Millimeters to inches

Convert between metric, imperial, US customary, nautical, typographic and astronomical measures of distance.

38 units in this converter

Value

Result

Decimals Decimals, fractions such as 3/4, and scientific notation such as 1.2e3 all work.

Millimeter to Inch at a glance

21 rows

Millimeter	Inch
1 mm	0.03937007874 in
2 mm	0.07874015748 in
3 mm	0.1181102362 in
4 mm	0.157480315 in
5 mm	0.1968503937 in
6 mm	0.2362204724 in
7 mm	0.2755905512 in
8 mm	0.3149606299 in
9 mm	0.3543307087 in
10 mm	0.3937007874 in
15 mm	0.5905511811 in
20 mm	0.7874015748 in
25 mm	0.9842519685 in
30 mm	1.181102362 in
40 mm	1.57480315 in
50 mm	1.968503937 in
75 mm	2.952755906 in
100 mm	3.937007874 in
250 mm	9.842519685 in
500 mm	19.68503937 in
1,000 mm	39.37007874 in

Quick pairs

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How the millimeter to inch conversion works

The meter is the SI base unit; every other length here is defined as an exact multiple of it.

Multiply by 0.03937007874 to go from millimeter to inch:

in = mm × 0.03937007874

Going the other way, multiply by 25.4, which is the same as dividing by 0.03937007874.

Questions

How many inch are in one millimeter?

One millimeter equals 0.03937007874 inch.

Which units does this length converter cover?

38 units in total, all referenced to the meter. They include kilometer, hectometer, dekameter, meter, decimeter, centimeter and more. Pick any pair from the two dropdown lists.

How precise are the results?

Every conversion is computed in your browser at double precision from the factors listed on this page, which follow the SI definitions and the exact international agreements for imperial and US customary units. Use the Decimals control to round the display without changing the underlying value.

Does anything I type leave my device?

No. The converter is plain JavaScript running locally, with no server round-trip, and the page keeps working offline once loaded.