MM to Inches Converter
This free converter turns millimeters into inches (and inches into mm) using the exact definition 1 inch = 25.4 mm, and also shows the nearest fraction of an inch at 1/16 and 1/32 precision.
Inches
3.937 in
Nearest fraction of an inch
To the nearest 1/16
3 15/16 in
Off by 0.0125 mm
To the nearest 1/32
3 15/16 in
Off by 0.0125 mm
Common conversions
| Millimeters | Inches |
|---|---|
| 1 | 0.0394 |
| 5 | 0.1969 |
| 10 | 0.3937 |
| 25.4 | 1 |
| 50 | 1.9685 |
| 100 | 3.937 |
Examples
How to use
- 1
Type a length in millimeters (or switch the direction to start from inches).
- 2
Read the decimal result instantly: the tool divides or multiplies by exactly 25.4.
- 3
Check the nearest 1/16 and 1/32 inch fraction, with how far off it is in mm, handy for drills and wrenches.
- 4
Use the common conversions table below, or copy and download your result.
Parameters
Every field of this tool can be prefilled from the URL. Use these query parameters:
| Parameter | Type | Default |
|---|---|---|
| value | number | 25.4 |
| direction | mmToIn | inToMm | mmToIn |
Example : https://www.veltotools.com/conversion/mm-to-inches-converter?value=25.4
API
The same tool is available as a free JSON API, with the same parameters as above. No key, no sign-up.