MM to Inches Fraction Calculator

Convert metric measurements into inch fractions for rulers, shop drawings, and parts that mix metric and inch dimensions.

Use the main calculator to enter fractions, decimals, mixed inch values, or millimeters. The chart below gives quick reference values for this page.

Metric to Inch Fraction Examples

Common millimeter measurements converted to decimal inches and nearest inch fractions.

Millimeters	Decimal inches	Nearest 1/16	Nearest 1/64
0.5 mm	0.0197 in	0	1/64
1 mm	0.0394 in	1/16	3/64
1.5 mm	0.0591 in	1/16	1/16
2 mm	0.0787 in	1/16	5/64
3 mm	0.1181 in	1/8	1/8
4 mm	0.1575 in	3/16	5/32
5 mm	0.1969 in	3/16	13/64
6 mm	0.2362 in	1/4	15/64
8 mm	0.3150 in	5/16	5/16
10 mm	0.3937 in	3/8	25/64
12 mm	0.4724 in	1/2	15/32
12.7 mm	0.5000 in	1/2	1/2
15 mm	0.5906 in	9/16	19/32
16 mm	0.6299 in	5/8	5/8
19 mm	0.7480 in	3/4	3/4
20 mm	0.7874 in	13/16	25/32
25 mm	0.9843 in	1	63/64
25.4 mm	1.0000 in	1	1
30 mm	1.1811 in	19/16	19/16
38 mm	1.4961 in	3/2	3/2
50 mm	1.9685 in	31/16	63/32

Note: Values are based on 1 inch = 25.4 millimeters.