All calculators
Fluid engineering, Advanced, fully interactive
Pipe Pressure Drop Calculator
Darcy-Weisbach friction pressure drop in a pipe
Formula: pressure_drop = friction_factor × (pipe_length÷diameter) × (density × velocity² ÷ 2)
Calculate the friction pressure drop along a straight section of pipe using the Darcy-Weisbach equation. Pair with minor-loss factors for fittings to size pumps and verify a network won't starve at the far end. Choose the friction factor from the Moody diagram once you know Reynolds number.
Inputs
Results
Pressure Drop
39,920 Pa
Recommended next actions
- →Add minor losses for fittings
- →Check Reynolds number before choosing friction factor
Turn this result into an action plan
Send the calculation to your inbox or book a review if the numbers point to cost, compliance, or uptime risk.
Formula
pressure_drop = friction_factor × (pipe_length÷diameter) × (density × velocity² ÷ 2)Worked example
Inputs
friction_factor0.02
pipe_length100
diameter0.1
density998
velocity2
Outputs
pressure_drop39920
For estimation and decision support. Verify safety-critical results with OEM data, standards, or qualified engineering review.