CMH to CFM Calculator
Cubic metres per hour to CFM.
Enter your values
Enter the airflow in CMH.
Results update instantly as you type — no submit needed. Your values are remembered on this device, and the shareable link reopens the calculator with exactly these numbers.
- Airflow
- 294.3 CFM
- In L/s
- 138.9
- In CMM
- 8.33
- In CMH
- 500
Quick answer
One cubic metre per hour equals 0.588578 CFM.
CFM = CMH x 0.588578
At a glance
| What it does | Cubic metres per hour to CFM. |
|---|---|
| Category | HVAC & Airflow |
| Inputs needed | Airflow |
| Main output | Airflow |
| Formula | CFM = CMH x 0.588578 |
| Cost | Free — no sign-up, no download |
How to use the CMH to CFM Calculator
- 1Enter the metric airflow in CMH.
- 2Read the CFM equivalent.
- 3Cross-check L/s if your code uses it.
Inputs explained
- Airflow(CMH)
- Enter the airflow in CMH.
Worked example
Using the values the calculator loads with:
Inputs
- Airflow500 CMH
Results
- Airflow294.3 CFM
- In L/s138.9
- In CMM8.33
- In CMH500
Frequently asked questions
Why do specs differ so much?
Free-air ratings ignore duct resistance; installed airflow is usually 20-40% lower.
Rounding?
Using 0.59 is accurate to within a fifth of a percent.
What do I need to enter into the CMH to CFM Calculator?
Just 1 value: airflow. Every field starts with a realistic example, so you can change one number at a time and watch the result update instantly.
How does the CMH to CFM Calculator work out the answer?
One cubic metre per hour equals 0.588578 CFM. It applies the formula CFM = CMH x 0.588578 and shows the working so you can check each step by hand.
Is the CMH to CFM Calculator free, and do I need an account?
It is completely free with no sign-up, no download and no usage limit. Everything is calculated in your browser, so the numbers you type never leave your device.
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.