Unit converter
Air & fluid velocity converter
Convert velocity between feet per minute, meters per second, and mph for duct and pipe sizing.
Quick answer
1 fpm = 0.00508 m/s. 1 mph = 1.60934 km/h.
Common air & fluid velocity conversions
| Unit | m/s | fpm |
|---|---|---|
| 1 fpm | 0.00508 | 1 |
| 1 m/s | 1 | 196.85 |
| 1 mph | 0.44704 | 88 |
| 1 km/h | 0.277778 | 54.6807 |
About this converter
Convert velocity between feet per minute, meters per second, and mph for duct and pipe sizing. It runs in your browser and works offline, so you can convert on the truck or in the field with no signal.
Common on HVAC work.
Calculators that use air & fluid velocity
ACH to CFM calculatorFind the airflow for a target air change rate: CFM = room volume x ACH / 60, from floor area and ceiling height.Duct equivalent diameterConvert a rectangular duct to its equal-friction round diameter: De = 1.30 x (a x b)^0.625 / (a + b)^0.250.Duct airflow calculatorSolve duct airflow and velocity from the duct size using continuity (Q = V x A): enter a round or rectangular duct and either the CFM or the velocity, and get the other.Pipe velocity calculatorFind water velocity in a pipe from the flow rate: V = 0.4085 x GPM / diameter squared, in feet per second.
Air & fluid velocity conversion FAQ
How do you convert fpm to m/s?
Multiply by 0.00508: 1 fpm = 0.00508 m/s. To convert back, 1 m/s = 196.85 fpm.
How do you convert mph to km/h?
Multiply by 1.60934: 1 mph = 1.60934 km/h. To convert back, 1 km/h = 0.621371 mph.