How is AWG wire size calculated?

In the American Wire Gauge system, diameters are computed with the formula D(AWG) = .005 * 92^((36-AWG)/39) inch. For sizes like 00, 000, and 0000, the same formula applies, with the gauge treated as a negative number.

What wire size do I need for 200 amp service?

For a 200-amp service, use #4 AWG copper wire, or #2 AWG aluminum or copper-clad aluminum.

What does AWG mean on wire?

AWG stands for American Wire Gauge, the standard used in the United States to specify the diameter of electrical conductors.

What is the difference between 1 AWG and 1/0 AWG?

1/0 AWG is one wire size larger than 1 AWG, meaning it has a larger diameter and a wider current-carrying capacity. The '/0' designation indicates a size larger than 1 AWG.

Wire AWG Size Conversion Calculator

Convert wire sizes across AWG, metric area, circular mils, and more. Enter a known size or diameter to automatically see equivalent measurements.

Wire Size Parameters

Results are rounded to the nearest wire gauge

Result: — AWG

Introduction

AWG to Metric Conversion Guide: Wire Sizes Explained

Navigating between American Wire Gauge (AWG) and metric measurements ( $mm$ or $mm^2$ ) can be challenging. While AWG is the standard in North America, the UK and the rest of the world typically use the metric system.

Whether you are an American customer faced with metric options, or a UK customer trying to match a specific AWG requirement, this guide bridges the gap.

Quick Conversion Table: AWG to Metric

Use this table to find the closest standard metric cable size for your AWG requirement. Note that AWG does not convert perfectly to metric round numbers; we have recommended the closest suitable "Available Cable Size" for purchase.

AWG #	Diameter (mm)	Area (mm²)	Recommended Metric Size
4/0 (0000)	11.68	107.22	120 $mm^2$
3/0 (000)	10.40	85.03	95 $mm^2$
2/0 (00)	9.27	67.43	70

⚠️ Safety Note: For mains voltage applications (110v, 230v, etc.), we suggest a minimum conductor size of 0.5mm² (AWG 23 and up). Smaller cables (AWG 24-40) are generally reserved for low-voltage applications such as audio, video, telephone, and data signal cabling.

Understanding the AWG Standard

The American Wire Gauge (AWG) system was developed by the Brown & Sharpe Company—a leading manufacturer of machinist technology—and was formally adopted as an industry standard in 1857.

Unlike metric sizing, where the number represents the actual size (width or area), AWG is a "retrograde" system: the higher the number, the thinner the wire.