RFQ List
This tool calculates nominal equivalent wire size values across multiple standards, including American Wire Gauge (AWG), square millimeter area (mm²), circular mil area (CMA), and more. Simply enter a known wire size or value, and all corresponding equivalent measurements will be calculated and displayed automatically.
Results are rounded to the nearest wire gauge
Introduction
Navigating between American Wire Gauge (AWG) and metric measurements ( or ) can be challenging. While AWG is the standard in North America, the UK and the rest of the world typically use the metric system.
Whether you are an American customer faced with metric options, or a UK customer trying to match a specific AWG requirement, this guide bridges the gap.
Use this table to find the closest standard metric cable size for your AWG requirement. Note that AWG does not convert perfectly to metric round numbers; we have recommended the closest suitable "Available Cable Size" for purchase.
| AWG # | Diameter (mm) | Area (mm²) | Recommended Metric Size |
|---|---|---|---|
| 4/0 (0000) | 11.68 | 107.22 | 120 |
| 3/0 (000) | 10.40 | 85.03 | 95 |
| 2/0 (00) | 9.27 | 67.43 | 70 |
⚠️ Safety Note: For mains voltage applications (110v, 230v, etc.), we suggest a minimum conductor size of 0.5mm² (AWG 23 and up). Smaller cables (AWG 24-40) are generally reserved for low-voltage applications such as audio, video, telephone, and data signal cabling.
The American Wire Gauge (AWG) system was developed by the Brown & Sharpe Company—a leading manufacturer of machinist technology—and was formally adopted as an industry standard in 1857.
Unlike metric sizing, where the number represents the actual size (width or area), AWG is a "retrograde" system: the higher the number, the thinner the wire.
Because AWG is based on a geometric progression rather than round metric numbers, converting it requires a specific mathematical formula.
To calculate the diameter () of an gauge wire in millimeters:
These sizes are typically used for data, signal, and winding applications.
| AWG # | Diameter (mm) | Area (mm²) |
|---|---|---|
| 23 | 0.57 | 0.26 |
| 24 | 0.51 | 0.20 |
| 25 | 0.45 | 0.16 |
| 26 | 0.40 | 0.13 |
| 27 | 0.36 | 0.10 |
| 28 | 0.32 | 0.08 |
| 29 | 0.29 | 0.06 |
| 30 | 0.25 | 0.05 |
| 32 | 0.20 | 0.03 |
| 34 | 0.16 | 0.02 |
| 36 | 0.13 | 0.01 |
| 38 | 0.10 | 0.008 |
| 40 | 0.08 | 0.005 |
| 1/0 (0) | 8.25 | 53.48 | 70 |
| 1 | 7.35 | 42.41 | 50 |
| 2 | 6.54 | 33.63 | 35 |
| 3 | 5.83 | 26.67 | 35 |
| 4 | 5.19 | 21.15 | 25 |
| 5 | 4.62 | 16.77 | 25 |
| 6 | 4.12 | 13.30 | 16 |
| 7 | 3.66 | 10.55 | 16 |
| 8 | 3.26 | 8.37 | 10 |
| 9 | 2.91 | 6.63 | 10 |
| 10 | 2.59 | 5.26 | 6 |
| 11 | 2.30 | 4.17 | 6 |
| 12 | 2.05 | 3.31 | 4 |
| 13 | 1.83 | 2.62 | 4 |
| 14 | 1.63 | 2.08 | 2.5 |
| 15 | 1.45 | 1.65 | 2.5 |
| 16 | 1.29 | 1.31 | 1.5 |
| 17 | 1.15 | 1.04 | 1.5 |
| 18 | 1.02 | 0.82 | 1 |
| 19 | 0.91 | 0.65 | 0.75 |
| 20 | 0.81 | 0.52 | 0.75 |
| 21 | 0.72 | 0.41 | 0.5 |
| 22 | 0.64 | 0.33 | 0.5 |
AWG: In the American Wire Gauge (AWG) system, wire size diameters can be calculated by applying the formula D(AWG)=. 005·92((36-AWG)/39) inch. For the 00, 000, 0000 etc.
For a 200 amp service, you will need to use a #4 AWG wire for copper conductors, or a #2 AWG for Aluminum or Copper-Clad Aluminum.
AWG or American Wire Gauge is the US standard measure for the diameter of electrical conductors.
But looking at the title of this thread, are you referring the difference between #1 AWG and 1/O AWG? There is a difference, 1/O is one wire size larger.
ICAllIn’s Resistor Color Code Calculator is an interactive tool for identifying resistor values based on 4-band, 5-band, and 6-band color codes. Simply select the colors, and the calculator will display the resistance in Ohms (Ω), tolerance, and power rating. Whether you are building a circuit, repairing electronics, or sorting resistors in your lab, this calculator provides an accurate and efficient way to decode resistor values.
ICAllIn’s Ohm’s Law Calculator helps engineers and students quickly calculate resistance, current, voltage, and power in an electrical circuit. Simply enter any two known values, and the calculator will instantly compute the remaining parameters. This fast and easy-to-use online tool illustrates the fundamental relationship between voltage, current, and resistance, making it essential for circuit design, troubleshooting, and electronics learning.
The Op Amp Voltage and Gain Calculator is an easy-to-use tool for analyzing operational amplifier circuits. It calculates the output voltage, inverting gain, and non-inverting gain based on the input parameters. Simply enter the values of V1, V2, Vp, Vn, and the resistor values R1, R2, R3, and R4, and the calculator will instantly provide accurate results. This tool is suitable for both professional engineers and beginners learning op amp circuit design.
