CFM to m³/h Calculator: Convert Cubic Feet per Minute to Cubic Meters per Hour
Use this calculator to convert airflow from Cubic Feet per Minute (CFM) to Cubic Meters per Hour (m³/h), ideal for comparing flow rates between imperial and metric systems.
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Understanding CFM to m³/h Conversion
Airflow is a critical parameter in pneumatic systems, HVAC design, industrial process control, and more. While CFM (Cubic Feet per Minute) is widely used in North America, the metric equivalent — m³/h (Cubic Meters per Hour) — is standard in most international applications. Accurate conversion between these two units ensures compatibility, performance, and efficiency in equipment and system design.
Conversion Formula
The conversion from CFM to m³/h is simple and based on standard unit conversions:
m³/h = CFM × 1.699
This is derived from:
- 1 cubic foot = 0.0283168 cubic meters
- 1 minute = 1/60 hours → multiply by 60
- So, m³/h = CFM × 0.0283168 × 60 = CFM × 1.699
Example Conversions
- 10 CFM = 16.99 m³/h
- 50 CFM = 84.95 m³/h
- 100 CFM = 169.9 m³/h
- 250 CFM = 424.75 m³/h
- 500 CFM = 849.5 m³/h
Why Convert CFM to m³/h?
- Global Equipment Integration: Tools or compressors manufactured overseas often use m³/h ratings.
- HVAC and Duct Design: International ventilation codes frequently specify air flow in m³/h.
- Compliance and Documentation: Engineering standards and audits may require metric units.
- Project Collaboration: Engineering teams in mixed-unit countries must convert airflow values.
Practical Use Cases
- Industrial Ventilation: Air handlers and fans sized in m³/h must be compared with ductwork specified in CFM.
- Compressed Air Systems: Global pneumatic systems require airflow alignment across units.
- Manufacturing Equipment: CNC machines, blowers, dryers, and filters often specify different airflow units.
- Environmental Monitoring: Emission systems may require airflow in both metric and imperial units for reporting.
Unit Comparison: CFM vs m³/h
| Attribute | CFM | m³/h |
|---|---|---|
| System | Imperial | Metric (SI) |
| Region | USA, Canada | Europe, Asia, global |
| Time Scale | Per Minute | Per Hour |
| Conversion | 1 | × 1.699 |
Common Mistakes to Avoid
- Confusing m³/h with m³/min — they're 60× different.
- Mixing SCFM (standard) and actual CFM values without adjusting for pressure and temperature.
- Failing to convert units before specifying duct size or motor power.
Best Practices
- Use clear labeling on documentation showing both CFM and m³/h.
- Maintain consistency in units across all equipment specs.
- Double-check conversions when importing/exporting machinery.
- Consider altitude and temperature if calculating SCFM or ACFM instead of volumetric flow.
Frequently Asked Questions
Q: What is the difference between m³/h and m³/min?
m³/min is a higher flow rate unit — multiply m³/min by 60 to get m³/h. This calculator specifically converts CFM to m³/h.
Q: What’s the difference between SCFM and CFM?
SCFM is standardized (corrected for pressure/temperature). CFM is raw volumetric flow. This calculator assumes standard conditions for simplicity.
Q: Can I use this calculator for gas flow?
Yes, if you’re only converting volumetric flow. For mass flow, consult ACFM or actual conditions-based calculators.
Q: Do I need to round for engineering calculations?
Use at least 2 decimal places for precision, especially in industrial and HVAC system design.
Conclusion
Whether you're working with compressors, fans, pneumatic tools, or ventilation systems, the ability to convert CFM to m³/h ensures proper system integration and performance. In global operations where metric and imperial units coexist, this calculator bridges the gap and simplifies engineering tasks. With just a single value, you can easily match equipment specs, optimize airflow, and communicate across technical teams with confidence.