Wire Gauge & Size Calculator

Wire Gauge Calculator

Find the minimum safe wire size in seconds. Enter voltage (V), current (A), run length (ft/m), and allowable voltage drop (%) — the app returns the smallest conductor that satisfies both voltage drop and ampacity, and shows you which one set the size.

New in this version

• IEC (mm²) sizing — now alongside NEC (AWG/kcmil); switch standards in one tap

• Ampacity check — sizes by current-carrying capacity, not just voltage drop

• More accurate AC — power factor, conductor temperature, and reactance

• Continuous load (125%), insulation rating, and installation-method options

Features

• Results in AWG/kcmil, inch, mm, and sq.mm at a glance

• Conductor materials: Copper, Aluminum & Steel

• Multiple parallel conductors per phase

• DC, AC single-phase, and three-phase (3- & 4-wire)

• Quick-pick common supply voltages + shareable results

Perfect for

• Low-voltage DC — automotive, RV, solar

• Residential AC — single-phase 120 V / 230 V

• Industrial three-phase — 480 V (US) / 400 V (EU)

• Long-distance power runs

Always verify results against your local electrical code.