Wire Gauge Calculator

Wire Gauge Calculator supports engineering calculations with transparent assumptions, practical result interpretation, and links to next-step technical resources.

Known Parameter

Input Value

AWG Visual Scale

Wire Gauge

Awaiting Input

Enter a known value to convert all wire metrics

AWG is logarithmic and inverse: smaller AWG number means larger conductor diameter. The calculator converts between AWG, diameter, cross-sectional area, and circular mil values.

Converted Results

Nearest AWG

Calculated AWG (Exact)

Diameter (mm)

Diameter (in)

Cross-Sectional Area (mm²)

Cross-Sectional Area (in²)

Circular Mil Area (CMIL)

AWG Conversion Fundamentals

AWG is logarithmic and inverse. As AWG number decreases, conductor diameter and cross-sectional area increase. This calculator applies standard AWG geometry equations for consistent conversions.

Diameter Formula

d(in) = 0.005 × 92^((36 − AWG) / 39)

Used to map AWG directly to nominal bare conductor diameter.

Area Relationship

A = π × d² / 4, Circular mil = (d in mils)²

Supports mm², in², and CMIL conversion in both directions.

Common AWG Reference Table

Quick sizing reference for typical industrial wire classes from large feeder conductors to fine control wiring.

AWG	Diameter	Area (mm²)	Circular Mil	Typical Use
4/0 AWG	11.684 mm	107.2193 mm²	211,600	High-current feeder and bus links
3/0 AWG	10.4049 mm	85.0288 mm²	167,806.43	Main DC power distribution
2/0 AWG	9.2658 mm	67.4309 mm²	133,076.55	Battery and inverter cable assemblies
0 AWG	8.2515 mm	53.4751 mm²	105,534.5	High-load cabinets and power trunks
2 AWG	6.5437 mm	33.6308 mm²	66,371.3	Power branch circuits
4 AWG	5.1894 mm	21.1506 mm²	41,741.32	Motor feeders and distribution branches
6 AWG	4.1154 mm	13.3018 mm²	26,251.37	Industrial panel mains
8 AWG	3.2636 mm	8.3656 mm²	16,509.65	Medium-load machine supply
10 AWG	2.5882 mm	5.2612 mm²	10,383.02	Power circuits and grounding
12 AWG	2.0525 mm	3.3088 mm²	6,529.95	Control cabinet branch power
14 AWG	1.6277 mm	2.0809 mm²	4,106.72	General machine wiring
16 AWG	1.2908 mm	1.3087 mm²	2,582.74	I/O and sensor power wiring
18 AWG	1.0237 mm	0.823 mm²	1,624.3	Signal and low-current control
20 AWG	0.8118 mm	0.5176 mm²	1,021.53	Instrumentation and internal harness
22 AWG	0.6438 mm	0.3255 mm²	642.45	Low-current logic and communication
24 AWG	0.5106 mm	0.2047 mm²	404.04	Fine signal and electronics interconnect

Input Strategy for Fast Conversion

Use AWG input when you already have a wire spec from BOM, terminal labels, or harness drawings.

Use diameter or area input when measuring existing wire or comparing metric and imperial datasheets.

Use circular mil when working with legacy North American references or conductor fill calculations in older documentation.

Engineering Notes and Limits

Conversion result is geometric equivalence only and does not include insulation thickness.

Current carrying capacity depends on insulation class, ambient temperature, bundling, and installation method.

Always verify local electrical code and equipment terminal compatibility before release.

Wire Selection Matrix by Application

Use conversion output as a baseline, then validate electrical, thermal, and mechanical requirements for final wire selection.

Scenario	Typical Gauge Range	Primary Priority	Design Note
Panel main feed and high current branch	4 AWG to 4/0 AWG	Current capacity and thermal rise	Validate terminal lugs, bend radius, and cabinet routing space.
General machine power and actuator supply	10 AWG to 16 AWG	Voltage drop over cable run length	Check run length and derate for bundled cabling.
PLC I/O and low-current control wiring	18 AWG to 24 AWG	Noise immunity and connector compatibility	Pair shield strategy with grounding method for stable signals.