Built for practical decisions
This tool provides a preliminary Hazen-Williams estimate for water in a straight circular pipe. Fittings, valves, elevation and project-specific hydraulic criteria must be added separately.
Important assumptions
Use the result as a planning estimate. Confirm material data, machine settings, drawing tolerances and applicable standards before production or structural work.
Quick answers about this pipe flow and pressure drop calculator
What does the pipe flow and pressure drop calculator help me decide?
Estimate water velocity, straight-pipe friction head loss and approximate pressure drop.
Can I use the result directly for production?
Use it as a starting estimate. Verify the drawing, material grade, machine capability, tooling data and applicable standard before cutting, forming, welding or ordering material.