Pipe Velocity Calculator
Flow velocity and pipe sizing.
Enter your values
Results update instantly as you type — no submit needed.
Results
- Velocity
- 1.59 m/s
- Cross-sectional area
- 50.27 cm²
- Within limit?
- Yes
- Min diameter for limit
- 64 mm
Quick answer
Pipe velocity is flow rate divided by internal cross-sectional area.
v = Q ÷ A
How to use the Pipe Velocity Calculator
- 1Enter the design flow rate.
- 2Enter internal pipe diameter.
- 3Compare velocity against the recommended maximum.
Frequently asked questions
What velocity is too high?
Above 2.5 m/s in water pipes causes noise and erosion.
Why does velocity matter?
Friction losses rise with the square of velocity.