About Pipe Water Flow Rate Calculator
Calculate water flow rate in GPM and LPM through a pipe based on diameter and water velocity.. Designed for accurate, instantaneous calculations with zero wait time.
Formula
Flow Rate (GPM) = 2.448 × (Inside Diameter in)² × Velocity (ft/s)
Example Calculation
A 1-inch pipe with water moving at 5 ft/s delivers ~12.24 Gallons Per Minute (GPM).
How to Use
- Enter your values into the form fields above.
- The calculation updates immediately in real time.
- Inspect the main summary and secondary breakdowns below.