PEX Tubing Sizing Calculator
Size PEX tubing for water supply per UPC/IPC requirements
Fixture Units
System Parameters
UPC/IPC limits velocity to 8 ft/s for water supply
Recommended PEX Size
Minimum PEX Size
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Actual Velocity
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Total WSFU
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Demand Flow (GPM)
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Pressure Loss
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Remaining Pressure
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Note: PEX has smaller inside diameter than copper. Size up if replacing copper pipe.
PEX Size Reference
| Nominal Size | OD (in) | ID (in) | Max GPM @ 8 ft/s |
|---|---|---|---|
| 3/8" | 0.500 | 0.350 | 2.4 |
| 1/2" | 0.625 | 0.475 | 4.4 |
| 3/4" | 0.875 | 0.681 | 9.1 |
| 1" | 1.125 | 0.863 | 14.6 |
| 1-1/4" | 1.375 | 1.063 | 22.1 |
| 1-1/2" | 1.625 | 1.263 | 31.3 |
| 2" | 2.125 | 1.653 | 53.5 |
PEX Installation Guidelines
Temperature Rating
180F max continuous
200F peak
100 PSI @ 180F
Bend Radius
6x OD minimum
Use support at bends
Avoid kinks
Support Spacing
32" horizontal
48" vertical
Per manufacturer
UV Protection
No direct sunlight
30-60 day max exposure
Use sleeve outdoors