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Darcy Friction Factor from Head Loss Calculator — result sheet
Rearrange the Darcy–Weisbach relation to estimate a dimensionless friction factor from measured head loss and pipe conditions.
Inputs used
Results
Visual chart
Breakdown
Calculation steps
Returned data table
Formula and methodology
Formula: Friction factor=2×gravity×head loss×diameter/(length×velocity²).
This rearrangement makes the dimensionless Darcy friction factor visible when head loss, diameter, length, velocity, and gravity are known.
This result follows the calculator's declared inputs, precision, validation boundaries, and model limits.
Input contract
- Head loss — m; minimum 0; maximum 1000000000000
- Pipe diameter — m; minimum 1.0E-6; maximum 1000000000
- Pipe length — m; minimum 1.0E-6; maximum 1000000000000
- Mean velocity — m/s; minimum 1.0E-6; maximum 1000000000
- Gravitational acceleration — m/s²; minimum 1.0E-6; maximum 10000
Worked example
| Input | Value |
|---|---|
| Head loss | 1 |
| Pipe diameter | 0.1 |
| Pipe length | 10 |
| Mean velocity | 2 |
| Gravitational acceleration | 9.80665 |
Darcy friction factor ≈0.0490.
Assumptions and limits
- The measured head loss is represented by the straight-pipe Darcy–Weisbach term.
- Velocity is the cross-section mean velocity and diameter is hydraulic diameter for the model.
- Fittings, entrance losses, roughness correlations, and uncertainty are not separated from the entered head loss.
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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