For all of you old buggers, here you can do conversions from imperial to metric to (inches to mm)
Imperial Fraction 3/16 is 4.68mm Metric
Conversion Formula is
25mm divided by 16 x 3 equals 4.68mm
And if a measurement has full inches before the Imperial Fraction you must add 25.54mm for each inch - 1 Inch is 25.54mm
Example
2 and 3/16 inches converts as below:
2 inches which is 51.08mm and 3/16 inches which is 4.68mm
Conversion into Metric is 55.76mm
Or use the tables below
| Fractional and Decimal Inch and Metric Conversion Tables |
Fractional Inches to Decimal Inches to
Approximate Millimeters to Practical Millimeters
Decimal inches multiplied by 25.4 = approximate mm. N.B. When specifying metric sheet or trim sizes, fractional approximate mm measurements must be rounded off to the nearest whole number; i.e., 50.8 mm is not a practical measurement; it should be rounded up to 51 mm, and 0.5 mm is always rounded down. |
| Fractional Inch |
|
Decimal
Inch |
|
Approximate Millimeters |
|
Practical Millimeters |
| 1/16 |
|
0.0625 |
|
1.5875 |
|
2 |
| 1/8 |
|
0.1250 |
|
3.1750 |
|
3 |
| 3/16 |
|
0.1875 |
|
4.7625 |
|
5 |
| 1/4 |
|
0.2500 |
|
6.3500 |
|
6 |
| 5/16 |
|
0.3125 |
|
7.9375 |
|
8 |
| 3/8 |
|
0.3750 |
|
9.5250 |
|
10 |
| 7/16 |
|
0.4375 |
|
11.1125 |
|
11 |
| 1/2 |
|
0.5000 |
|
12.7000 |
|
13 |
| 9/16 |
|
0.5625 |
|
14.2875 |
|
14 |
| 5/8 |
|
0.6250 |
|
15.8750 |
|
16 |
| 11/16 |
|
0.6875 |
|
17.4625 |
|
17 |
| 3/4 |
|
0.7500 |
|
19.0500 |
|
19 |
| 13/16 |
|
0.8125 |
|
20.6375 |
|
21 |
| 7/8 |
|
0.8750 |
|
22.2250 |
|
22 |
| 15/16 |
|
0.9375 |
|
23.8125 |
|
24 |
|
|
1.0 |
|
25.4 |
|
25 |
