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Pool Pipe Size Calculator
Find the pipe diameter for a pool flow rate and a target water velocity.
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Free Pool Tool
Compare Your Options And Get Clear Answers
Find the pipe diameter for a pool flow rate and a target water velocity.
Pool Pipe Size Estimator
Enter your numbers below for an instant estimate.
0
π‘ Tip: Keep suction lines at or under 6 ft/s and returns under 8 ft/s.
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.
| Pipe | Max Flow gpm | Velocity | Use |
|---|---|---|---|
| 1.5 in | 40 | 8 ft/s | Small |
| 2 in | 70 | 8 ft/s | Standard |
| 2.5 in | 110 | 8 ft/s | Large |
| Rule of Thumb | Check inputs | Use as a guide | Round sensibly |
Common Questions
Pool Pipe Size Calculator FAQ
Answers to common questions about this calculator.
High speed causes noise and wear.
It gives a quick estimate of pool pipe size from the values you enter.
No. It is a planning estimate, so check important figures with a professional or official source.
Yes. Edit any field and the result updates when you calculate.