Working browser tool
Air Changes Per Hour Calculator
Calculate ACH from room volume and measured supply airflow.
Enter your values
Your inputs are processed locally. Review the method and limitations before relying on the estimate.
Your result
Worked example
A 5×4×3 m room has 60 m³ volume; 600 m³/h equals 10 ACH.
Frequently asked questions
Is this a professional specification?
No. It is a planning estimate based on the numbers you enter; verify manufacturer guidance and applicable standards.
Does it use live location prices or conditions?
No. Enter actual prices, weather or site inputs; there are no live data calls.