# 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 = D2 π / 4

= 0.7854 D2

where

A = cross-section area (mm2, in2)

D = diameter (mm, in)

### Cross-Section Area of Bunched Wire

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

A = n d2 π / 4

= 0.7854 n d2

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

## Related Topics

• Electrical - Electrical units, amps and electrical wiring, wire gauge and AWG, electrical formulas and motors

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