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Gauge Number

Steel Weight

in pounds per

square foot

US Standard

Gauge: thick-

ness in inches

Manufactur-

ers’ Standard:

thickness in

inches

Galvanized

Sheet: weight

in lbs/sq ft

Stainless Steel:

weight in

lbs/sq ft

7/0 20.00 0.5000 ..... .....

.....

6/0 18.75 0.4687 ..... .....

.....

5/0 17.50 0.4375 ..... .....

.....

4/0 16.25 0.4062 ..... .....

.....

3/0 15.00 0.3750 ..... .....

.....

2/0 13.75 0.3437 ..... .....

.....

0 12.50 0.3125 ..... .....

.....

1 11.25 0.2812 ..... .....

.....

2 10.62 0.2656 ..... .....

.....

3 10.00 0.2500 0.2391 .....

.....

4 9.37 0.2344 0.2242 .....

.....

5 8.75 0.2187 0.2092 .....

.....

6 8.12 0.2031 0.1943 .....

.....

7 7.50 0.1875 0.1793 .....

.....

8 6.87 0.1719 0.1644 .....

.....

9 6.25 0.1562 0.1495 .....

.....

10 5.62 0.1406 0.1345 5.7812

5.7937

11 5.00 0.1250 0.1196 5.1562

5.1500

12 4.37 0.1094 0.1046 4.5312

4.5063

13 3.75 0.0937 0.0897 3.9062

3.8625

14 3.12 0.0781 0.0747 3.2812

3.2187

15 2.81 0.0703 0.0673 2.9687

2.8968

16 2.50 0.0625 0.0598 2.6562

2.5750

17 2.25 0.0562 0.0538 2.4062

2.3175

18 2.00 0.0500 0.0478 2.1562

2.0600

19 1.75 0.0437 0.0418 1.9062

1.8025

20 1.50 0.0375 0.0359 1.6562

1.5450

21 1.37 0.0344 0.0329 1.5312

1.4160

22 1.25 0.0312 0.0299 1.4062

1.2875

23 1.12 0.0281 0.0269 1.2812

1.1587

24 1.00 0.0250 0.0239 1.1562

1.0300

25 0.875 0.0219 0.0209 1.0312

0.9013

26 0.750 0.0187 0.0179 0.9062

0.7725

27 0.687 0.0172 0.0164 0.8437

0.7081

28 0.625 0.0156 0.0149 0.7812

0.6438

29 0.562 0.0141 0.0135 0.7187

0.5794

30 0.500 0.0125 0.0120 0.6562

0.5150

31 0.437 0.0109 0.0105 .....

.....

32 0.406 0.0102 0.0097 .....

.....

33 0.375 0.0094 0.0090 .....

.....

34 0.344 0.0086 0.0082 .....

.....

35 0.312 0.0078 0.0075 .....

.....

36 0.281 0.0070 0.0067 .....

.....

37 0.266 0.0066 0.0064 .....

.....

38 0.250 0.0062 0.0060 .....

.....

39 0.234 0.0059 ..... .....

.....

40 0.219 0.0055 ..... .....

.....

Steel Sheet Gauge Chart Conduit Size vs. Wire Size

Minimum Conduit Size (inches) per Number of Type TW Wires.

Number of Wires Inside Conduit

Wire Size

AWG

2 3 4 5 6

14 1/2 1/2 1/2 1/2 1/2

12 1/2 1/2 1/2 1/2 1/2

10 1/2 1/2 1/2 1/2 3/4

8 1/2 3/4 3/4 1 1

6 3/4 1 1 1-1/4 1-1/4

4 1 1 1-1/4 1-1/4 1-1/2

2 1 1-1/4 1-1/4 1-1/2 2

1/0 1-1/4 1-1/2 2 2 2-1/2

2/0 1-1/2 1-1/2 2 2 2-1/2

3/0 1-1/2 2 2 2-1/2 2-1/2

See the National Electric Code for conduit sizes when using wire types other than

Type TW.

Designation of U.S. Pipe Sizes to the Metric System

Customary

Inches

Proposed

Millimeters

Customary

Inches

Proposed

Millimeters

1/8” 6 mm 8” 200 mm

3/16” 7 mm 10” 250 mm

1/4” 8 mm 12” 300 mm

3/8” 10 mm 14” 350 mm

1/2” 15 mm 16” 400 mm

5/8” 18 mm 18” 450 mm

3/4” 20 mm 20” 500 mm

1” 25 mm 24” 600 mm

1-1/4” 32 mm 28” 700 mm

1-1/2” 40 mm 30” 750 mm

2” 50 mm 32” 800 mm

2-1/2” 65 mm 36” 900 mm

3” 80 mm 40” 1000 mm

3-1/2” 90 mm 44” 1100 mm

4” 100 mm 48” 1200 mm

4-1/2” 115 mm 52” 1300 mm

5” 125 mm 56” 1400 mm

6” 150 mm 60” 1500 mm

Reference Information