Convert Millimeter to Inch
Live bidirectional calculator for Millimeters (mm) and Inches (in) with verified formula and conversion charts.
Length8 units
How the Calculation Works (Linear Scaling)
Since 1 Inch = 25.4 Millimeters, divide the value in Millimeters by 25.4.
Millimeter to Inch Conversion Table
Precomputed values for quick reference and printing.
| Millimeter | Inch |
|---|---|
| 1 mm | 0.0394 in |
| 2 mm | 0.0787 in |
| 3 mm | 0.1181 in |
| 4 mm | 0.1575 in |
| 5 mm | 0.1969 in |
| 6 mm | 0.2362 in |
| 7 mm | 0.2756 in |
| 8 mm | 0.315 in |
| 9 mm | 0.3543 in |
| 10 mm | 0.3937 in |
| 15 mm | 0.5906 in |
| 20 mm | 0.7874 in |
| 25 mm | 0.9843 in |
| 30 mm | 1.1811 in |
| 40 mm | 1.5748 in |
| 50 mm | 1.9685 in |
| 75 mm | 2.9528 in |
| 100 mm | 3.937 in |
| Inch | Millimeter |
|---|---|
| 1 in | 25.4 mm |
| 2 in | 50.8 mm |
| 3 in | 76.2 mm |
| 4 in | 101.6 mm |
| 5 in | 127 mm |
| 6 in | 152.4 mm |
| 7 in | 177.8 mm |
| 8 in | 203.2 mm |
| 9 in | 228.6 mm |
| 10 in | 254 mm |
| 15 in | 381 mm |
| 20 in | 508 mm |
| 25 in | 635 mm |
| 30 in | 762 mm |
| 40 in | 1016 mm |
| 50 in | 1270 mm |
| 75 in | 1905 mm |
| 100 in | 2540 mm |
About Millimeter (mm)
One thousandth of a meter (10โปยณ m).
History: Derived from the metric system established during the French Revolution. Standardized as part of the SI system.
Common Uses: Engineering tolerances, small-part manufacturing, rainfall measurement, and medical device specifications.
About Inch (in)
The inch is defined as exactly 25.4 millimeters (0.0254 meters) by international agreement since 1959.
History: Historically based on the width of a human thumb. Standardized internationally in 1959 when English-speaking nations agreed on the exact metric equivalence.
Common Uses: Screen sizes, pipe diameters, construction lumber, and everyday measurement in the US, UK, and Canada.
โ Frequently Asked Questions
How many Inches are in 1 Millimeter?
There are exactly 0.03937 Inches in 1 Millimeter (1 mm = 0.03937 in).
What is the formula to convert Millimeter to Inch?
The formula is: Inch = Millimeter / 25.4. Since 1 Inch = 25.4 Millimeters, divide the value in Millimeters by 25.4.
How do I convert 1 mm to in manually?
To convert 1 mm to in: apply the formula Inch = Millimeter / 25.4. Substituting gives: 1 / 25.4 = 0.0394 in.