# Electric Wires - Cross-Section Equations

## Calculating single and bunched wire cross-sections and diameters

### Cross-Section Area of Single Wire

The cross-section area of a round single wire can be calculated as

*A = D ^{2} π / 4*

* = 0.7854 D^{2} *

*where *

*A = cross-section area (mm ^{2}, in^{2}) *

*D = diameter (mm, in)*

### Cross-Section Area of Bunched Wire

The cross-section area of bunched wires can be calculated as

*A = n d ^{2} π / 4*

* = 0.7854 n d^{2} *

*where *

*n = number of wires*

*d = single wire diameter (mm, in)*

### Diameter of a Single Wire Cross-Section Area

The diameter of a single wire cross-section area can be calculated as

*D = (A 4 / π)^{1/2} *

* = (1.2732 A)^{1/2}*

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