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Duct Size Calculator

Note: Duct Dimensions are always Inner Dimensions

Ductulator

Instructions:

  1. Review the methodology (coming soon) to ensure it aligns with your project's requirements.

  2. Select English or Metric Units

  3. Select Material Type from the dropdown menu.  (Note, the button next to the selection field will bring you to a specification sheet for the material type you selected).

  4. Enter the air volume in CFM [l/s].

  5. Select an input criteria and enter its value.

  6. Optional: Enter a constraining rectangular duct dimension in inches [cm]

  7. Click the Calculate button

  8. The results are displayed in the results table.

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Ductulator  Demonstration Video
Graph showing Interpolation

 

©2014-2025 by Adicot, Inc.

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Adicot, Inc.'s calculators are intended for professionals. Adicot, Inc. makes no warranty of any kind, expressed or implied, concerning the information contained on this website. The information presented on this website shall be used by professionals who understand the implications of the results. If professional services are required, please consult a licensed professional engineer in your location, as building codes differ based on differing jurisdictions. The author and publisher shall not be liable in the event of damages of any kind in connection with, or arising from, the use of the information contained within this website.  Any use of this website, including the calculators, is at the user’s sole risk. Use of the website, including the calculators, in any way shall constitute an acknowledgment and acceptance of the foregoing.

​The calculators' accuracy is dependent on user-supplier data. It is the user's responsibility to understand how the data entered affects calculator output. The calculation results are meant to aid the designer and are not a substitute for professional design service, judgment, or experience. The user accepts all responsibility for any claims, actions, or damages from using the calculators.

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