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

Inlet Area Square Meters (m²)

Required number input.

Throat Area Square Meters (m²)

Required number input.

Pressure Difference Pascals (Pa)

Required number input.

Density Kg Per M3 (kg/m³)

Required number input.

Discharge Coefficient

Required number input.

Incompressible Venturi flow from inlet and throat area, pressure difference and discharge coefficient; requires throat smaller than inlet. 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]

Flow Cubic Meters Per Second (m³/s)

The resulting flow cubic meters per second 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.

• Manning Flow Rate

  Open-channel discharge from Manning n, flow area, hydraulic radius and energy slope in SI units.

• Orifice Flow Rate

  Idealized incompressible orifice discharge Q=Cd A√(2Δp/ρ); Cd must be supplied for the actual geometry.

• Convective Heat Transfer

  Newton-law convection heat-transfer rate hAΔT with a supplied convection coefficient at the stated flow condition.