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Velocity from GPM Calculator

Formula

The formula to calculate the velocity from GPM is:

$V = \frac{\text{GPM}}{7.481 \times A \times 60}$

Where:

V is the velocity (ft/s)
GPM is the gallons per minute
A is the cross-sectional area of flow (ft²)

What is Velocity from GPM?

To calculate the velocity from gallons per minute, divide the GPM by 7.481, divide again by the cross-sectional area of flow, then finally, divide by 60. This will give you the velocity in feet per second.

Example Calculation

Example:

Gallons Per Minute: 100 GPM
Cross-Sectional Area: 2 ft²

Calculation:

$V = \frac{100}{7.481 \times 2 \times 60} = 0.11 \text{ ft/s}$