Conduit Fill Percentage Calculator

Calculate geometric cable occupancy from conduit inner diameter and equal cable sizes. This is area occupancy only, not a code-compliance or cable-pulling approval. This browser-local calculator updates from numeric inputs and shows a labelled breakdown without uploading your data.

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Result

Worked examples

Conduit inside diameter (mm) 25 · Cable outside diameter (mm) 6 · Number of cables 3

First calculated quantity: 490.874 mm²

Calculate geometric cable occupancy from conduit inner diameter and equal cable sizes. This is area occupancy only, not a code-compliance or cable-pulling approval.

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