Millimeter to Inch Converter
Convert Millimeter (mm) to Inch (in). Results update as you type, with a conversion table and the formula below.
1 mm =
0.03937 in
mm to in conversion table
| mm | in |
|---|---|
| 1 | 0.03937 |
| 2 | 0.07874 |
| 3 | 0.11811 |
| 4 | 0.15748 |
| 5 | 0.19685 |
| 6 | 0.23622 |
| 7 | 0.275591 |
| 8 | 0.314961 |
| 9 | 0.354331 |
| 10 | 0.393701 |
| 15 | 0.590551 |
| mm | in |
|---|---|
| 20 | 0.787402 |
| 25 | 0.984252 |
| 30 | 1.1811 |
| 40 | 1.5748 |
| 50 | 1.9685 |
| 60 | 2.3622 |
| 70 | 2.7559 |
| 80 | 3.1496 |
| 90 | 3.5433 |
| 100 | 3.937 |
How to use
- Type the mm value to convert.
- The result appears instantly in in; the swap button reverses direction.
- For common values, check the conversion table below.
Frequently asked questions
How many in is 1 mm?+
1 mm = 0.03937 in. The table below lists the values you'll reach for most often.
How accurate are the results?+
The math uses internationally standardized definitions; only the display is rounded to significant digits. Accurate enough for school, work and daily life.
How do I convert in back to mm?+
Hit the swap arrows in the middle of the converter above — the direction flips and your value is kept.
Is it really free?+
Yes. No sign-up, no install, no usage limits. The site is ad-supported.
Unit guide
The formula
1 mm equals 0.03937 in — multiply a mm value by 0.03937 to get in. Example: 5 mm × 0.03937 = 0.19685 in.
Going the other way, 1 in = 25.4 mm — multiply by 25.4, or hit the swap button on the converter above.
When is this conversion needed?
Useful whenever metric meets inches, feet and miles: overseas clothing and shoe sizes, monitor and TV specs, furniture dimensions and map distances.