PEX Pipe Size Worksheet
PEX sizing by flow starts from actual inside diameter, not just nominal tubing size. Use flow and velocity to screen the required ID, then verify pressure drop.
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Velocity sizing
A = Q / v
Diameter from area
D = sqrt(4 * A / pi)
PEX caution
The result is actual ID. PEX nominal sizes, fittings and manifolds can have smaller effective openings, so re-check the selected product path.
Related pages
- Pipe pressure drop calculator - Darcy-Weisbach loss, head and velocity from flow and pipe ID.
- Pipe size by flow velocity - pick a first-pass pipe ID from flow and target velocity.
- Pump flow and HP calculator - pump displacement, pressure, flow, kW and horsepower.
- Pump NPSH calculator - available suction head and NPSH margin.