What is AWG (American Wire Gauge)?

AWG is a standardized system for the diameter of round, solid, electrically conducting wire. A lower gauge number means a thicker wire: each 6-gauge decrease roughly doubles the diameter and each 3-gauge decrease roughly doubles the cross-sectional area.

What does 4/0 or 0000 AWG mean?

Sizes larger than 0 AWG use repeated zeros: 00 (2/0), 000 (3/0), and 0000 (4/0). 4/0 is the thickest size in the common AWG range, about 11.7 mm in diameter.

How do I convert AWG to mm?

Diameter in inches equals 0.005 × 92^((36 − n)/39), where n is the gauge number (0 for 0, −1 for 00, −2 for 000, −3 for 0000). Multiply by 25.4 to get millimetres. This page computes it for you.

How much current can an AWG wire carry?

The ampacity values shown are the conservative power-transmission figures (based on roughly 700 circular mils per amp) commonly listed in wire-gauge tables. Real-world limits depend on insulation, ambient temperature, bundling, and the applicable electrical code, so always follow local standards for power wiring.

Is a lower AWG number thicker or thinner?

Lower numbers are thicker. For example, 10 AWG (2.59 mm) is much thicker than 24 AWG (0.51 mm). The scale is logarithmic, so small number changes mean large diameter changes.

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Reference

AWG Wire Gauge Chart

Diameter, cross-sectional area, and approximate current capacity for every American Wire Gauge size from 4/0 (0000) to 40. Type a gauge to look up its values instantly.

AWG number