🧰 Wire Size Calculator (AWG) – Diameter, Area & Circular Mils

Easily find the diameter, cross-sectional area, and circular mils of any American Wire Gauge (AWG) size using this intuitive Wire Size Calculator. Whether you are working on electrical wiring projects, designing PCB traces, or selecting the right wire for heavy industrial use, this tool gives you all the critical parameters at your fingertips.

---

📏 How the Calculator Works:

Simply select an AWG size from the dropdown list (ranging from 4/0 to 40 AWG), and the calculator will automatically display:

• Diameter in millimeters (mm) and inches (in)
• Cross-sectional Area in square millimeters (mm²), square inches (in²)
• Area in Circular Mils (CM)

A dynamic gauge visualization also shows a scaled graphical comparison of different wire sizes, helping you understand size differences visually.

---

⚙️ Key Features:

• 🔹 Covers full AWG range: From largest (4/0) to smallest (40 AWG).
• 🔹 Instant unit conversion: mm, inches, mm², in², and circular mils displayed simultaneously.
• 🔹 Interactive gauge visual: Wire sizes are graphically represented, with your selected size highlighted.
• 🔹 Responsive design: Works perfectly on desktop, tablet, and mobile (portrait and landscape).
• 🔹 Accurate calculations: Based on standard AWG mathematical formulas.

---

🔢 Technical Formulas Used:

The wire diameter ddd in millimeters is calculated from the AWG size nnn using the standard formula: d=0.127×92^((36−n)/39) (in mm)

Where:

• 0.127 mm is the diameter of 36 AWG wire
• The factor 92 is the geometric ratio between each gauge step

From the diameter:

• Cross-sectional area = π×(d/2)^2
• Circular Mils (CM) = (d in inches×1000)^2

---

🧩 Why Wire Size Matters:

Selecting the correct wire size is critical because:

• Undersized wires can overheat and cause fires or equipment damage.
• Oversized wires increase cost and installation difficulty without practical benefits.
• Proper sizing ensures safe current carrying capacity, voltage drop minimization, and reliable performance in electrical and electronic systems.