Voltage Drop Calc NEC & IEC

Check percent drop in one tap — NEC and IEC in the same app, copper or aluminum, single or three phase, plus the minimum size that passes.

The field electrician's voltage-drop calculator — NEC and IEC in one honest tool.

Enter system voltage, load current and one-way run length, pick the conductor, and read the drop in volts, the percentage and a clear verdict against the 3% / 5% recommendation. Switch between NEC (AWG/kcmil, K-factor method, feet) and IEC 60364 (mm², resistivity method, meters) — copper and aluminum, single-phase and three-phase, adjustable power factor.

PRO • Both standards in one app • Reverse sizing: enter a target % and get the smallest conductor that passes, with ampacity and breaker suggestion • Save calculations to history • Share clean PDF reports

Built for gloves and sunlight: big keypad, huge results, Outdoor Bright mode.

Everything stays on your phone — fully offline, no account, no tracking.

Results are planning estimates; always verify with your local code authority.

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