Flow Rate Calculator

Calculate the volumetric flow rate of a fluid through a pipe or channel.

Calculator

Enter Your Values

Enter the cross-sectional area in square meters (m²)

Enter the velocity in meters per second (m/s)

Table of Contents

1 Flow Rate Formula
2 How to Calculate
3 Units and Conversions
4 Practical Examples
Concept

Flow Rate Formula

The volumetric flow rate is the volume of fluid that passes through a given surface per unit time.

Formula:
Q = A × v

Where:

  • Q = Volumetric flow rate (m³/s)
  • A = Cross-sectional area (m²)
  • v = Velocity (m/s)
Steps

How to Calculate

To calculate the flow rate, follow these steps:

  1. 1
    Measure or calculate the cross-sectional area of the pipe or channel
  2. 2
    Measure the velocity of the fluid
  3. 3
    Multiply the area by the velocity to get the flow rate
Advanced

Units and Conversions

Common units for flow rate include:

  • m³/s (cubic meters per second)
  • L/s (liters per second)
  • m³/h (cubic meters per hour)
  • L/min (liters per minute)
Common Conversions:
  • 1 m³/s = 1000 L/s
  • 1 m³/s = 3600 m³/h
  • 1 L/s = 60 L/min
Examples

Practical Examples

Example 1 Water Pipe

Calculate the flow rate of water through a pipe with a diameter of 10 cm and a velocity of 2 m/s.

A = π × (0.1/2)² = 0.00785 m²

Q = A × v = 0.00785 × 2 = 0.0157 m³/s

Example 2 River Channel

A river channel has a cross-sectional area of 50 m² and a flow velocity of 0.5 m/s. Calculate the flow rate.

Q = A × v = 50 × 0.5 = 25 m³/s

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