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Pool Pump GPM Calculator

Calculate required gallons per minute from pool volume, turnover time, and water-feature demand.

Estimated result:
Planning estimate: Confirm equipment specifications, performance tables, warranties, local requirements, and site conditions before purchasing or changing equipment.

How This Calculator Works

Enter realistic values from your pool, equipment labels, utility bill, or written estimate. Change an assumption to see how it affects the result.

What Matters Most

Turnover math is only one flow target. Heaters, chlorinators, water features, cleaners, skimming, pipe velocity, and filter ratings may set a different minimum or maximum.

A pump must produce the target flow at the system’s actual total dynamic head. GPM cannot be chosen reliably from horsepower alone.

Common Mistakes

  • Using advertised maximums instead of performance at actual operating conditions.
  • Ignoring plumbing, filter, heater, sanitizer, automation, or electrical limits.
  • Rounding inputs before the final result.
  • Treating a planning estimate as a substitute for manufacturer instructions.

Frequently Asked Questions

Should I use measured values?

Yes. Measured flow, watts, pressure, dimensions, and current pricing usually improve the estimate.

Is the largest option always best?

No. Equipment should meet the required range without violating minimum flow, maximum flow, velocity, electrical, space, or compatibility limits.

Pool Gal Pro Tip 💦

Write down the clean, working baseline when equipment is new. Future-you will look brilliant when troubleshooting season arrives.