CFM to m3/h Calculator
Use this tool to convert airflow from cubic feet per minute (CFM) to cubic meters per hour (m3/h).
Formula: m3/h = CFM × 1.69901082
What this calculator does
This CFM to m3/h calculator quickly converts airflow values between two common ventilation units. CFM is widely used in the United States, while m3/h is common in Europe and many international engineering specifications. If you work with HVAC systems, fan sizing, dust collection, clean rooms, or industrial ventilation, this conversion helps you compare equipment data sheets accurately.
CFM to m3/h conversion formula
Exact conversion factor
The standard factor is:
- 1 CFM = 1.69901082 m3/h
So, to convert CFM into m3/h, multiply your CFM value by 1.69901082.
Example calculation
Suppose a fan is rated at 800 CFM:
- m3/h = 800 × 1.69901082
- m3/h = 1,359.21
So the same airflow is approximately 1,359.21 m3/h.
Quick reference table
| CFM | m3/h |
|---|---|
| 100 | 169.90 |
| 250 | 424.75 |
| 500 | 849.51 |
| 1,000 | 1,699.01 |
| 2,500 | 4,247.53 |
| 5,000 | 8,495.05 |
Where this conversion is commonly used
1) HVAC design and balancing
Engineers and technicians often receive mixed unit requirements from clients, local standards, and manufacturer catalogs. Converting correctly helps avoid undersized or oversized ductwork and fans.
2) Industrial ventilation
In workshops, laboratories, and production lines, airflow targets are often specified in m3/h, while certain fan models list CFM. This calculator bridges that gap instantly.
3) Air purifier and filtration systems
Comparing CADR or system throughput across global brands can be confusing without unit conversion. Converting CFM to m3/h lets you compare products on equal footing.
Common mistakes to avoid
- Mixing up units: CFM is per minute; m3/h is per hour.
- Using rough factors: 1.7 is fine for quick estimates, but use 1.69901082 for precise work.
- Rounding too early: keep extra decimals during intermediate calculations, then round final output.
- Confusing CFM with SCFM: SCFM is standardized to specific temperature and pressure conditions.
FAQ
Is 1 CFM exactly 1.7 m3/h?
Not exactly. It is very close, but the more accurate factor is 1.69901082. For engineering documentation, use the precise value.
Can I use this for large industrial airflows?
Yes. The math is linear, so the same factor works for small and large values. Just verify whether your project requires actual CFM or standardized SCFM.
How many decimals should I use?
For most practical applications, 1 to 2 decimals is enough. For technical reports, use 3 to 4 decimals. This calculator lets you choose from 0 to 8 decimal places.
Bottom line
If you need to convert airflow from CFM to m3/h, multiply by 1.69901082. Use the calculator above to get instant, accurate results and avoid manual mistakes in HVAC, ventilation, and industrial airflow calculations.