Unit converter
Airflow converter
Convert airflow between CFM, m3/h, and L/s for duct design, ventilation rates, and data-center cooling.
Quick answer
1 CFM = 1.69901 m3/h. 1 CFM = 0.471947 L/s.
Common airflow conversions
| Unit | m3/h | L/s |
|---|---|---|
| 1 CFM | 1.69901 | 0.471947 |
| 1 m3/h | 1 | 0.277778 |
| 1 L/s | 3.6 | 1 |
| 1 m3/s | 3600 | 1000 |
| 1 CFH | 0.0283168 | 0.00786579 |
About this converter
Convert airflow between CFM, m3/h, and L/s for duct design, ventilation rates, and data-center cooling. 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 and Datacenter work.
Calculators that use airflow
ACH to CFM calculatorFind the airflow for a target air change rate: CFM = room volume x ACH / 60, from floor area and ceiling height.Ventilation rate calculatorFind the breathing-zone outdoor air a space needs: Vbz = Rp x Pz + Ra x Az.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.
Airflow conversion FAQ
How do you convert CFM to m3/h?
Multiply by 1.69901: 1 CFM = 1.69901 m3/h. To convert back, 1 m3/h = 0.588578 CFM.
How do you convert CFM to L/s?
Multiply by 0.471947: 1 CFM = 0.471947 L/s. To convert back, 1 L/s = 2.11888 CFM.