AWG to mm² (Cross-Sectional Area) Conversion
Quick answer
- Look up your AWG value in the reference table to find the equivalent conductor area in square millimetres (mm²).
- For stranded wire, use Access Communications' stranded wire calculator instead.
While diameter is what you measure physically, cross-sectional area (mm²) is what determines current-carrying capacity, voltage drop and electrical resistance. Australian cable is commonly specified in mm² rather than AWG, so this conversion is essential when comparing imported cable to local equivalents.
AWG to mm² Reference Table
Use the table below as a quick reference to find the American Wire Gauge (AWG) value for a known conductor cross-sectional area in square millimetres (mm²), or vice versa.
| Conductor Area (mm²) | AWG Value | Conductor Area (mm²) | AWG Value | Conductor Area (mm²) | AWG Value | Conductor Area (mm²) | AWG Value |
|---|---|---|---|---|---|---|---|
| 135.10 | 5/0 | 10.60 | 7 | 0.823 | 18 | 0.0646 | 29 |
| 107.20 | 4/0 | 8.35 | 8 | 0.653 | 19 | 0.0503 | 30 |
| 85.00 | 3/0 | 6.62 | 9 | 0.519 | 20 | 0.0400 | 31 |
| 67.50 | 2/0 | 5.27 | 10 | 0.412 | 21 | 0.0320 | 32 |
| 53.40 | 0 | 4.15 | 11 | 0.325 | 22 | 0.0252 | 33 |
| 42.40 | 1 | 3.31 | 12 | 0.259 | 23 | 0.0200 | 34 |
| 33.60 | 2 | 2.63 | 13 | 0.205 | 24 | 0.0161 | 35 |
| 26.70 | 3 | 2.08 | 14 | 0.163 | 25 | 0.0123 | 36 |
| 21.20 | 4 | 1.65 | 15 | 0.128 | 26 | 0.0100 | 37 |
| 16.80 | 5 | 1.31 | 16 | 0.102 | 27 | 0.00795 | 38 |
| 13.30 | 6 | 1.04 | 17 | 0.0804 | 28 | 0.00632 | 39 |
Common Cable AWG to mm² Conversions
The most frequent conversions Australian installers need:
| Cable Type | AWG | Area (mm²) |
|---|---|---|
| Cat5e network cable | 24 AWG | 0.205 mm² |
| Cat6 / Cat6A network cable | 23 AWG | 0.259 mm² |
| Telephone wire | 22 AWG | 0.325 mm² |
| Speaker cable (light) | 18 AWG | 0.823 mm² |
| Speaker cable (heavy) | 14 AWG | 2.08 mm² |
| Mains power cord | 14-12 AWG | 2.08-3.31 mm² |
Why mm² Matters for Cable Selection
Cross-sectional area determines a cable's electrical capacity in ways that diameter alone doesn't capture. Specifically:
- Current-carrying capacity: Australian standard AS/NZS 3008 specifies maximum current ratings based on conductor area in mm²
- Voltage drop: Critical for PoE installs, where insufficient area causes camera or AP failures over long runs
- Resistance: Lower area = higher resistance per metre
- Compliance: Australian electrical regulations reference mm² for installations covered by AS/NZS 3000
Related Calculators & References
- AWG Overview - understand the AWG system and conversion basics
- AWG Calculator by Diameter - find AWG from a known diameter in mm
- AWG Calculator for Stranded Wire - equivalent AWG for stranded conductors
- How to Calculate Cable Area - step-by-step area formulas
- How to Calculate Cable Diameter - find overall diameter of stranded cable
- AWG Reference Table - complete specs including weight and DC resistance
Frequently Asked Questions
How do I convert AWG to mm²?
Look up the AWG value in the reference table above to find the equivalent cross-sectional area in mm². For example, 14 AWG = 2.08 mm², and 24 AWG = 0.205 mm².
What is 14 AWG in mm²?
14 AWG wire has a cross-sectional area of 2.08 mm². This is commonly used for heavy-duty speaker cable and mains power leads.
What is 18 AWG in mm²?
18 AWG wire has a cross-sectional area of 0.823 mm². Common for low-voltage lighting and light-duty audio.
What is 22 AWG in mm²?
22 AWG wire has a cross-sectional area of 0.325 mm². Common in security and alarm cable.
What is 24 AWG in mm²?
24 AWG wire has a cross-sectional area of 0.205 mm². Standard for Cat5e network cable conductors.
Why does Australian cable use mm² instead of AWG?
Australia officially uses the metric system, and AS/NZS 3008 specifies current-carrying capacity based on mm² conductor area. Most networking and imported cable is specified in AWG, so Australian installers need to convert between the two.
Is mm² the same as cross-sectional area?
Yes. mm² (square millimetres) is the unit used to measure cross-sectional area of a conductor. It's the surface area you'd see if you cut the wire perpendicular to its length.
How does cross-sectional area relate to wire diameter?
Area = π × (Diameter/2)². For example, a 1mm diameter wire has an area of 0.785 mm². See our cable area calculator for the formula and worked examples.
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