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Wire Gauge Calculator

Precision conversion tool for AWG, metric and circular mil measurements with real-time calculations.

AWG
CMIL
mm²
mm Ø
in²
in Ø

Wire Gauge Calculations Formula

dₙ (in) = 0.005 in × 92^((36 - n)/39)
The n gauge wire diameter dₙ in inches (in) is equal to 0.005 in times 92 raised to the power of (36 minus gauge number n), divided by 39.
dₙ (mm) = 0.127 mm × 92^((36 - n)/39)
The n gauge wire diameter dₙ in millimeters (mm) is equal to 0.127 mm times 92 raised to the power of (36 minus gauge number n), divided by 39.

Wire Cross Sectional Area Calculations

Aₙ (kcmil) = 1000 × dₙ² = 0.025 in² × 92^((36 - n)/19.5)
The n gauge wire's cross-sectional area Aₙ in kilo-circular mils (kcmil) is equal to 1000 times the square of the wire diameter dₙ in inches (in).
Aₙ (in²) = (π/4) × dₙ² = 0.000019635 in² × 92^((36 - n)/19.5)
The n gauge wire's cross-sectional area Aₙ in square inches (in²) is equal to π divided by 4 times the square of the wire diameter dₙ in inches (in).
Aₙ (mm²) = (π/4) × dₙ² = 0.012668 mm² × 92^((36 - n)/19.5)
The n gauge wire's cross-sectional area Aₙ in square millimeters (mm²) is equal to π divided by 4 times the square of the wire diameter dₙ in millimeters (mm).
Wire Gauge Calculator

Wire Gauge Calculator – Convert AWG, mm², CMIL, and More

This Wire Gauge Calculator is a powerful and easy-to-use tool designed for electrical engineers, technicians, and DIYers. Instantly convert between American Wire Gauge (AWG), millimeter diameter (mm), square millimeter area (mm²), circular mil area (CMIL), inch diameter, and square inch area with a single input. Whether you're starting with AWG, CMIL, or diameter in mm, the tool auto-calculates all corresponding values based on standard solid wire data.

The AWG system—originally known as the Brown & Sharpe gauge—has been widely adopted in North America and beyond. Its logarithmic scale means lower gauge numbers correspond to thicker wires. For example, a 10 AWG wire has roughly 10 times the cross-sectional area of a 20 AWG wire.

This calculator simplifies wire sizing conversions for design, troubleshooting, and product selection—no lookup tables or manual math required.

AWG
(American Wire Gauge)		 Area
mm²		 Area
in²		 CMA Diameter
mmØ		 Diameter
inØ		 AWG
(American Wire Gauge)		 Area
mm²		 Area
in²		 CMA Diameter
mmØ		 Diameter
inØ
0000 (4/0) 107.2193 0.16619 211600 11.684 0.46 19 0.6527 0.00101 1288 0.9116 0.0359
000 (3/0) 85.0288 0.13179 167806 10.4049 0.4096 20 0.5176 0.0008 1022 0.8118 0.032
00 (2/0) 67.4309 0.10452 133077 9.2658 0.3648 21 0.4105 0.00064 810 0.7229 0.0285
0 (1/0) 53.4751 0.08289 105534 8.2515 0.3249 22 0.3255 0.0005 642 0.6438 0.0253
1 42.4077 0.06573 83693 7.3481 0.2893 23 0.2582 0.0004 509 0.5733 0.0226
2 33.6308 0.05213 66371 6.5437 0.2576 24 0.2047 0.00032 404 0.5105 0.0201
3 26.6705 0.04133 52635 5.8273 0.2294 25 0.1624 0.00025 320 0.4547 0.0179
4 21.1506 0.03278 41741 5.1894 0.2043 26 0.1288 0.0002 254 0.4049 0.0159
5 16.7732 0.026 33102 4.6213 0.1819 27 0.1021 0.00016 201 0.3606 0.0142
6 13.3018 0.02062 26251 4.1154 0.162 28 0.081 0.00013 160 0.3211 0.0126
7 10.5488 0.01635 20818 3.6649 0.1443 29 0.0642 0.0001 127 0.2859 0.0113
8 8.3656 0.01297 16510 3.2636 0.1285 30 0.0509 0.00008 101 0.2546 0.01
9 6.6342 0.01028 13093 2.9058 0.1144 31 0.0404 0.00006 80 0.2268 0.0089
10 5.2615 0.00814 10383 2.5883 0.1019 32 0.032 0.00005 63 0.2019 0.0079
11 4.1723 0.00647 8234 2.3048 0.0907 33 0.0254 0.00004 50 0.1798 0.0071
12 3.3088 0.00513 6530 2.0525 0.0808 34 0.0201 0.00003 40 0.1601 0.0063
13 2.624 0.00406 5178 1.8278 0.0719 35 0.016 0.00002 32 0.1426 0.0056
14 2.0809 0.00323 4107 1.6277 0.0641 36 0.0127 0.00001 25 0.127 0.005
15 1.6502 0.00256 3257 1.4495 0.0571 37 0.01 0.00001 20 0.113 0.0044
16 1.3087 0.00203 2583 1.2908 0.0508 38 0.0079 0.00001 16 0.1007 0.004
17 1.0378 0.00161 2048 1.1495 0.0453 39 0.0063 0.00001 12 0.0897 0.0035
18 0.823 0.00128 1624 1.0237 0.0403 40 0.005 0.00001 10 0.0799 0.0031

FAQ

What is 10 AWG in mm²?

10 AWG (American Wire Gauge) is approximately 5.26 mm² in cross-sectional area. This conversion helps when comparing with metric wires or complying with international standards.

How do you convert AWG to mm²?

To convert AWG to mm², first calculate the diameter in millimeters using the AWG formula, then use the circular area formula:

A = (π/4) × d²

Or use a trusted wire gauge calculator to get accurate results instantly.

What does AWG stand for in wire size?

AWG stands for American Wire Gauge, a standardized system for measuring wire diameter and cross-sectional area in the U.S. The smaller the gauge number, the thicker the wire.

What is the difference between AWG and SWG?

AWG (American Wire Gauge) is used primarily in North America, while SWG (Standard Wire Gauge) is a British standard. The two systems use different measurement scales and aren't directly interchangeable.

Can I use metric wires instead of AWG?

Yes, but you need to match the cross-sectional area and current-carrying capacity. For example, 2.5 mm² wire is roughly equivalent to 14 AWG. Always check local codes and specifications.

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