AWG to mm² Building Wire Guide: Size Chart & Buyer Checks
A practical comparison of AWG nominal conductor areas, common metric commercial cross-references and the specification checks required before product substitution.
International wire RFQs often mix two size systems: American Wire Gauge (AWG) and metric conductor area in mm². A buyer may send a requirement such as 14 AWG or 12 AWG, while a supplier's building-wire range is organized around 1.5 mm², 2.5 mm², 4 mm², 6 mm² and other metric nominal sizes.
In RFQs and technical correspondence, mm² may also be written as mm2; both refer to square millimetres.
The two systems can be compared by conductor area, but that comparison is only the first step. A rounded AWG-to-mm² cross-reference does not prove that two finished wire products use the same conductor construction, insulation, standard, resistance limits, voltage rating or dimensions.
For procurement, the useful question is therefore not only “What mm² is this AWG?” but also “What metric construction satisfies the original project specification?”
AWG nominal area reference
The nominal cross-sectional area associated with an AWG gauge number.
Common commercial cross-reference
A procurement reference that may pair an AWG size with a familiar nearby metric nominal size.
Finished-wire product equivalence
A technical decision that cannot be confirmed from conductor area alone.
What Is the Difference Between AWG and mm²?
Gauge-number system
- smaller AWG number = larger nominal conductor
- gauge number does not state finished insulated-wire diameter
Nominal conductor area
- directly states conductor cross-sectional area category
- does not by itself define strand construction or finished wire diameter
A buyer therefore should not compare only the printed size. The applicable standard and complete conductor construction still matter. See the building wire size guide for guidance on common metric conductor sizes.
AWG to mm² Chart: Nominal Conductor Area Reference
| AWG | Nominal area reference |
|---|---|
| 18 AWG | 0.823 mm² |
| 17 AWG | 1.04 mm² |
| 16 AWG | 1.31 mm² |
| 15 AWG | 1.65 mm² |
| 14 AWG | 2.08 mm² |
| 13 AWG | 2.62 mm² |
| 12 AWG | 3.31 mm² |
| 11 AWG | 4.17 mm² |
| 10 AWG | 5.26 mm² |
| 9 AWG | 6.63 mm² |
| 8 AWG | 8.37 mm² |
| 7 AWG | 10.55 mm² |
| 6 AWG | 13.30 mm² |
| 5 AWG | 16.77 mm² |
| 4 AWG | 21.15 mm² |
| 3 AWG | 26.67 mm² |
| 2 AWG | 33.62 mm² |
| 1 AWG | 42.41 mm² |
The values are useful when an RFQ, drawing or datasheet uses AWG and the buyer needs to understand the approximate conductor-area scale. They should not be used as a finished-product substitution table.
Why Do Some AWG-to-mm² Charts Show 14 AWG as 2.5 mm²?
Some commercial cable cross-reference charts pair common AWG sizes with nearby metric nominal sizes — for example, 14 AWG with 2.5 mm², 12 AWG with 4 mm² or 10 AWG with 6 mm².
That type of chart is usually used as a commercial cross-reference between two commonly used size series, not as a statement that the conductor areas are mathematically identical.
Those two numbers are not equal.
Where 1.5, 2.5, 4, 6 and 10 mm² Sit Against AWG Sizes
| Metric size | AWG nominal-area position |
|---|---|
| 1.5 mm² | between 16 AWG (1.31 mm²) and 15 AWG (1.65 mm²) |
| 2.5 mm² | between 14 AWG (2.08 mm²) and 13 AWG (2.62 mm²) |
| 4 mm² | between 12 AWG (3.31 mm²) and 11 AWG (4.17 mm²) |
| 6 mm² | between 10 AWG (5.26 mm²) and 9 AWG (6.63 mm²) |
| 10 mm² | between 8 AWG (8.37 mm²) and 7 AWG (10.55 mm²) |
| 16 mm² | between 6 AWG (13.30 mm²) and 5 AWG (16.77 mm²) |
| 25 mm² | between 4 AWG (21.15 mm²) and 3 AWG (26.67 mm²) |
| 35 mm² | between 2 AWG (33.62 mm²) and 1 AWG (42.41 mm²) |
1.5 mm²
between 16 AWG (1.31 mm²) and 15 AWG (1.65 mm²)
2.5 mm²
between 14 AWG (2.08 mm²) and 13 AWG (2.62 mm²)
4 mm²
between 12 AWG (3.31 mm²) and 11 AWG (4.17 mm²)
6 mm²
between 10 AWG (5.26 mm²) and 9 AWG (6.63 mm²)
10 mm²
between 8 AWG (8.37 mm²) and 7 AWG (10.55 mm²)
16 mm²
between 6 AWG (13.30 mm²) and 5 AWG (16.77 mm²)
25 mm²
between 4 AWG (21.15 mm²) and 3 AWG (26.67 mm²)
35 mm²
between 2 AWG (33.62 mm²) and 1 AWG (42.41 mm²)
A metric size may sit numerically between two AWG nominal areas. Selecting a metric product is therefore a specification decision, not simply a mathematical rounding exercise. Review the 1.5, 2.5, 4, 6 and 10 mm² building-wire sizes before preparing the metric portion of an RFQ.
