Conduit Fill Calculator

Reference tool only. Conductor and conduit area values below are representative/typical figures for planning purposes. Always verify actual areas against the current edition of CSA C22.1 Tables 6, 8, 9 and 10 (or the manufacturer's data for the specific insulation/cable) before finalizing a design. Whole-cable entries are taken from a project-specific cable schedule and should be re-verified against that source.

ConduitType, trade size, nipple

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Equipment / raceway tag Conduit type Trade size (metric designator) Nipple (raceway run ≤ 600 mm) — allows 60% fill

Metric designators shown correspond to common imperial trade sizes: 16→½", 21→¾", 27→1", 35→1¼", 41→1½", 53→2", 63→2½", 78→3", 91→3½", 103→4", 129→5", 155→6".

Conductors & CablesAdd individual conductors or whole multiconductor cables

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Insulation Size Qty

This is a bonding/grounding conductor Bare (no insulation) — uses conductor metal area only

Result — Conduit Fill

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% fill (actual)

Max allowed fill

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Conductor/cable count

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Total conductor area

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Conduit internal area

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Conduit inner diameter (ID)

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Conduit outer diameter (OD)

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Cross-Section

to scale, illustrative packing

Cable Construction Reference

schematic — see manufacturer link for the actual product photo

Include Calculation Ledger in report Include item list in report Include OhmZone brand mark in report

Report template (.docx, optional)

Calculation Ledger

CEC Table 8/9 method

CEC Table 8 — Maximum Fill

Number of conductors	Max fill