Awg wire gauge chart & standards

American wire gauge norme sizes, diameters, resistances et ampacities.

awgwiregauge

Overview

The American Wire Gauge (AWG) system is the standard for measuring wire sizes in North America. Smaller AWG numbers indicate larger wire diameters.

Key relationships:

Every 6 gauge decrease doubles the wire diameter
Every 3 gauge decrease doubles the cross-sectional area
AWG 0000 (4/0) is the largest standard gauge (11.684 mm diameter)

AWG Wire Table

17 lignes

AWG wire sizes — copper conductor at 20°C
AWG	Diameter(mm)	Area(mm²)	Resistance(Ω/km)	Ampacity (60°C)(A)
0	8.251	53.49	0.3224	150
1	7.348	42.41	0.4066	130
2	6.544	33.63	0.5127	115
4	5.189	21.15	0.8152	85
6	4.115	13.3	1.296	65
8	3.264	8.366	2.061	50
10	2.588	5.261	3.277	35
12	2.053	3.309	5.211	25
14	1.628	2.081	8.286	20
16	1.291	1.309	13.17	0
18	1.024	0.823	20.95	0
20	0.812	0.518	33.31	0
22	0.644	0.326	52.96	0
24	0.511	0.205	84.22	0
26	0.405	0.129	133.9	0
28	0.321	0.081	212.9	0
30	0.255	0.0509	338.6	0

Source: engineeringtoolbox.com / NEC

AWG Formulas

Wire diameter for a given AWG number $n$ :

$d_n = 0.127 \times 92^{\frac{36-n}{39}} \text{ mm}$

Cross-sectional area:

$A_n = \frac{\pi}{4} d_n^2$

Common Applications

AWG Range	Typical Use
0000–0	Service entrance, feeders
1–4	Large appliances, sub-panels
6–10	Ranges, dryers, A/C units
12–14	General household circuits
16–18	Extension cords, fixtures
20–26	Electronics, low-voltage
28–40	Signal wire, coils

Note: Ampacity values vary significantly based on insulation type, ambient temperature, conduit fill, and installation method. Always refer to NEC tables for actual design.

Source: engineeringtoolbox.com