Flow Rate Converter
Convert volumetric flow units with the factor behind each answer. These are volume flows, not mass flows.
1 m³/h = 0.5885777787 CFM
Common conversions
- 1 m³/h = 0.5885777787 CFM
- 1 CFM = 1.699010796 m³/h
- 1 L/s = 3.6 m³/h
- 1 L/min = 0.2641720524 GPM
- 1 GPM = 3.785411784 L/min
- 1 m³/min = 35.31466672 CFM
Fans and ventilation
Fan data is quoted in CFM in US practice and in m³/h or L/s in IEC practice. Generator and switchgear room ventilation is sized from the heat to remove, so convert the airflow before checking it.
Volume flow, not mass flow
These units describe volume per unit time. For gases the volume changes with pressure and temperature, so a flow quoted at standard conditions is not the same as the same number at operating conditions.
Unit factors
Every unit in terms of the base unit shown. To convert, multiply by the factor of the unit you have and divide by the factor of the unit you want.
| Unit | Equals | What it is |
|---|---|---|
| L/s | 0.001 m³/s | Litre per second. |
| m³/h | 0.0002777777778 m³/s | Cubic metre per hour. Fans, pumps and ventilation. |
| m³/s | 1 m³/s | Cubic metre per second, the SI unit of volumetric flow. |
| CFM | 0.0004719474432 m³/s | Cubic feet per minute. Fan and air-handling ratings. |
| L/min | 1.666666667 × 10⁻⁵ m³/s | Litre per minute. |
| m³/min | 0.01666666667 m³/s | Cubic metre per minute. |
| GPM | 6.30901964 × 10⁻⁵ m³/s | US gallons per minute. Pump ratings. |
Conversion pages
Frequently asked questions
What is the formula to convert m³/h to CFM?
CFM = m³/h × 0.5885777787. For example, 500 m³/h is 294.2888893 CFM.
How do I convert CFM back to m³/h?
m³/h = CFM × 1.699010796. The Swap button above reverses the direction for any pair of units.
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