Conduit Sizing Calculator

The conduit sizing calculator is a helpful tool for engineers to answer questions regarding the size conduit to use per NEC® guidelines. Enter your information in the fields below and click "Calculate" at the bottom of the page. If you want to reset the numbers, click the "Reset" button.

Calculation Results




About the Conduit Sizing Calculator

Did you know that having too many conductors packed into a conduit system can result in damage during the pulling process? Furthermore, because different types of conductors offer a varied thickness of insulation, it's important to determine the cross-sectional area of each conductor used. Ensuring an adequate amount of empty space within a conduit is very for heat dissipation and the ease of installation or removal.

This calculator helps to calculate what size conduit that you need and how many cables will fit in your conduit.

Questions about Conduit Sizing:

  • What is conduit size?
    USA standard trade sizes for conduit are ½, ¾, 1, and all the way up to 4.
  • Can a conduit be too big?
    Yes, it is possible for a conduit to be too big, but it is better to use a conduit that is too big than one that is too small.