Use this engineering calculation for a transparent preliminary estimate or independent arithmetic check when geometry, materials, loads, operating conditions, and units are defined consistently.

Flow Area Square Meters (m²)

Required number input.

Wetted Perimeter Meters (m)

Required number input.

Hydraulic diameter 4A/P for a flowing cross section with wetted perimeter P. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

Diameter Meters (m)

The resulting diameter meters returned as a number.

• Hydraulic equations require consistent datum, fluid properties, geometry, roughness, flow regime, and loss coefficients. Cavitation, air entrainment, unsteady flow, fittings, sediment, free-surface effects, and pump behavior may require a network or numerical model.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Check assumptions against drawings, measurements, current material data, and the applicable design code. Apply required load combinations and safety factors, then obtain qualified review and testing for consequential designs.

• Wire Cross Section

  Circular solid conductor cross-sectional area from measured diameter, excluding insulation.

• Duct Pressure Loss

  Straight-duct Darcy friction pressure loss f(L/Dh)(ρv²/2) with supplied friction factor and hydraulic diameter; excludes fittings.

• Extrusion Ratio 2

  Extrusion area ratio of starting billet cross section to final extrudate cross section.