CFM to m³/h and m³/h to CFM
Multiply CFM by 1.69901079552 to get m³/h. Divide m³/h by the same factor to get CFM. The table uses rounded display values at unchanged reference conditions.
| CFM | m³/h |
|---|---|
| 1 | 1.69901 |
| 50 | 84.9505 |
| 100 | 169.901 |
| 250 | 424.753 |
| 400 | 679.604 |
Reverse example: 300 m³/h ÷ 1.69901079552 = approximately 176.573 CFM. This is a unit conversion, not a change from actual line flow to free air delivery.
L/min to CFM and CFM to L/min
Divide L/min by 28.316846592 to get CFM. Multiply CFM by the same factor to get L/min.
| L/min | CFM |
|---|---|
| 100 | 3.53147 |
| 500 | 17.6573 |
| 1000 | 35.3147 |
| 5000 | 176.573 |
| 10000 | 353.147 |
Worked example: 500 L/min ÷ 28.316846592 = approximately 17.6573 CFM. In reverse, 20 CFM × 28.316846592 = 566.33693184 L/min. Keep the pressure and temperature basis with either result.
Start with like-for-like figures
A flow figure needs more than a unit. Free air delivery (FAD), standard flow and actual compressed-line flow can describe different reference conditions. Check the manufacturer’s pressure and temperature basis before comparing two ratings.
CFM means cubic feet per minute. L/min means litres per minute; m³/min and m³/h mean cubic metres per minute and per hour. Changing the unit does not turn line flow into FAD, or standard flow into actual flow.
Worked example: 100 CFM
The international foot is exactly 0.3048 metres. One cubic foot is therefore 0.028316846592 m³, so 1 CFM = 28.316846592 L/min. A figure of 100 CFM becomes 2,831.6846592 L/min, 2.8316846592 m³/min or 169.901079552 m³/h before display rounding.
Use the converted figure
Record the original reference conditions alongside your result. To combine equipment requirements, use the air demand planner. Pressure is a separate specification: gauge and absolute pressure are not interchangeable.