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Pool Heater BTU Sizing Calculator

BTU/h ≈ 8.34 · gallons · ΔT °F / hours.

Estimate the BTU/h heater output required to raise a swimming pool from its current to a target temperature within a desired number of hours: BTU/h ≈ 8.34 · gallons · ΔT °F / hours. The factor 8.34 = 1 BTU/lb·°F · 8.34 lb/gal water.

Marcus Laurent By Marcus Laurent
Published Last reviewed 1 min read

Inputs

gal
°F
°F
h

Results

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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

BTU/h ≈ 8.34 · gal · ΔT / hours

In depth

Estimate the BTU/h heater output required to raise a swimming pool from its current to a target temperature within a desired number of hours: BTU/h ≈ 8.34 · gallons · ΔT °F / hours. The factor 8.34 = 1 BTU/lb·°F · 8.34 lb/gal water.