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Pool Filter Size Calculator
Size a pool filter from pool volume, turnover time and filter media flow rate.
🧹 Free Online Tool
⚡ Instant Results
📊 Clear Comparison
🔒 100% Free Tool
Free Pool Tool
Compare Your Options And Get Clear Answers
Size a pool filter from pool volume, turnover time and filter media flow rate.
Pool Filter Size Estimator
Enter your numbers below for an instant estimate.
0
💡 Tip: Oversizing a filter lowers pressure and extends cleaning intervals.
How It Works
Key concepts behind this calculator
1
Enter Values
Fill in each field with your own numbers.
2
Calculate
Results update as you change the inputs.
3
Review
Read the breakdown and the explanation.
4
Adjust
Change values to compare scenarios.
Quick Reference Guide
Pool Quick Guide
Typical values for reference.
| Media | Flow Rate | Typical | Note |
|---|---|---|---|
| Sand | 10 to 20 gpm/sq ft | Common | Backwash |
| Cartridge | 0.375 gpm/sq ft | Fine | Rinse |
| DE | 2 gpm/sq ft | Finest | Powder |
| Zeolite | 20 gpm/sq ft | Sand alt | Backwash |
| Rule of Thumb | Check inputs | Use as a guide | Round sensibly |
Common Questions
Pool Filter Size Calculator FAQ
Answers to common questions about this calculator.
Flow needed divided by media rate.
Time to circulate the volume.
Once per 8 hours.
Yes.