Calculate volumetric flow rate based on pipe diameter and velocity.
Imperial (Inches / ft/s)
Metric (mm / m/s)
Calculation Results:
Gallons Per Minute (GPM):
–
Liters Per Minute (L/min):
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Cubic Meters Per Hour (m³/h):
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Cubic Feet Per Second (CFS):
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How to Use the Online Pump Flow Rate Calculator
Calculating the flow rate of a pump is essential for designing irrigation systems, plumbing networks, and industrial processes. This online tool allows you to determine how much fluid is moving through a pipe based on the pipe's interior dimensions and the speed of the fluid.
The Pump Flow Rate Formula
The fundamental equation for volumetric flow rate is Q = A × v, where:
Q: Volumetric flow rate
A: Cross-sectional area of the pipe (π × r²)
v: Velocity of the fluid
Common Fluid Velocity Standards
When designing a system, certain fluid velocities are recommended to prevent pipe erosion or sediment buildup:
Application
Recommended Velocity (ft/s)
Recommended Velocity (m/s)
Suction Lines
2 – 4 ft/s
0.6 – 1.2 m/s
Discharge Lines
5 – 10 ft/s
1.5 – 3.0 m/s
General Water Service
4 – 7 ft/s
1.2 – 2.1 m/s
Practical Calculation Example
Imagine you have a pipe with an internal diameter of 3 inches and a fluid velocity of 6 feet per second:
Calculate Area: (π × 1.5²) = 7.068 square inches.
Convert Area to square feet: 7.068 / 144 = 0.0491 sq ft.