Friction Loss Calculator

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Calculate pressure loss and head loss due to friction in pipes and ducts.

Flow Parameters

Calculation Method

Pipe Length (L) (m)

Pipe Diameter (D) (m)

Flow Velocity (v) (m/s)

Pipe Material

Loss Analysis

Enter pipe parameters to calculate friction loss

About this calculator

Quick Reference

h_fFriction head loss (m)

ΔPPressure drop (Pa)

fDarcy friction factor

LPipe length (m)

DPipe diameter (m)

vFlow velocity (m/s)

g9.81 m/s² (gravity)

ReReynolds number

Overview

Friction loss is the energy loss due to friction between a fluid and the walls of a pipe or duct. It is calculated using the Darcy-Weisbach equation and affects pump sizing, energy consumption, and system efficiency.

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Pro Tips

Head loss increases with pipe length and decreases with pipe diameter
Higher velocity increases friction losses significantly (v² term)
Smooth pipes have lower friction losses than rough pipes
Friction losses are major factors in HVAC and plumbing system design
The Darcy-Weisbach equation is the most accurate for friction loss calculation

Fun Facts

"In a typical home plumbing system, friction losses can be 1-5 meters of head"
"Long-distance pipelines (1000+ km) require booster pumps every 50-100 km"
"Friction losses in blood vessels contribute to heart workload"
"The Empire State Building plumbing system overcomes 15+ meters of friction head"
"Modern pipes are designed with smooth interiors to minimize friction losses"

Formula: h_f = f × (L/D) × (v²/(2g))