Fraction and Metric Conversion Chart

Print this chart out, and hang it up in your shop and you’ll be surprised at how many times you take a look at it!

View the printable/PDF version

Otherwise, the online version of the chart is listed below. You may have noticed that nearly all measurements and values listed in the Wood Database are in both imperial and metric format. This isn’t because I’m a huge fan of the metric system, but because I know how irritating it can be to look at something that should make sense to me, but I can’t fully understand what I’m looking at because the distances are listed in metric units. So, in the spirit of cooperation and understanding, I whipped up a quick little metric conversion chart to be used around the shop. It’s useful for drilling holes and other small measurements in millimeters.

Metric to Imperial Conversions
			Fractional Equivalents:
Millimeters	Inches			Decimal	MM
1	.039		1/16″	.0625	1.59
2	.079
3	.118		1/8″	.125	3.18
4	.157
5	.197		3/16″	.1875	4.76
6	.236		1/4″	.250	6.35
7	.276
8	.315		5/16″	.3125	7.94
9	.354
10	.394		3/8″	.375	9.53
11	.433		7/16″	.4375	11.11
12	.472
13	.512		1/2″	.500	12.70
14	.551		9/16″	.5625	14.29
15	.591
16	.630		5/8″	.625	15.88
17	.669		11/16″	.6875	17.46
18	.709
19	.748		3/4″	.750	19.05
20	.787
21	.827		13/16″	.8125	20.64
22	.866		7/8″	.875	22.23
23	.906
24	.945		15/16″	.9375	23.81
25	.984		1″	1.00	25.40
26	1.024
27	1.063
28	1.102		1 1/8″	1.13	28.70
29	1.142
30	1.181		1 1/4″	1.25	31.75
35	1.378		1 3/8″	1.375	34.93
40	1.575		1 1/2″	1.50	38.10
45	1.772		1 3/4″	1.75	44.45
50	1.969		2″	2.00	50.80
55	2.165
60	2.362
65	2.559		2 1/2″	2.50	63.50
70	2.756
75	2.953
80	3.150		3″	3.00	76.20
85	3.346
90	3.543		3 1/2″	3.50	88.90
95	3.740
100	3.937		4″	4.00	101.60