ConduitLab: NEC Calculator

See conduit fill before you pull wire. ConduitLab adds a 2D visualizer plus code-based ampacity, voltage drop, and PDF reports.

ConduitLab is a professional NEC electrical calculator for electricians, inspectors, contractors, and engineers. It combines ampacity, voltage drop, conduit fill, wire sizing, PDF reports, and an interactive 2D conduit fill visualizer in one field-ready app.

SEE CONDUIT FILL BEFORE YOU PULL

Most electrical calculators only show a percentage. ConduitLab helps you see the layout.

Use the 2D conduit fill visualizer to view conductors inside the raceway, check fill percentage, spot tight layouts, and use X-Ray mode for a clearer look at packed conduits.

Plan pulls, review layouts, and catch conduit fill problems before the wire is already in the pipe.

CORE ELECTRICAL CALCULATIONS

Ampacity — real-world derating applied
Calculate wire sizing with ambient temperature correction, rooftop exposure adjustments, terminal temperature limits, conductor count effects, and continuous-load factors applied together.

Voltage Drop — catch issues before inspection
Run single-phase and 3-phase voltage drop calculations for branch circuits and feeders, including advanced options for long runs, larger conductors, and field conditions.

Conduit Fill — visual and code-based
Apply NEC Chapter 9 fill limits while using the 2D conduit fill visualizer to better understand how conductors fit inside the conduit.

INSPECTOR-READY PDF REPORTS

Generate clean, professional electrical calculation reports for documentation, submittals, inspections, and permanent records.

Reports can include: • Project inputs and calculated results • NEC-based citations by edition • Ampacity, voltage drop, and conduit fill summaries • Jobsite-ready calculation records • Clean documentation for field review

LITE AND PRO OPTIONS

ConduitLab includes a Lite mode for common residential and light commercial calculations.

ConduitLab Pro unlocks: • Full wire size range up to 2000 kcmil • 3-phase and exact voltage drop tools • Interactive 2D conduit fill visualization • X-Ray conduit visualizer mode • Unlimited PDF exports • Expanded professional features

BUILT FOR JOBSITE USE

• Offline-first calculations • Fast, repeatable results • No account required • Designed for electricians, inspectors, contractors, and engineers • Built for real field workflows, not generic desktop math

IMPORTANT DISCLAIMER

ConduitLab is a reference and documentation tool only. It does not provide engineering services or code-compliance certification. Users are responsible for verifying all results and complying with applicable electrical codes, local amendments, and Authority Having Jurisdiction requirements.

Subscriptions unlock advanced features and unlimited PDF exports.

Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/