Frictionless Calc

K Factor ↔ Equivalent Length Calculator

Convert between a minor-loss K factor and an equivalent length of straight pipe.

Inputs

Results

Equivalent length
—
Equivalent length
—
K
—
L/D
—

Equation and limitation

K = f(Lₑ/D)    ⇄    Lₑ = KD/f

Equivalent length is not a fixed physical property of a fitting unless the friction factor is also fixed. Because f changes with Reynolds number and roughness, the equivalent length corresponding to a given K can change with operating conditions.