Formula
mm to in conversion formula
Use this relationship for a direct conversion:
in = mm x 0.03937007874
Worked example
2 mm = 0.0787401575 in.
Metric factors and international inch, foot, yard, mile, and nautical mile definitions are exact.
Length conversion
Convert Millimeter to Inch
1 millimeter (mm) equals 0.03937007874 inch (in). Enter any value below to convert from mm to in.
Enter a value and choose units. Results update instantly.
1 mm = 0.0393700787 in
All Length units
From 1 mm| Unit | Value |
|---|---|
| Meter m | 0.001 |
| Kilometer km | 0.000001 |
| Centimeter cm | 0.1 |
| Millimeter mm | 1 |
| Micrometer μm | 1,000 |
| Nanometer nm | 1,000,000 |
| Inch in | 0.0393700787 |
| Foot ft | 0.0032808399 |
| Yard yd | 0.0010936133 |
| Mile mi | 0.0000006214 |
| Nautical mile nmi | 0.00000054 |
| Light-year ly | 1.057000834e-19 |
Recent conversions
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Quick reference
Millimeter to Inch table
| Millimeter (mm) | Inch (in) |
|---|---|
| 0.01 | 0.0003937008 |
| 0.1 | 0.0039370079 |
| 1 | 0.0393700787 |
| 2 | 0.0787401575 |
| 5 | 0.1968503937 |
| 10 | 0.3937007874 |
| 25 | 0.9842519685 |
| 50 | 1.968503937 |
| 100 | 3.937007874 |
| 1,000 | 39.3700787402 |
From unit
About the millimeter
One thousandth of a meter.
Symbol: mm
To unit
About the inch
Exactly 25.4 millimeters by international agreement.
Symbol: in
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Source
Conversion standard
Definitions are checked against NIST SP 811: Guide for the Use of the SI. Calculations use full internal precision before display rounding.
View the complete length converterQuestions
mm to in FAQ
How do you convert millimeter to inch?
Use the formula in = mm x 0.03937007874. 1 millimeter (mm) equals 0.03937007874 inch (in).
Is the mm to in conversion exact?
Both unit definitions use exact factors. Only the displayed decimal may be rounded.