Conversion Tables and Charts

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Conversion Tables and Charts



Division E - General Information


Conversion Tables and Charts

Roofing Slopes

Fall/Run
Slope Ratio Inch / Foot mm / m Percentage Slope Angle
Degrees / Minutes
1:1 12" in 12" 1000.0 100.0 45 - 00
1:2 6" in 12" 500.0 50.0 26 - 34
1:3 4" in 12" 333.3 33.3 18 - 26
1:4 3" in 12" 250.0 25.0 14 - 02
1:5 -- 200.0 20.0 11 - 19
1:6 2" in 12" 166.7 16.7 9 - 28
1:7 -- 142.9 14.29 8 - 08
1:8 1-1/2" in 12" 125.0 12.5 7 - 08
1:9 -- 111.1 11.1 6 - 20
1:10 1-1/2" in 12"* 100.0 10.0 5 - 43
1:11 -- 90.9 9.09 5 - 12
1:12 1" in 12" 83.0 8.3 4 - 46
1:13 -- 76.9 7.69 4 - 24
1:14 -- 71.4 7.14 4 - 05
1:15 3/4" in 12"* 67.0 6.7 3 - 49
1:20 5/8" in 12"* 50.0 5.0 2 - 52
1:25 1/2" in 12"* 40.0 4.0 2 - 17
1:30 -- 33.3 3.33 1 - 55
1:40 -- 25.0 2.5 1 - 26
1:50 1/4" in 12"* 20.0 2.0 1 - 09
1:60 -- 16.7 1.67 0 - 57
1:80 -- 12.5 1.25 0 - 43
1:100 1/8" in 12"* 10.0 1.0 0 - 34
* (Nominal)

Imperial/Metric Conversions

Commonly used length measurements
Imperial (inches) Metric (mm)
1/16 1.59
3/32 2.38
1/8 3.78
3/16 4.76
1/4 6.35
3/8 9.53
1/2 12.70
5/8 15.88
3/4 19.05
7/8 22.23
1 25.40
1-1/2 38.10
2 50.80
2-1/2 63.50
3 76.20
3-1/2 88.9
4 101.60
5 127.00
6 152.40
7 177.80
8 203.20
9 228.60
10 254.00
12 304.80
16 406.40
24 609.60
36 914.40
48 1219.20
60 1524.00
72 1828.80
96 2438.40
120 3048.00

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