Fractional Inches

In woodworking, sometimes you may need to convert between a fraction of an inch and its decimal equivalent. In my experience this has mostly been when using a digital tool like SketchUp or another modeling tool. Here’s a handy chart to convert down to thirty-seconds, along with their reduced fractions and decimal equivalents.

Thirty-secondsSixteenthsEighthsQuartersHalvesDecimals
1/32



0.0313
2/321/16


0.0625
3/32



0.0938
4/322/161/8

0.1250
5/32



0.1563
6/323/16


0.1875
7/32



0.2188
8/324/162/81/4
0.2500
9/32



0.2813
10/325/16


0.3125
11/32



0.3438
12/326/163/8

0.3750
13/32



0.4063
14/327/16


0.4375
15/32



0.4688
16/328/184/82/41/20.5000
17/32



0.5313
18/329/16


0.5625
19/32



0.5938
20/3210/165/8

0.6250
21/32



0.6563
22/3211/16


0.6875
23/32



0.7188
24/3212/166/83/4
0.7500
25/32



0.7813
26/3213/16


0.8125
27/32



0.8438
28/3214/167/8

0.8750
29/32



0.9063
30/3215/16


0.9375
31/32



0.9688