Air Changes Per Hour Table: Air changes per hour by Airflow
Reference table of air changes per hour for Air Changes Per Hour across a range of airflow values — exact, engine-computed figures you can read off at a glance.
Air Changes Per Hour Calculator
Verified formula Updated Jun 2026 Private — runs on your device
Verified formula
Private
Air changes per hour
3.33
For general information only — not financial, tax, legal or medical advice. Verify before you rely on it.
How to use the Air Changes Per Hour Calculator
The Air Changes Per Hour Calculator works out your air changes per hour in an instant. Enter airflow and room volume and the result updates as you type — it is free, needs no sign-up, and runs entirely in your browser so your figures stay private.
- Enter the airflow.
- Enter the room volume.
- Read off your air changes per hour — the calculator updates automatically, with no button to press.
Formula
The Air Changes Per Hour Calculator uses the formula:
Air changes per hour = Airflow ÷ Room volume
Worked example
For example, with airflow of 200 m³/h and room volume of 60 m³, the air changes per hour is 3.33.
| Airflow | 200 m³/h |
|---|---|
| Room volume | 60 m³ |
| Air changes per hour | 3.33 |
|---|
Results are estimates for educational use, not professional advice.
Key terms explained
- Volume
- The amount of three-dimensional space an object occupies, measured in cubic units.
Frequently asked questions
Divide hourly airflow by room volume. 200 m³/h in a 60 m³ room gives about 3.33 air changes per hour.
It varies by room use. Living spaces may need a few, while kitchens and labs need many more.
Convert CFM to m³/h by multiplying by about 1.699, or keep consistent units throughout.
Good air exchange removes moisture, odours and pollutants, keeping indoor air healthy.
Enter the airflow. Enter the room volume. Read off your air changes per hour — the calculator updates automatically, with no button to press.
Related guides
How to Calculate Air Changes Per Hour: Formula, Steps & Examples
Learn how to calculate Air Changes Per Hour — the formula explained step by step, with worked examples and a free calculator to check your answer.