool heater based on pool volume, temperature rise, surface area, and wind exposure using BTU calculations.
Inputs
gal
°F
°F
sq ft
Results
Recommended Heater Size
100,000 BTU/hr
Total BTU Required2,124,150 BTU
Initial Heat-Up Time21.2 hrs
Est. Monthly Operating Cost$132.00
How to Use This Calculator
- Enter your pool volume in gallons — use the Pool Volume Calculator if you don't have this figure.
- Set the current water temperature and your desired temperature in °F to calculate the required heat rise.
- Enter the pool surface area in square feet (length × width for rectangular pools).
- Set wind exposure: 0 = sheltered/covered, 1 = normal open yard, 2 = very exposed/elevated location.
- Review Required BTU and Heater Size to select a gas, heat-pump, or solar heater model.
- Check Initial Heat-Up Time and Monthly Operating Cost to compare heater types and plan energy costs.
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