Pool Filter Sizing Calculator
Enter pool gallons, your chosen turnover period, the exact filter model, and its manufacturer-documented maximum flow rating with a source URL. The tool calculates gallons ÷ (hours × 60) and checks whether that flow exceeds the rating you entered.
Illustrative example: A 20,000 gallon pool over 8 hours needs about 41.67 GPM for that mathematical period. Being below a filter's entered ceiling does not verify plumbing, pressure, media, heater requirements, or complete system suitability.
Read the pool filter guide for filter types and service context.
Explore filter options
Check the whole circulation system
A filter comparison is one step in equipment selection. Confirm actual pump flow, plumbing restrictions, filtration area, maintenance access and the limits of connected equipment before purchasing.
Pool Filter Sizing
Compare the flow your pool needs with the published flow rating for the exact filter model you select.
A ceiling comparison only. The model's flow rating alone does not validate plumbing, system flow, filter media, pressure, or suitability.
