Pipe Velocity Calculator
Calculate average water velocity inside a pipe using its flow rate and inside diameter. View results in feet per second and meters per second.
Enter the flow rate and the pipe's actual inside diameter. Choose the units that match your measurements; results update automatically.
Water Velocity
Velocity is calculated from volumetric flow rate divided by the pipe's internal cross-sectional area.
How to Use the Calculator
- Enter the flow rate and select its unit.
- Enter the pipe's actual inside diameter and select its unit. Do not substitute nominal pipe size or outside diameter.
- Review the automatically calculated average water velocity in meters per second and feet per second.
- Use Reset Calculator to restore the default example values.
Assumptions and Limitations
This calculator assumes a circular pipe that is completely filled and uses the pipe's actual inside diameter. It calculates average velocity from volumetric flow rate and cross-sectional area. It does not calculate pressure loss, account for fittings or changes in pipe diameter, or predict the actual performance of a plumbing system. Results are rounded for readability.
