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Mil Circular Mil Area

Reference data and engineering information about mil circular mil area for miscellaneous applications.

milcircularmilarea

Overview

Engineering reference data for Mil Circular Mil Area in miscellaneous.

Key Formulas

Unit Conversion

y=x⋅ky = x \cdot k

Multiply by conversion factor.

Linear Interpolation

y=y1+(x−x1)(y2−y1)x2−x1y = y_1 + \frac{(x - x_1)(y_2 - y_1)}{x_2 - x_1}

Estimate between two known points.

Percentage

p=partwhole×100%p = \frac{\text{part}}{\text{whole}} \times 100\%

Part as fraction of whole.

Variables

SymbolDescriptionUnit
xxInput value—
yyOutput value—
kkConversion factor—

Unit Conversions

The square mil is the area of a square whose sides are one mil (1 × 10⁻³ inch):

One Square Mil=(1×10−3)2=1×10−6 in2\text{One Square Mil} = (1 \times 10^{-3})^2 = 1 \times 10^{-6} \text{ in}^2

Conversion Factors

Imperial Conversions:

FromToFactor
1 circular milsquare inches0.7854×10−60.7854 \times 10^{-6}
1 circular milsquare mils0.78540.7854
1 square milcircular mils1.271.27

Metric Conversions:

FromToFactor
1 circular milm²5.066×10−105.066 \times 10^{-10}
1 circular milcm²5.066×10−65.066 \times 10^{-6}
1 m²circular mils1.974×1091.974 \times 10^{9}
1 cm²circular mils1.974×1051.974 \times 10^{5}

Key Relationship

The circular mil area is derived from the square of the diameter in mils, which simplifies calculations for round conductors by eliminating the need for π/4 in the area formula:

ACM=dmils2A_{\text{CM}} = d_{\text{mils}}^2

This contrasts with standard circular area calculations where A=π4d2A = \frac{\pi}{4} d^2. The circular mil system inherently accounts for the circular geometry through the conversion factor (0.7854 ≈ π/4) when converting to square units.

References

Source: engineeringtoolbox.com