Free Pressure Drop Calculator
Calculate total pressure drop along a pipe from friction losses using fluid properties.
m
mm
m/s
kg/m^3
Pressure Drop
39.1 kPa
Equivalent Head Loss3.98 m
Pressure Drop vs Friction Factor (f)
Pressure Drop in Pipes
Pressure drop is the energy lost to friction as fluid flows through a pipe.
Formula
delta_P = f (L/D) (0.5 rho V^2)
This is the Darcy-Weisbach equation expressed in pressure units (Pa) rather than head (m). The two forms are related by delta_P = rho g h_f.
Example Calculation
Water at 2.5 m/s through 80 mm pipe, 50 m long, f = 0.02.
- 01D = 0.08 m, L/D = 50/0.08 = 625
- 02Dynamic pressure = 0.5 x 1000 x 2.5^2 = 3125 Pa
- 03delta_P = 0.02 x 625 x 3125 = 39,063 Pa = 39.1 kPa
- 04Head loss = 39,063 / (1000 x 9.81) = 3.98 m
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