MAXScanner engineering calculator
Pipe Equivalent Length Calculator — K-Factor to Added Pipe Length
Convert fitting loss coefficient to equivalent straight-pipe length and combine it with the installed straight run for pressure-loss workflows.
Last updated: September 17, 2026
Results
Formula, example and assumptions
Leq=K·D/f; Ltotal=Lstraight+ΣLeq.
With K=8, D=0.1 m and Darcy f=0.02, the fitting represents 40 m of equivalent straight pipe.
- K and friction factor must correspond to the same fitting, pipe and flow convention.
- The entered f is the Darcy friction factor; equivalent-length methods are approximations when f varies.
Frequently asked questions
What does this Pipe Equivalent Length Calculator solve?
Convert fitting loss coefficient to equivalent straight-pipe length and combine it with the installed straight run for pressure-loss workflows.
Which units should I use?
Use the units printed beside each input. Dimensionless ratios need no conversion; pressure inputs used in gas equations are absolute unless the field explicitly says differential.
Is this suitable for final engineering design?
Use it for transparent first-pass calculations and cross-checks. Final design should verify gas or fluid properties, geometry, loss data, equipment curves and the applicable engineering standard.