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Minor Loss Calculator — K Factor, Head Loss & Pressure Drop
Calculate fitting and valve minor head loss and pressure drop from loss coefficient K, velocity and fluid density.
Last updated: September 17, 2026
Fitting & valve schedule
Typical planning K values; use manufacturer/project data when available.
Schedule K: 0
Results
Formula, example and assumptions
hL=Kv²/(2g); ΔP=ρKv²/2.
K=2.0 at 3 m/s gives hL≈0.917 m and about 8.98 kPa in water at 998 kg/m³.
- K must represent the actual fitting/valve and reference velocity.
- Density is treated as constant.
Frequently asked questions
What does the Minor Loss Calculator calculate?
Calculate fitting and valve minor head loss and pressure drop from loss coefficient K, velocity and fluid density.
Which units should I use?
The input labels show the required SI units. Keep properties and geometry consistent before using the result in another engineering calculation.
Can I use this result for design?
Use it for transparent engineering estimates and checks. Validate property data, geometry, correlations and applicable codes for safety-critical design.