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

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Circular Mil


A circular mil is a unit of area used mainly to measure the cross-sectional area of round wires and cables in electrical engineering.



  • Defined as the area of a circle with a diameter of 1 mil (1 mil = 0.001 inch).



  • Area = (diameter in mils)² circular mils.



  • 1 circular mil ≈ 7.854 × 10⁻¹⁰ square meters or 0.7854 square mils.



Circular mils simplify calculations for round wires since area scales with the square of the diameter.



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.



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



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



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



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



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