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EMT is electrical metallic tubing. In the electrical trade there are nominal sizes expressed as a standard size. To answer your question you must state the conduit size in either electrical terms or in standard size terms to get a conversion size.

For example standard size 1/2" EMT has an actual diameter size of 3/4" and the 1/2"EMT connector for the 1/2" EMT conduit needs a 7/8" hole.


Likewise with 3/4" EMT the actual outside diameter is 15/16" and the 3/4" EMT connector needs a 1-1/8" hole.

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