Pipe Friction Head Loss & PSI DropEngineering

Pipe Friction Head Loss & Hydraulic Pressure Drop Calculator (Hazen-Williams)

Calculate water flow friction head loss (meters/feet) and line pressure drop (PSI / Bar) across plumbing, irrigation, and HVAC piping using the empirical Hazen-Williams equation.

Calculator Inputs

Live Real-Time
L/min
Quick select:
mm
Quick select:
m
Quick select:
Calculated ResultPipe Friction Head Loss & PSI Drop

Total Friction Pressure Drop (Bar)

0bar

Hydraulic Head Loss (Meters of Water)

0 m

Fluid Flow Velocity in Pipe

0 m/s

Detailed Calculation Breakdown

Pressure Drop in PSI
0 PSI
Flow Velocity
0 m/s
Total Line Drop
0 bar

Calculation Methodology

Hazen-Williams Head Loss (m) = 10.67 * (Q^1.852 / (C^1.852 * D^4.87)) * Pipe Length (m). Pressure Drop (PSI) = Head Loss (ft) * 0.4335.

Important Legal & Educational Disclaimer

Accurate friction head loss calculation prevents pump oversizing or undersizing in domestic and agricultural piping systems.

This calculator is designed for educational and informational purposes only based on public statutory frameworks. The outputs do not constitute binding financial, tax, or legal advice. We assume no liability for decisions made based on these estimations. Always verify with the relevant official authorities or a certified professional advisor.

Frequently Asked Questions

Friction loss is inversely proportional to the diameter to the 4.87th power. Doubling the internal diameter reduces friction losses by more than 95% at the same flow rate.
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