Water Velocity Calculator

Calculate water velocity in pipe from flow rate and pipe diameter (V = Q/A)

Volumetric flow rate. Typical residential: 2-10 GPM.
Use actual ID, not nominal. Common: 1/2" ID=0.622", 3/4" ID=0.824", 1" ID=1.049".

Results

Velocity-ft/s
Velocity-m/s
Cross-Section Area-in²
Flow Status-
References: ASHRAE Handbook - Fundamentals. Recommended max velocity: 4-8 ft/s to minimize noise and erosion.