NEC‑based cable sizing, in seconds.

Calculate ampacity and voltage drop with ambient temperature, grouping, installation type, material, and more — privately on device.

App: Home showing power and cable input settings App: Recommended cable result card

Built for real‑world installs

NEC‑based guidance

Recommendations derive from National Electrical Code tables and common practice. Always verify with local codes.

Derating factors

Ambient temperature, grouping, and installation types are factored into the ampacity calculation.

Voltage drop

Enter cable length and see the drop in volts and percent for the recommended size.

Flexible inputs

Choose a motor template (kW, efficiency, PF) or enter voltage and current directly (3ɸ or 1ɸ).

Materials & ratings

Copper or aluminum conductors, 75°C or 90°C insulation ratings.

Clear basis of design

See base ampacity, reduction factor, final ampacity per run, and voltage‑drop summary.

Screenshots

Screenshot 1
Home — Power & Cable inputs

Tip: use your keyboard ← / → to browse.

Method

  • Start from base ampacity for the chosen conductor and temperature rating.
  • Apply reduction factors for ambient temperature, grouping, and installation type.
  • Compare required current (optionally including 1.25× FLA for motors) to reduced ampacity.
  • Evaluate voltage drop for the selected length and material; confirm it’s within your target limit.

All calculations are performed locally on your device — no account, no upload.

Disclaimer

This app provides NEC‑based guidance for informational purposes and does not replace professional engineering judgment or local code review. Always verify cable sizing with the authority having jurisdiction and applicable standards.

Read our privacy policy

FAQ

Does the app work offline?
Yes. All calculations happen on device and the app works without an internet connection.
What standards does it reference?
Values are derived from National Electrical Code tables and common practice. Always cross‑check against your project specifications.
Do you collect any personal data?
No. User inputs are stored locally on your device. See the Privacy page for details.
Can I enter my own voltage and current?
Yes. Use manual power settings for either three‑phase or single‑phase systems.

Contact

Questions, feature requests, or feedback? Email info@hakllc.com.