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

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Square Millimeter [mm²]


A square millimeter (mm²) is a unit of area equal to a square with sides 1 millimeter long. It is used to measure very small surfaces, such as parts of mechanical components or electronic circuits.

1 mm² = 0.000001 m².


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.



  • Formula: Area = π × (radius)²



  • 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.



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Convert square millimeter [mm^2] to Other Area Units

🔄 square millimeter [mm^2] to square meter [m^2]
🔄 square millimeter [mm^2] to square kilometer [km^2]
🔄 square millimeter [mm^2] to square centimeter [cm^2]
🔄 square millimeter [mm^2] to square micrometer [µm^2]
🔄 square millimeter [mm^2] to hectare [ha]
🔄 square millimeter [mm^2] to acre [ac]
🔄 square millimeter [mm^2] to square mile [mi^2]
🔄 square millimeter [mm^2] to square yard [yd^2]
🔄 square millimeter [mm^2] to square foot [ft^2]
🔄 square millimeter [mm^2] to square inch [in^2]
🔄 square millimeter [mm^2] to square hectometer [hm^2]
🔄 square millimeter [mm^2] to square dekameter [dam^2]
🔄 square millimeter [mm^2] to square decimeter [dm^2]
🔄 square millimeter [mm^2] to square nanometer [nm^2]
🔄 square millimeter [mm^2] to are [a]
🔄 square millimeter [mm^2] to barn [b]
🔄 square millimeter [mm^2] to square mile (US survey)
🔄 square millimeter [mm^2] to square foot (US survey)
🔄 square millimeter [mm^2] to circular inch
🔄 square millimeter [mm^2] to township
🔄 square millimeter [mm^2] to section
🔄 square millimeter [mm^2] to acre (US survey) [ac]
🔄 square millimeter [mm^2] to rood
🔄 square millimeter [mm^2] to square chain [ch^2]
🔄 square millimeter [mm^2] to square rod
🔄 square millimeter [mm^2] to square rod (US survey)
🔄 square millimeter [mm^2] to square perch
🔄 square millimeter [mm^2] to square pole
🔄 square millimeter [mm^2] to square mil [mil^2]
🔄 square millimeter [mm^2] to circular mil
🔄 square millimeter [mm^2] to homestead
🔄 square millimeter [mm^2] to sabin
🔄 square millimeter [mm^2] to arpent
🔄 square millimeter [mm^2] to cuerda
🔄 square millimeter [mm^2] to plaza
🔄 square millimeter [mm^2] to varas castellanas cuad
🔄 square millimeter [mm^2] to varas conuqueras cuad
🔄 square millimeter [mm^2] to Electron cross section
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