Major Loss Online Calculator - the Darcy-Weisbach Friction Loss Equation

Calculate major friction losses in pipes using the Darcy-Weisbach equation. This calculator determines pressure drop due to friction in fluid flow through pipes based on friction factor, pipe length, diameter, and fluid velocity.

Parameter	Symbol	Value	Unit	Description
Friction Factor	f			Darcy friction factor (dimensionless)
Pipe Length	L		m	Length of the pipe section
Pipe Diameter	D		m	Internal diameter of the pipe
Fluid Velocity	v		m/s	Average flow velocity in the pipe
Gravitational Acceleration	g	9.81	m/s²	Standard gravity constant
Major Loss (Head Loss)	hf		m	Friction loss head (Darcy-Weisbach)
Pressure Drop	ΔP		Pa	Pressure drop due to friction

Darcy-Weisbach Equation

The major loss (friction loss) in pipes is calculated using:

hf = f × (L/D) × (v²/2g)

Where:

hf = friction loss (head loss) in meters
f = Darcy friction factor (dimensionless)
L = length of pipe (m)
D = pipe diameter (m)
v = flow velocity (m/s)
g = gravitational acceleration (9.81 m/s²)

The pressure drop equivalent is:

ΔP = ρ × g × hf

Where:

ρ = fluid density (kg/m³)

Major Loss Online Calculator - the Darcy-Weisbach Friction Loss Equation | MEPKit Engineering Tools | MEPKit