Metric Conversion Table

Read from left to right – pick your fraction , decimal or mm measurement.

Example: convert 1/64″ to mm. Find 1/64 and read to the right under mm. You will see 0.397 under the mm column.

Fraction Inches mm
-
- 0.0010 0.025
- 0.0039 0.100
- 0.0100 0.254
1/64 0.0156 0.397
- 0.0197 0.500
1/32 0.0313 0.794
- 0.0394 1.000
3/64 0.0469 1.191
1/16 0.0625 1.588
5/64 0.0781 1.984
- 0.0787 2.000
3/32 0.0938 2.381
- 0.1000 2.540
7/64 0.1094 2.778
- 0.1181 3.000
1/8 0.1250 3.175
9/64 0.1406 3.572
5/32 0.1563 3.969
- 0.1575 4.000
11/64 0.1719 4.366
3/16 0.1875 4.763
- 0.1969 5.0000
13/64 0.2031 5.159
7/32 0.2188 5.556
15/64 0.2344 5.953
- 0.2362 6.000
1/4 0.2500 6.350
17/64 0.2656 6.747
- 0.2756 7.000
9/32 0.2813 7.144
19/64 0.2969 7.541
5/16 0.3125 7.938
- 0.3150 8.000
Fraction Inches mm
21/64 0.3281 8.334
11/32 0.3438 8.731
- 0.3543 9.000
23/64 0.3594 9.128
3/8 0.3750 9.525
25/64 0.3906 9.922
- 0.3937 10.000
13/32 0.4063 10.319
27/64 0.4219 10.716
- 0.4331 11.000
7/16 0.4375 11.113
29/64 0.4531 11.509
15/32 0.4688 11.906
- 0.4724 12.000
31/64 0.4844 12.303
1/2 0.5000 12.700
- 0.5118 13.000
33/64 0.5156 13.097
17/32 0.5313 13.494
35/64 0.5469 13.891
- 0.5512 14.000
9/16 0.5625 14.288
37/64 0.5781 14.684
- 0.5906 15.000
19/32 0.5938 15.081
- 0.6000 15.240
39/64 0.6094 15.478
5/8 0.6250 15.875
- 0.6299 16.000
41/64 0.6406 16.272
21/32 0.6563 16.669
- 0.6693 17.000
43/64 0.6719 17.066
11/16 0.6875 17.463
Fraction Inches mm
- 0.7000 17.780
45/64 0.7031 17.859
- 0.7087 18.000
23/32 0.7188 18.258
47/64 0.7344 18.653
- 0.7480 19.000
3/4 0.7500 19.050
49/64 0.7656 19.447
25/32 0.7813 19.844
- 0.7874 20.000
51/64 0.7969 20.241
- 0.8000 20.320
13/16 0.8125 20.638
- 0.8268 21.000
53/64 0.8281 21.034
27/32 0.8438 21.431
55/64 0.8594 21.828
- 0.8661 22.000
7/8 0.8750 22.225
57/64 0.8906 22.622
- 0.9000 22.860
- 0.9055 23.000
29/32 0.9063 22.019
59/64 0.9219 23.416
15/16 0.9375 23.813
- 0.9449 24.000
61/64 0.9531 24.209
31/32 0.9688 24.606
- 0.9843 25.000
63/64 0.9844 25.003
1 1.000 25.40