Determine the right pool pump size for your swimming pool. Enter the pool volume and desired turnover rate to calculate the required flow rate in gallons per minute (GPM). A properly sized pump keeps your pool water clean and circulated efficiently without wasting energy.
Enter Your Measurements
Results
Recommended Pump Size
0.8
HP
Required Flow Rate
31.3
GPM
Max Flow (pipe limited)
31.3
GPM
Pipe Max Flow
43
GPM
Min Filter Size
2
sq ft
Formula
How to Use This Calculator
How to Use
- 1
Enter the pool volume in gallons (use the pool volume calculator if needed).
- 2
Enter the desired turnover time (8 hours is standard, 6 for spas or heavy use).
- 3
Enter the plumbing pipe diameter (1.5 inches for most residential pools).
- 4
Select your filter type for minimum filter size recommendation.
Frequently Asked Questions
Frequently Asked Questions
How many hours should a pool pump run?
Is a bigger pool pump better?
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About This Calculator
This calculator uses the formula: Required GPM = Pool Volume ÷ (Turnover Hours × 60) | Pipe max flow limits effective GPM. All calculations follow industry-standard methods. Results are estimates — always verify with a licensed professional for structural or code-compliant work.
Built and maintained by the CalcSmart team. Last updated March 2026.
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