Engineering calculator reviewed for preliminary design use · Last updated: March 2026
Calculate local pressure losses for pipe fittings using the K-factor method. Covers elbows (45°/90°), tees, gate valves, globe valves, check valves, and reducers. Sum all fitting losses across the entire piping system.
Pipe Fittings Pressure Loss Calculator (K-Factor Method)
Local (minor) losses in piping systems occur at fittings, valves, bends, and flow area changes. The K-factor method calculates these losses using ΔP = K × ρv²/2, where K is a dimensionless resistance coefficient.
The K-factor method calculates fitting pressure loss as ΔP = K × (ρv²/2), where K is a dimensionless resistance coefficient specific to each fitting type and size. It is the most common method for preliminary piping design.
Where do K values come from?
K values are published in engineering references like Crane TP-410 and Miller's Internal Flow Systems. Values depend on fitting type, size, and Reynolds number. Use manufacturer-specific data when available for detailed design.
These results are preliminary estimates for screening-level design use. They do not replace detailed engineering, code compliance verification, or vendor-certified calculations.