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Flow Velocity & Rectangular Duct Width x Height to Volumetric Flow Rate Calculator

Volume Flow Rate Factors
Flow Velocity (v) [?]
per (/)
Width [?]
Height [?]
Calculate Volumetric Flow Rate
Volume Flow (Q) [?]
per (/)
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  • Calculate flow speed from volumetric flow rate and the width x height of the duct
  • Calculate mass flow rate from volumetric flow rate and density
  • Convert volumetric flow rates to other units
  • Convert width and height into to other units
  • Convert flow speed to other units

Contents

Toggle
  • User Guide
    • Formula
      • Symbols
    • Flow Velocity Measured
    • Width
    • Height
    • Volumetric Flow Rate Calculation

User Guide

This tool will calculate the volumetric flow rate in any units from the specified velocity of a substance flowing through a rectangular duct of a defined width and height. For each new calculation a unique conversion scale will be generated for the range of flow speeds and volumetric flow rates for the length and width specified.

Formula

The volumetric flow rate formula used by this calculator is:

Q = v · w · h

Derived from:

Q = v · A

A = w · h

Symbols

  • Q = Volume flow rate
  • v = Flow velocity
  • A = Cross-sectional area
  • w = Width
  • h = Height

n.b. This formula assumes uniform flow conditions within the entire cross-sectional area of duct, without any friction losses near to surfaces.

Flow Velocity Measured

Enter the speed at which the substance is moving.

Width

Enter the internal width of the section of duct being used to measure flow.

Height

Enter the internal height of the section of duct being used to measure flow.

Volumetric Flow Rate Calculation

This is the volumetric amount of substance that will flow pass in a unit of time.

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