Ampwright: Electrician Calc

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About this app

Ampwright gives electricians, students and makers exact answers for the calculations used on every job, with no account and no internet connection.

EVERY CORE CALCULATION
• Ohm's law and power — DC, single-phase and three-phase
• Voltage drop, and minimum cable size by voltage drop
• Motor full-load current and transformer short-circuit current
• Power factor correction (capacitor sizing)
• AWG ⇄ mm² conversion and energy cost

BUILT FOR THE FIELD
Switch between IEC (230 V / 50 Hz) and NEC (120 V / 60 Hz) defaults, metric or imperial units, copper or aluminium conductors. Every result shows the formula behind it.

SAVE AND SHARE
Save a result with a name and notes, share it as text, and back it up to another phone.

PAY ONCE, USE ANYWHERE
No ads. No subscription. No account. Ampwright works fully offline and collects or shares no data.

Ampwright computes results from standard electrical formulas for estimation only. It is not a substitute for your local wiring code or a qualified electrician.

What’s new

First release: Ohm's law and power (DC, single-phase, three-phase), voltage drop, minimum cable size, motor current, transformer short-circuit current, power factor correction, AWG ⇄ mm² conversion and energy cost. Save results with notes, share as text, and back up to another phone. Works fully offline with no ads, subscription or account.