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You are here: Home / Air Purifier Tools / Air Changes per Hour (ACH) Calculator from CFM and m³/h

Air Changes per Hour (ACH) Calculator from CFM and m³/h

Updated on February 22, 2022 By Musfikur Rahman · 2 Comments

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You can easily calculate the Air Changes Per Hour (ACH or ACPH) using:

  1. Airflow rate of your Air Purifier / HVAC (CFM or m³/h),
  2. Room area (square footage or L x W), and
  3. Ceiling height.

Calculate the Air Changes Per Hour (ACH or ACPH) from the calculator below:

Air Changes per Hour Calculator - ACH and ACPH

Formula:
ACH = (Airflow in CFM x 60) / (Room Area x Ceiling Height)

Calculate the required CADR for your room: CADR Calculator

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Filed Under: Air Purifier Tools

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Musfikur Rahman

A former smoker, who has become a clean air enthusiast, created this blog to review different types of air purifiers so that you can make an informed decision.

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Comments

  1. Benoit says

    December 6, 2020 at 5:20 pm

    If you have two air purifiers what’s the effect on the air changes per hour and time to clean the room.
    Thanks

    Reply
    • Reviewsofairpurifiers says

      February 18, 2022 at 7:22 am

      For more than one air purifier, use the cumulative airflow rate (CADR) to calculate the air changes per hour. If you have two air purifiers, the number of Air Changes per Hour (ACH) will be doubled, which means it will take half the time to clean the room.

      Reply

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