// multi-utility computation suite · offline · instant · precise
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tool.electrical-wire-gauge Calculator
Calculates the minimum wire gauge (AWG or mm²) for a given current load and run length, accounting for voltage drop and NEC ampacity tables. Undersized wire is a fire hazard; oversized wire is unnecessarily expensive — the correct gauge balances safety and cost.
Inputs
Current Amps
Rate of charge flow (A). I = V/R. Above ~100 mA through the body can be lethal. Fuses protect against overcurrent.
Length Ft
Linear measurement. Ensure consistent units: 1 m = 1,000 mm = 3.281 ft.
Voltage Drop Pct
Electric potential difference (V). Drives current through a circuit. Household: 120 V (US) or 230 V (EU/UK).
Voltage
Electric potential difference (V). Drives current through a circuit. Household: 120 V (US) or 230 V (EU/UK).
Results
min wire size (AWG)
Sample size or count used in the calculation.
required area (cmil)
The computed two-dimensional surface area.
max voltage drop (V)
Electric potential difference between the two terminals (V). In AC systems, quoted as RMS — 230 V mains has a peak of ~325 V.
current
Electric charge flow rate (A). Governs wire sizing — too much current causes dangerous heating. Fuses protect circuits from overcurrent.