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Millimeters to inches

1 millimeter = 0.0394 inches

For any other value: in = mm × 0.0393700787

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0.0394 in

Type a number — fractions like 3/8 or 1 1/2 work too. You can leave the unit in: 100 mm is fine.

millimeters to inches, compared on the same scale 0246810 00.07870.1570.2360.3150.394 mm in
On the same scale: 2 mm is 0.0787 in, and 10 mm is 0.394 in.

Millimeters to inches chart

The values people look up most.

Millimeters to inches: the values people look up most
millimeters inches
1 mm 0.0394 in
2 mm 0.0787 in
3 mm 0.1181 in
4 mm 0.1575 in
5 mm 0.1969 in
6 mm 0.2362 in
7 mm 0.2756 in
8 mm 0.315 in
9 mm 0.3543 in
10 mm 0.3937 in
11 mm 0.4331 in
12 mm 0.4724 in
13 mm 0.5118 in
14 mm 0.5512 in
15 mm 0.5906 in
16 mm 0.6299 in
18 mm 0.7087 in
20 mm 0.7874 in
25 mm 0.9843 in
30 mm 1.1811 in
32 mm 1.2598 in
40 mm 1.5748 in
50 mm 1.9685 in
60 mm 2.3622 in
70 mm 2.7559 in
80 mm 3.1496 in
90 mm 3.5433 in
100 mm 3.937 in
150 mm 5.9055 in
200 mm 7.874 in

Formula

in = mm × 0.0393700787

In inches, fractions carry as much weight as whole numbers — 1/2, 3/8 and 1/4 are among the most looked-up sizes.

Where this number comes from

This factor is exact, not rounded. The inch is exactly 25.4 mm under the 1959 international yard and pound agreement — not a rounded figure.

Source: NIST Guide to the SI, Appendix B: Conversion Factors, NIST (National Institute of Standards and Technology, USA).

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