Millimeters to Inches Converter

Instant mm to in conversion. Enter a number and get the answer right away.

From mm in To
mm
in

How to Convert mm to in

1 mm equals 0.03937 in. To convert mm to in, multiply by 0.03937 (in = mm / 25.4). For example, 10 mm is 0.3937 in. The calculator above applies the same conversion in both directions, so you can also type a value in in to get mm.

in = mm / 25.4

One mm equals 0.03937 in. Use the formula below for any number.

mm to in Conversion Table

mm in
1 mm 0.03937 in
2 mm 0.07874 in
3 mm 0.11811 in
5 mm 0.19685 in
10 mm 0.393701 in
15 mm 0.590551 in
20 mm 0.787402 in
25 mm 0.984252 in
50 mm 1.968504 in
75 mm 2.952756 in
100 mm 3.937008 in
150 mm 5.905512 in
200 mm 7.874016 in
500 mm 19.685039 in
1000 mm 39.370079 in

Common mm to in Conversions

1 mm
= 0.03937 in
5 mm
= 0.19685 in
10 mm
= 0.393701 in
25 mm
= 0.984252 in
50 mm
= 1.968504 in
100 mm
= 3.937008 in
500 mm
= 19.685039 in
1000 mm
= 39.370079 in

When You Need This Conversion

Useful for road signs, running distances, travel planning, and reading height and room measurements.

Units and Conventions

This page uses the international mile: 1 statute mile = 1,609.344 m exactly. A nautical mile is 1,852 m, and 1 inch is exactly 2.54 cm. US survey feet and survey miles differ slightly from international feet and miles.

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Frequently Asked Questions

How many in are in 1 mm?

1 mm equals 0.03937 in. The formula is in = mm / 25.4.

What is the mm to in formula?

Use in = mm / 25.4. The calculator above applies it instantly and also works in reverse.

Can I convert in back to mm?

Yes. Type a value into the second field and the calculator converts in the opposite direction.

Is this converter free and accurate?

Yes. It runs in your browser with no signup. Results come from the exact conversion factor shown on this page and are rounded to 6 decimal places.

Which standard does this page use?

See the Units and Conventions section above - it lists the exact definition used here and the alternatives common in other countries.

Does it work on my phone?

Yes. The calculator is designed for phones first, with large inputs and instant results as you type.