GPM Flow Rate Calculator - Gallons Per Minute Tool

Calculate pipe flow rate in GPM from diameter and velocity. Accurate gallons per minute calculations for sizing pumps, designing plumbing systems, and troubleshooting flow issues.

Gallons Per Minute (GPM) Calculator

Calculate the flow rate in gallons per minute based on pipe diameter and flow velocity.

The flow rate is calculated using the formula:

GPM = 2.448 × (diameter)² × velocity

inches
ft/sec
📚

Documentation

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