Volumetric flow rate measures the volume of a fluid that passes through a given cross-section per unit of time. In engineering, the cubic meter per hour (m³/h) is the standard SI-derived unit, frequently utilized in industrial process piping, water treatment, and HVAC system design within metric-compliant regions.
Conversely, the cubic foot per minute (CFM) is the imperial standard, predominantly used in North American manufacturing, pneumatic systems, and ventilation engineering. Converting between these units is essential when integrating international equipment or interpreting global technical specifications.
Key Applications
HVAC Systems: Calculating air exchange rates in commercial buildings.
Process Engineering: Sizing pumps and compressors for chemical fluid transfer.
Pneumatics: Determining the capacity requirements for compressed air supply lines.
The conversion factor is derived from the relationship where \(1 \text{ m}^3 \approx 35.3147 \text{ ft}^3\) and \(1 \text{ hour} = 60 \text{ minutes}\). Thus, the conversion factor is \(\frac{35.3147}{60} \approx 0.5885777789409017\).
Cubic meter per hour to Cubic foot per minute Conversion Reference Table
Cubic meter per hour (m³/h)
Cubic foot per minute (CFM)
0.1
0.0589
0.5
0.2943
1.0
0.5886
2.0
1.1772
5.0
2.9429
10.0
5.8858
20.0
11.7716
50.0
29.4289
100.0
58.8578
500.0
294.2889
1000.0
588.5778
Conversion Example: 10 m³/h to CFM
To convert a flow rate from m³/h to CFM, multiply the value by the conversion factor of 0.5885777789409017.
CFM is the legacy standard in North American building codes and equipment manufacturing. Most ductwork sizing charts and fan performance curves in the US are calibrated in cubic feet per minute, making it the practical choice for local contractors and engineers.
For most industrial applications, rounding to four decimal places (0.5886) is sufficient. However, for high-precision instrumentation or critical fluid dynamics calculations, use the full factor of 0.5885777789409017 to minimize cumulative rounding errors.
"On fait la science avec des faits, comme on fait une maison avec des pierres ; mais une accumulation de faits n'est pas plus une science qu'un tas de pierres n'est une maison." "Science is built up of facts, as a house is built of stones; but an accumulation of facts is no more a science than a heap of stones is a house." — Henri Poincaré (French Mathematician, Theoretical Physicist & Mining Engineer)