Conduit Fill Calculator

Welcome to the Conduit Fill Calculator website. We hope to provide you with the best online conduit fill calculator, as well as all relevant information regarding conduits, conduit fill, conduit accessories, and more!

This online conduit fill calculator is compatible with the US National Electrical Code (NEC)!

Step One:

Select a conduit type and size

Step Two:

Enter the insulation type, wire gauge, and amount of wires



Total wire area (mm2):

Conduit area (mm2):

Conduit fill (%):  

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Conduit definition

What is a conduit? In the world of electricians, it has the following definition: Conduit (noun): a tube, pipe or duct for protecting electric wires or cables. Types of conduits There are many different types of conduits available, which are used depending on the specific electrical installation needs....


How to Calculate Conduit Fill

Calculating conduit fill is a straightforward process, but important to comply with NEC requirements (National Electrical Code) and avoid expensive rewiring (and most importantly, to keep your electrical installation safe!). The following steps describe these factors and explains how to correctly calculate conduit fill.