Pipe Friction & Pressure Drop Calculator
A Darcy-Weisbach pressure-drop and head-loss calculator for a single pipe run — model friction loss, fitting/valve losses, and elevation change across common pipe materials, with temperature-dependent water properties and full metric/imperial support.
Standard Compliance
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Request ConsultationExport Capabilities
- Professional HTML pressure-drop report
- Full friction and minor-loss breakdown
- Metric / Imperial unit conversion
- 11 pipe materials and 12 fitting/valve types
Pipe Friction & Pressure Drop Calculator
Darcy-Weisbach major loss with Colebrook-White friction factor, plus K-value fitting losses, for a single uniform pipe run.
Positive = outlet higher than inlet (uphill).
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Engineering Methodology
Major (frictional) head loss follows the Darcy-Weisbach equation, with the Darcy friction factor computed via the Swamee-Jain explicit approximation of the Colebrook-White equation for turbulent flow, or f = 64/Re for laminar flow (Re < 2300).
Fitting and valve losses use the standard K-value method (h = K·V²/2g), with published reference K-values per fitting type. Water density and viscosity are temperature-interpolated from standard reference tables.
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