Conversions
Volume converter
Convert volume measurements from cubic metres into common metric and imperial units.
Calculators / Science / Ventilation air changes
Ventilation air changes calculator
Convert an airflow rate and room volume into nominal air changes per hour.
On this page
Nominal air changes per hour51/h
Airflow per minute5m³/min
Calculator controls
How to calculate
Convert an airflow rate and room volume into nominal air changes per hour.
Nominal air changes per hour =
q/v 1/hAirflow per minute =
q/60 m³/minWorked example
- Airflow rate (m³/h): 300
- Room volume (m³): 60
- Nominal air changes per hour: 5 1/h
- Airflow per minute: 5 m³/min
Assumptions and limits
This volume ratio does not describe actual mixing, filtration, contaminant clearance or compliance with any ventilation standard. Use measured effective airflow.
Results are rounded for display; calculations use unrounded values. Read our calculation methodology.
Understanding the result
Convert an airflow rate and room volume into nominal air changes per hour. Keep airflow in cubic metres per hour and volume in cubic metres. Do not add supply and exhaust rates for the same air stream.
When this tool is useful
Keep airflow in cubic metres per hour and volume in cubic metres. Do not add supply and exhaust rates for the same air stream.
Understanding your inputs
| Input | Example |
|---|---|
Airflow rate (m³/h) q | 300 |
Room volume (m³) v | 60 |
Frequently asked questions
What does this model leave out?
This volume ratio does not describe actual mixing, filtration, contaminant clearance or compliance with any ventilation standard. Use measured effective airflow.
How do I reproduce the example?
Enter the displayed example values in their labelled units. Apply the formula before rounding; change one input at a time to compare scenarios.