How do I convert AWG to diameter in millimeters?

Enter the AWG number into a converter that uses the standard formula d = 0.127 × 92^((36-AWG)/39). The result is the nominal diameter in millimeters; for example, 14 AWG is about 1.63 mm.

What is the diameter of 12 AWG wire in inches?

12 AWG wire has a nominal diameter of approximately 0.0808 inches. Check the tool’s size chart for the exact value, as actual stranded wire may vary slightly.

Does AWG diameter increase or decrease as the gauge number gets higher?

Higher AWG numbers mean thinner wire. The diameter decreases as the gauge number increases, following an exponential scale where each 6-gauge step roughly doubles or halves the diameter.

Can I convert diameter back to AWG?

Yes—most of these tools support bidirectional conversion. Enter the diameter in inches or millimeters and the calculator will return the closest AWG size. The formula used is AWG = -39 × log_92(d/0.127) + 36.

What’s the difference between AWG and metric wire sizing?

AWG is a logarithmic gauge system used mainly in North America, where larger numbers indicate thinner wire. Metric sizing typically uses cross-sectional area in square millimeters (mm²), and the relationship to diameter is direct: diameter = 2 × √(area ÷ π). The two systems are not directly interchangeable without conversion formulas.

Electrical6 options compared

Awg to Diameter Electrical Converter

Converts American Wire Gauge (AWG) measurements into corresponding wire diameters in both inches and millimeters. This electrical calculator provides comprehensive conversions beyond simple dimension changes, offering calculated cross-sectional area and resistance values based on the input gauge. The tool includes explanatory information detailing AWG formulas and providing established reference...

Editors’ Top PickBased on community votes

Number Convert

numberconvert.com

Convert electrical units instantly with this free awg to diameter converter. Includes reference tables, practical app...

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Other OptionsRanked by votes

02
02
The Eraser Company
eraser.com
Its Wire Calculator supports direct conversion between AWG and nominal conductor diameter in both inches and millimet...
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03
03
Inch Calculator
inchcalculator.com
Its Wire Size Calculator includes a mode to calculate wire diameter from AWG and the reverse gauge lookup from dimens...
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04
04
RapidTables
rapidtables.com
The Wire Gauge Calculator converts AWG to wire diameter in inches and millimeters and shows related area/resistance v...
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05
05
Omni Calculator
omnicalculator.com
Its Wire Gauge Calculator includes AWG-based diameter conversion in both inches and millimeters, plus cross-sectional...
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06
06
Engineering ToolBox
engineeringtoolbox.com
This AWG page provides a free AWG-to-diameter conversion reference with diameters in inches and millimeters and cross...
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Side by side

Awg to Diameter Electrical Converter options compared

Tool	Best for	Strengths	Limitations
RapidTables rapidtables.com	Quick AWG to diameter conversion	Instant diameter in inches and mm Shows cross-sectional area and resistance Includes standard formulas and full size chart	Ads on the page Fewer unit options compared to some tools
Inch Calculator inchcalculator.com	Detailed wire sizing with material options	Calculates diameter, area, and resistance Supports copper, aluminum, and other materials Includes formula documentation and reference chart	More fields to fill out for full results Interface is cluttered with many wire size presets
The Eraser Company eraser.com	Bidirectional AWG/diameter workflows	Supports multiple gauge systems (AWG, British SWG) Includes printable conversion chart Simple select-and-convert interface	Fewer calculation details (area/resistance) shown Site is primarily a catalog, not a dedicated calculator
Number Convert numberconvert.com	Bidirectional conversion with reference tables	Free instant conversion Includes reference tables and practical applications Bidirectional conversion support	Advertisement on the page Limited additional calculation details
Omni Calculator omnicalculator.com	Verification and educational use	Explains AWG formulas and provides reference values Supports diameter, area, and resistance outputs Clean interface for quick checks	Primarily designed as a physics calculator, not a dedicated wire sizing tool May include extra fields irrelevant to simple diameter conversion
Engineering ToolBox engineeringtoolbox.com	Standards-oriented lookup reference

Buyer's guide

How to choose a awg to diameter electrical converter

When picking an AWG-to-diameter converter, first decide whether you need only the physical diameter or also cross-sectional area and resistance values. If you just need the diameter in inches or millimeters, a simple bidirectional converter like RapidTables or Number Convert will be fastest. If you are sizing a circuit or verifying wire capacity, choose a tool that reports area and resistance alongside the diameter, and supports your conductor material (copper vs aluminum). Also consider whether you prefer an interactive calculator with formula documentation (Inch Calculator, Omni Calculator) or a static reference table (Engineering ToolBox) that you can browse quickly without entering values.

Questions

Awg to Diameter Electrical Converter FAQ

How do I convert AWG to diameter in millimeters?: Enter the AWG number into a converter that uses the standard formula d = 0.127 × 92^((36-AWG)/39). The result is the nominal diameter in millimeters; for example, 14 AWG is about 1.63 mm.
What is the diameter of 12 AWG wire in inches?: 12 AWG wire has a nominal diameter of approximately 0.0808 inches. Check the tool’s size chart for the exact value, as actual stranded wire may vary slightly.
Does AWG diameter increase or decrease as the gauge number gets higher?: Higher AWG numbers mean thinner wire. The diameter decreases as the gauge number increases, following an exponential scale where each 6-gauge step roughly doubles or halves the diameter.
Can I convert diameter back to AWG?: Yes—most of these tools support bidirectional conversion. Enter the diameter in inches or millimeters and the calculator will return the closest AWG size. The formula used is AWG = -39 × log_92(d/0.127) + 36.
What’s the difference between AWG and metric wire sizing?: AWG is a logarithmic gauge system used mainly in North America, where larger numbers indicate thinner wire. Metric sizing typically uses cross-sectional area in square millimeters (mm²), and the relationship to diameter is direct: diameter = 2 × √(area ÷ π). The two systems are not directly interchangeable without conversion formulas.

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