When to use this calculator
Estimate fitting or local head loss from a supplied loss coefficient. Each coefficient must use a compatible reference velocity.
Explore the fluids & flow calculators for other questions in this topic. For a related calculation, use the Pipe Flow Velocity Calculator: Convert pipe volume flow into average velocity.
PUTTING IT INTO PRACTICE
Minor Loss Head: a worked example
The values below are an illustrative example, not a recommendation. Replace them with measurements or assumptions that match your question.
| Input | Example value |
|---|---|
| Total loss coefficient K | 2 |
| Mean reference speed (m/s) | 3 |
| Gravity (m/s²) | 10 |
| Result | 0.9 m of fluid |
- Check the input labels and enter the example values above.
- Apply the relationship: Head loss = K × speed²/(2g).
- The result is 0.9 m of fluid, rounded for display.
How to interpret your result
Each coefficient must use a compatible reference velocity.
Use the fluid properties at the relevant conditions. Gauge pressure is measured relative to a reference and differs from absolute pressure. Average flow velocity and characteristic length must match the geometry being modelled.
Frequently asked questions
Should hydrostatic pressure be added to atmospheric pressure?
Add the surface absolute pressure when an absolute result is needed. The basic liquid-column calculation alone gives the pressure increase with depth.
When is the minor loss head calculator useful?
Estimate fitting or local head loss from a supplied loss coefficient. Each coefficient must use a compatible reference velocity.
How do I use the minor loss head calculator?
Enter total loss coefficient k, mean reference speed (m/s), gravity (m/s²). The result updates automatically. Use the units shown beside each input; the example values illustrate the method.
Which formula does this calculator use?
Head loss = K × speed²/(2g).
What should I check before using the result?
Each coefficient must use a compatible reference velocity.
How are results rounded?
Scalar numbers display up to six decimal places, with scientific notation for very large or small values. Text, fraction, date and schedule outputs use the format described on the tool. Intermediate calculations use JavaScript floating-point arithmetic. Keep sensible precision for your measurements.
Further reading
For background on this topic, see OpenStax: fluids, density and pressure ↗. This is a topic reference, not an external review or endorsement of this tool.
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