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Darcy–Weisbach Pipe Friction Loss Calculator — result sheet
Estimate pipe friction head loss and pressure loss from the Darcy friction factor, length, diameter, velocity, and fluid density.
Inputs used
Results
Visual chart
Breakdown
Calculation steps
Returned data table
Formula and methodology
Formula: hL = f(L/D)·v²/(2g); pressure loss is Δp = ρghL.
Darcy–Weisbach head loss represents the energy lost to wall friction in a pipe. The friction factor is an input because it depends on the flow regime, roughness, and Reynolds number; this calculator focuses on the loss calculation once a defensible factor is available.
This result follows the calculator's declared inputs, precision, validation boundaries, and model limits.
Input contract
- Darcy friction factor — unitless; minimum 1.0E-6; maximum 1000
- Pipe length — m; minimum 1.0E-6; maximum 1000000000
- Inside diameter — m; minimum 1.0E-6; maximum 1000000
- Mean flow velocity — m/s; minimum 1.0E-6; maximum 100000
- Fluid density — kg/m³; minimum 1.0E-6; maximum 1000000
- Gravitational acceleration — m/s²; minimum 1.0E-6; maximum 1000
Worked example
| Input | Value |
|---|---|
| Darcy friction factor | 0.02 |
| Pipe length | 100 |
| Inside diameter | 0.1 |
| Mean flow velocity | 2 |
| Fluid density | 998 |
| Gravitational acceleration | 9.80665 |
The estimated head loss is about 4.08 m and the pressure loss is about 39.9 kPa.
Assumptions and limits
- Length, diameter, velocity, density, and gravity use a consistent unit system, here SI units.
- The entered factor is the Darcy friction factor rather than the Fanning friction factor.
- The model covers straight-pipe wall friction and omits fittings, valves, elevation change, pump curves, and entrance or exit losses.
Calculator note
Source and methodology
Use the official WorldCalculate methodology policy for the source, formula, precision, and boundary standards behind this calculator.
Planning estimate, not financial, medical, legal, or professional advice. © WorldCalculate — reuse with attribution. Built and curated by Hassan ALRowaie.
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