Convert circular inch to square mil [mil^2] Online | Free area Converter

Circular Inch

A circular inch is a unit of area used primarily in engineering and wire gauge measurements. It represents the area of a circle with a diameter of one inch.

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  Formula: Area = π × (radius)²

  
  
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  Since the radius is half an inch,
  
  Area = π × (0.5 in)² = π × 0.25 in² ≈ 0.7854 square inches (in²).

  
  

Circular inches are often used to specify cross-sectional areas of wires or pipes.

Square Mil [mil²]

A square mil (mil²) is a very small unit of area used mainly in engineering and manufacturing, especially for measuring the cross-sectional area of wires and thin materials.

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  1 mil = 1/1000 of an inch (0.001 inch)

  
  
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  1 square mil = (0.001 inch)² = 0.000001 square inches (in²)

  
  
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  1 square mil ≈ 6.4516 × 10⁻¹⁰ square meters (m²)

  
  

Square mils are useful for precise measurements in electronics and materials science.