Is AWG The Same As MM²

Zhengfeng Jan 17,2026

Our customers often ask whether AWG and mm² are the same when choosing wire sizes. This article will demystify the conversion from AWG to mm², providing you with the necessary basic charts, standards, and practical knowledge.

AWG (American Wire Gauge) and mm² (square millimeters) are two different units of measurement for wire size: AWG uses a logarithmic scale (the larger the number, the thinner the wire, commonly used in North America), while mm² directly measures the cross-sectional area of the conductor (the larger the mm², the thicker the wire, universally used, using metric units). Because they describe wire thickness differently, unit conversion is often necessary. mm² represents physical area, while AWG is a wire gauge number based on manufacturing process, although they correspond to each other.

AWG (American Wire Gauge)

 System: Logarithmic scale; the larger the number, the finer the wire (e.g., 10 AWG is thicker than 20 AWG).

 Origin: Primarily used in the United States and Canada.

 Basis: Determined based on the number of wire pulling processes.

mm² (square millimeter)

 System: Direct measurement of the cross-sectional area of a conductor.

 Source: International Standard (IEC 60228), applicable to most countries in the world that use metric units.

 Basis: Simple physical measurement (e.g., 10 mm² is exactly 10 square millimeters of copper).

Key Differences and Conversions

 Measurement: AWG is the wire gauge number, while mm² is the actual area.

 Conversion: A conversion table is needed to find the equivalent size (e.g., 2.5 mm² is approximately equal to 14 AWG, 10 mm² is approximately equal to 8 AWG).

 Application: Choosing the appropriate size can prevent overheating and voltage drop; thicker wires (larger mm² or smaller AWG) can safely carry larger currents.

**Wire Gauge Conversion Chart**
AWG	mm²	AWG	mm²
30 AWG	0.05 mm²	12 AWG	4 mm²
28 AWG	0.08 mm²	10 AWG	6 mm²
26 AWG	0.14 mm²	8 AWG	10 mm²
24 AWG	0.25 mm²	6 AWG	16 mm²
22 AWG	0.34 mm²	4 AWG	25 mm²
21 AWG	0.38 mm²	2 AWG	35 mm²
20 AWG	0.5 mm²	1 AWG	50 mm²
18 AWG	0.75 mm²	1/0 AWG	55 mm²
17 AWG	1 mm²	2/0 AWG	70 mm²
16 AWG	1.5 mm²	3/0 AWG	95 mm²
14 AWG	2.5 mm²	4/0 AWG	120 mm²

Why Choosing the Right Cable Size is Crucial

Choosing the right cable size is essential for safety, performance, and cost-effectiveness. Thin cables have higher resistance, which can cause voltage drops and overheating under load. This can lead to inefficiency, insulation damage, and in severe cases, even fires. Conversely, thicker cables have lower resistance and can safely carry higher currents.

Seven-Step Cable Selection Checklist

Before finalizing your cable order, quickly complete the following checks:

Determine the current (amperes) required for your application.
Determine the system voltage.
Know the total cable length to account for voltage drop.
Select the appropriate conductor material (copper or aluminum).
Select the appropriate insulation type based on the environment (e.g., PVC, XLPE).
Use a conversion table to match the required AWG and mm² specifications.
Verify the current carrying capacity according to local electrical standards.

Get an accurate quote for your project

Understanding cable standards and ensuring the selection of appropriate components can be complex and time-consuming. Don't worry, let Zhengfeng Wires solve these problems for you.

We are a China Teflon Wire Supplier, Silicone Cable Factory, PVC Wire Manufacturer. Our products strictly adhere to UL international standards. Our cable experts can help you select the most suitable cables based on your project needs, ensuring safety, performance, and compliance.