Hydronic Pipe Sizer

Darcy-Weisbach pipe sizing for hydronic systems
Inputs

Sizing Method
Results
Recommended Size
in. nominal
Velocity
Head / 100 ft
Total Head
Pressure Drop
Adjust Size
in.
⚠ Velocity exceeds 8 ft/s — erosion risk. Consider upsizing.
⚠ Laminar flow (Re < 2300) — head loss may be underestimated.
Fluid Properties at Temperature
Density
Viscosity
Reynolds No.

All Sizes —
Nom. (in.) ID (in.) Vel. (ft/s) HL / 100ft OK?