Flow & Velocity Calculator
Calculate flow rate, velocity, or required pipe size.
Flow Formula
V = Q / A
V = velocity (fps), Q = flow (cfs), A = area (sq ft)
GPM × 0.002228 = cfs
Velocity Limits
- 5 fps: Quiet operation, hot water lines
- 8 fps: Standard residential/commercial
- 10 fps: Maximum recommended
- >10 fps: Water hammer, noise, erosion risk