Air Change Per Hour Calculator



Calculating the Air Change Per Hour (ACH) is crucial for maintaining optimal air quality in enclosed spaces. Whether you’re an HVAC professional or someone concerned about the air circulation in your home, an accurate ACH calculation is essential. This article will guide you through creating a simple yet powerful ACH calculator using HTML and JavaScript.

How to Use

To use the Air Change Per Hour Calculator, enter the required information in the designated input fields. Click the “Calculate” button, and the result will be displayed instantly. This tool is user-friendly, providing a quick and efficient way to estimate air changes per hour based on your specific parameters.


The formula for calculating Air Change Per Hour is as follows:


  • is the Air Change Per Hour.
  • is the volume of air circulated per minute in Cubic Feet per Minute (CFM).
  • is the total volume of the room in cubic feet.


Suppose you have a room with an air flow of 300 CFM and a volume of 1500 cubic feet. The calculation would be:

Therefore, the Air Change Per Hour for this room is 12.


Q: Why is ACH important?

A: ACH is crucial for determining how frequently the air within a space is replaced. It helps maintain a healthy indoor environment by preventing the buildup of pollutants and ensuring proper ventilation.

Q: Can this calculator be used for residential purposes?

A: Yes, this calculator is versatile and can be applied to both residential and commercial settings. It provides valuable insights for anyone concerned about air quality.

Q: What are typical ACH recommendations for different spaces?

A: Recommendations vary, but common values are 4-6 ACH for homes, 6-12 ACH for offices, and higher rates for healthcare facilities.


The Air Change Per Hour Calculator simplifies the process of evaluating ventilation needs, offering a valuable tool for maintaining air quality. Whether you’re designing HVAC systems or optimizing your living space, this calculator ensures that you can make informed decisions about air circulation.

Leave a Comment