Wire Sizes

HOW TO COMPUTE CIRCULAR MIL AREA OF (CMA)
OF VARIOUS SHAPES OF WIRE

Dia.

Round Solid Wire AWG

x

Dia.

Multiply the diameter in Mils by itself. CMA = D2

D x D = CMA
D

Multiply the diameter of one strand
(in mils) by itself, and then multiply the result by the total number of strands.

Stranded Wire AWG
D

D x D x Number of Strands = CMA

WIRE SIZES
STRANDS

STRANDS
WIRE
SIZE
AWG.

NUMBER

DIA.

AREA
CIRC.
MILLS

#26
#26
#26

1
8
10

.0159
.0056
.005

254
252
250

.016
.018
.018

#25
#25
#25

1
10
8

.0179
.0056
.0063

320
315
318

.018
.020
.021

#24
#24
#24
#24

1
8
10
7

.0201
.0071
.0063
.008

404
398
398
448

.020