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Conduit Fill Calculator — Wire & Cable Raceway Fill

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Diameter unit Raceway inside diameter Use actual verified ID.Group 1 cable OD Group 1 quantity Group 2 cable OD Group 2 quantity Group 3 cable OD Group 3 quantity Fill rule Qualifying nipple ≤24 in Custom fill limit (%) Used only in custom mode.

Calculated result

12% fill — PASS

Total conductor/cable area: 0.0942 in²

Raceway internal area: 0.7854 in²

Applied fill limit: 40% (conductor-count preset)

Spare fill percentage: 28 points

Minimum ideal circular raceway ID at this limit: 0.548 in

Show the working

1. Conductor area = Σ quantity × π × OD² ÷ 4 = 0.0942 in².
2. Raceway area = π × 1² ÷ 4 = 0.7854 in².
3. Fill = 0.0942 ÷ 0.7854 × 100 = 12%.
4. Required ideal ID = √(4 × 0.2356 ÷ π) = 0.548 in.

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