Pipe Size Calculator
Calculate required pipe diameter based on flow rate and desired velocity. Includes recommendations for copper, PVC, and steel pipes.
34.3Kuses
7.6/10(221)
Recommended Pipe Size
1"
Inner dia: 1.025" | Actual velocity: 3.9 ft/s
Pipe Size Comparison
| Nominal | Inner Dia | Velocity | Status |
|---|---|---|---|
| 0.5" | 0.545" | 13.8 ft/s | Too Small |
| 0.75" | 0.785" | 6.6 ft/s | Too Small |
| 1" | 1.025" | 3.9 ft/s | OK |
| 1.25" | 1.265" | 2.6 ft/s | OK |
| 1.5" | 1.505" | 1.8 ft/s | OK |
| 2" | 1.985" | 1.0 ft/s | OK |
| 2.5" | 2.465" | 0.7 ft/s | OK |
| 3" | 2.945" | 0.5 ft/s | OK |
Pipe Sizing Formula
Pipe area = Flow Rate / Velocity. Recommended velocity: 4-8 ft/s for water supply, 2-4 ft/s for drainage. Size up to the nearest standard pipe size.
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Disclaimer: This tool is provided as-is for informational and educational purposes only.