Free browser-based conduit fill calculator showing fill percentage, applicable NEC limit and an over-limit result.
About WiringCalc
WiringCalc estimates conduit fill from the selected conduit and conductor list. It reports fill percentage and the applicable NEC limit. It is a browser-local calculator, not a certification or substitute for qualified engineering advice; verify installation requirements with the relevant authority having jurisdiction.
✓ VerifiedOct 12, 2026
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