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Volumetric Flow Rate & Pipe Diameter to Flow Speed Calculator

Flow Velocity Factors
Volume Flow (Q) [?]
per (/)
Diameter (ø) [?]
Calculate Speed of Flow
Flow Velocity (v) [?]
per (/)
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Contents

  • Related Tools
  • User Guide
    • Formula
      • Symbols
    • Volumetric Flow Rate Measured
    • Diameter
    • Flow Velocity Calculation

Related Tools

Find another flow measurement calculator by clicking on the required answer which coincides with the input parameters you already know.

vol flow mass flow flow speed vol mass time
area flow speed vol flow
dia flow speed vol flow
w x h flow speed vol flow
time vol mass vol flow mass flow
vol time density vol flow
mass time density mass flow
density mass flow vol flow mass vol
flow speed area, dia
  • Calculate volumetric flow rate from flow velocity and pipe diameter
  • Calculate duct diameter from flow velocity and volume flow rate
  • Calculate mass flow rate from volumetric flow rate and density
  • Convert volumetric flow rates to other units
  • Convert diameter into to other units
  • Convert flow speed to other units

User Guide

This tool will calculate the flow velocity in any units from the specified volumetric flow rate of a substance flowing through a round duct or pipe of a chosen diameter. For each new calculation a unique conversion scale will be generated for the range of volumetric flow rates and flow speeds for the diameter specified.

Formula

The flow velocity formula used by this calculator is:

v = Q / (π · (ø / 2)²)

Derived from:

v = Q / A

A = π · r²

r = ø / 2

Symbols

  • Q = Volume flow rate
  • v = Flow velocity
  • A = Cross-sectional area
  • r = Radius
  • ø = Diameter

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

Volumetric Flow Rate Measured

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

Diameter

Enter the inside diameter of the circular pipe or duct.

Flow Velocity Calculation

This is the speed at which the substance is moving.

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Tool Sections

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  • Diameter & Radius
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  • Speed & Acceleration
  • Temperature & Heat
  • Time & Frequency
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  • Volumetric

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