NEC 2017–2026 · Offline · iOS + Android
Fast NEC calculations for real electrical work.
Ampacity, voltage drop, and conduit fill in one app. Runs offline. Includes visual conduit fill and a clean PDF when you need a record.
Built for fast lookups in the field.
Ampacity in NEC terms.
Temperature, bundling, and rooftop adjustments per NEC 310. Cu and Al, all common insulations.
Voltage drop that matches reality.
AC impedance method with power factor and raceway type — not a DC shortcut.
Conduit fill you can see.
Fill math plus a schematic cross-section and a jam-ratio warning before you pull.
Three calculators, one app.
The numbers electricians actually look up most.
Visual conduit fill, not just a number.
The visualizer gives you a schematic cross-section while the fill calculation updates. It is a planning aid, not a substitute for field judgment.
- Drag and drop conductors
- Layout updates as you change wires
- Jam-ratio warning when the ratio falls into the danger range
- Schematic cross-section of the conductor stack
Recorded from the iOS app.
NEC 2017, 2020, 2023, and 2026.
Pick the code year manually or let the app default based on your region. Override any time.
CEC and IEC support in development.
When a saved PDF is worth it.
You don't always need a report. When you do, you get a clean one — inputs, results, and the conduit cross-section, on one document.
- For your own files — save the inputs, results, and NEC references in one PDF.
- For a PM or office — send the calculation without a screenshot chain.
- For design-build or commercial work — keep a clean record when the math matters.
Frequently Asked Questions
Which NEC code years does ConduitLab support?
NEC 2017, 2020, 2023, and 2026. The app can default to the prevailing code year based on your location, and you can override it any time.
Does ConduitLab work offline?
Yes. Ampacity, voltage drop, and the conduit fill engine all run on your device.
Can I export a calculation as a PDF?
Yes. Any calculation can be exported as a clean PDF — useful for saved records, a PM, design-build coordination, or when you want to "show your work".
Who is this for?
Mainly electricians who want fast, NEC-based answers in the field. Helpful for commercial and industrial work where the conduit fill view and saved calculations come up more often.