Length converter

Convert Millimeters to Inches (mm to in)

1 mm = 0.03937 in. Reading metric drawings on imperial machines and gauging stock.

Millimeters to inches conversion table

mm	in
0.5 mm	0.019685 in
1 mm	0.03937 in
2 mm	0.07874 in
3 mm	0.11811 in
4 mm	0.15748 in
5 mm	0.19685 in
6 mm	0.23622 in
8 mm	0.314961 in
10 mm	0.393701 in
12 mm	0.472441 in
15 mm	0.590551 in
16 mm	0.629921 in
20 mm	0.787402 in
25 mm	0.984252 in
30 mm	1.1811 in
40 mm	1.5748 in
50 mm	1.9685 in
60 mm	2.3622 in
75 mm	2.9528 in
100 mm	3.937 in
150 mm	5.9055 in
200 mm	7.874 in
250 mm	9.8425 in
300 mm	11.811 in
500 mm	19.685 in
1000 mm	39.3701 in

How to convert millimeters to inches

Multiply the value in millimeters by 0.03937 to get inches. 1 mm equals 0.03937 in, and 1 in equals 25.4 mm.

About these units

The millimeter is one thousandth of a meter and the default dimension unit on metric engineering drawings. Machined tolerances are commonly quoted in hundredths of a millimeter.

The inch is the base dimension unit on US engineering drawings, defined exactly as 25.4 millimeters. Shop tolerances are usually expressed in decimal inches rather than fractions.

Common questions

How many inches are in a millimeter?

1 mm equals 0.03937 in.

How do you convert millimeters to inches?

Use in = mm ÷ 25.4. So 1 mm = 0.03937 in, and to go back, 1 in = 25.4 mm.

What is 10 mm in in?

10 mm equals 0.393701 in.

What is 25 mm in in?

25 mm equals 0.984252 in.

Convert in to mm or browse all converters.

Download this conversion table as CSV.