Conduit Fill Pro - Electrician

The fastest conduit fill calculator built for licensed electricians.

FIND MINIMUM CONDUIT SIZE
Enter your conductors and Conduit Fill Pro instantly shows the minimum legal conduit size for your pull. Know what to order before you order it.

VERIFY ANY FILL INSTANTLY
Select conduit type and size, add conductors, and get an immediate pass/fail result with exact fill percentage and remaining capacity.

BUILT ON NEC 2023
Every result references NEC 2023, Chapter 9, Table 1 (fill limits) and Tables 4 & 5 (areas).

WORKS OFFLINE
All NEC Annex C tables embedded on device. No internet. No account. No sync.

ALL CONDUIT TYPES
EMT · IMC · RMC · PVC Schedule 40

ALL COMMON CONDUCTORS
THHN/THWN-2 · XHHW-2 · RHH/RHW-2 — AWG 14 through 500 kcmil

ONE-TIME PURCHASE — $2.99
Unlock unlimited calculations. No subscription. No ongoing fees.

A FieldMetric tool.

NEC 2023 · Ch.9 Table 1 · Tables 4 & 5
Fill limits: 1 cond = 53% · 2 cond = 31% · 3+ cond = 40%