16, 14, 12, 10 and 8 AWG: Quick Buyer Reference
16 AWG
Nominal area reference: 1.31 mm²A 1.5 mm² metric product has a larger nominal conductor area, but product equivalence still depends on the required specification.
14 AWG
Nominal area reference: 2.08 mm²2.5 mm² is a nearby common metric nominal size, not an exact mathematical equivalent.
12 AWG
Nominal area reference: 3.31 mm²It falls between common 2.5 mm² and 4 mm² metric conductor sizes.
10 AWG
Nominal area reference: 5.26 mm²It falls between common 4 mm² and 6 mm² metric conductor sizes.
8 AWG
Nominal area reference: 8.37 mm²It falls between common 6 mm² and 10 mm² metric conductor sizes.
Same mm² Size Can Still Mean Different Building-Wire Construction
2.5 mm²
1 × 1.78 mm2.5 mm²
7 × 0.68 mm2.5 mm²
19 × 0.41 mmAll three references sit in the same nominal 2.5 mm² conductor-area category, but their strand construction is different. This is why AWG-to-mm² area comparison cannot replace conductor-construction review. See the BV vs BVR building wire comparison for the full construction distinction.
Can AWG and mm² Be Compared by Current Capacity?
Not by size conversion alone.
Current-carrying capacity depends on the applicable cable standard and installation conditions. Nominal conductor area is important, but a project review may also need to consider:
- Conductor material
- Conductor construction
- Insulation system and temperature rating
- Installation method
- Conduit or enclosure conditions
- Grouping with other circuits
- Ambient conditions
- Local electrical code
- Project design requirements
How to Send an AWG Building-Wire Requirement to a Metric Supplier
If your RFQ is written in AWG, keep the original designation and required standard. Huanyu can review whether an available metric building-wire construction is technically suitable for the project.
Original wire designation
Keep the original AWG size or full product designation.
Required standard and edition
Provide the exact project, national or international standard where specified.
Conductor construction
Solid, rigid stranded, flexible stranded or specified conductor class.
Conductor material
Copper or other specified conductor material.
Rated voltage
Provide the required voltage designation.
Insulation requirement
Material, temperature requirement and any other specified performance requirement.
Installation / application
Conduit, fixed building wiring, panel wiring or other approved installation condition.
Quantity
Total metres / feet by size and colour.
Colour schedule
Required colour and quantity by colour.
Coil / reel length
Required packing length.
Marking
Wire printing and label requirements.
Tests / documentation
Datasheet, test report, inspection and certification requirements.
Destination
Country, port or delivery location.
Huanyu Building Wire References
BV
Huanyu's BV range includes commonly requested metric building-wire sizes. Final conductor construction and the applicable specification are confirmed against the RFQ.
View BV Building WireBVR
Huanyu publishes BVR technical reference data for 2.5–70 mm². Final project suitability remains subject to the requested standard and construction.
View BVR Flexible Building WireBuilding Wire family
Explore Huanyu's BV, BVR and BVVB building-wire range before sending your project specification.
Explore Building WiresRead the BV vs BVR Building Wire Buyer Guide
Read the Building Wire Size Guide
Frequently Asked Questions
How many mm² is 16 AWG?
The nominal conductor-area reference for 16 AWG is approximately 1.31 mm². A 1.5 mm² metric wire is a different nominal size and should not be described as mathematically identical.
How many mm² is 14 AWG?
The nominal conductor-area reference for 14 AWG is approximately 2.08 mm². Some commercial cross-reference charts pair 14 AWG with 2.5 mm², but that is not an exact area equality.
How many mm² is 12 AWG?
The nominal conductor-area reference for 12 AWG is approximately 3.31 mm². It sits between common 2.5 mm² and 4 mm² metric sizes.
How many mm² is 10 AWG?
The nominal conductor-area reference for 10 AWG is approximately 5.26 mm². It sits between common 4 mm² and 6 mm² metric sizes.
How many mm² is 8 AWG?
The nominal conductor-area reference for 8 AWG is approximately 8.37 mm². It sits between common 6 mm² and 10 mm² metric sizes.
Is 2.5 mm² the same as 14 AWG?
No. 14 AWG is approximately 2.08 mm² in nominal conductor area. A 2.5 mm² metric product is a different nominal conductor size.
Is 4 mm² the same as 12 AWG?
No. 12 AWG is approximately 3.31 mm². A 4 mm² product may have a larger nominal conductor area, but that does not prove product equivalence.
Can I convert an AWG purchase specification directly to mm²?
Use the area comparison only as an initial reference. Keep the original wire specification and confirm the applicable standard, conductor construction, insulation, voltage rating, resistance limits, dimensions, tests and documentation before changing the designation.
Have an AWG Building-Wire Specification or BOQ?
Send the original AWG designation, required standard, conductor construction, voltage rating, colour, packing, quantity and destination. Huanyu Cable can review whether an available metric building-wire construction fits the requested technical and documentation requirements before quotation.
Send Your Building Wire Specification