Millimeter to Inch 转换器
Convert Millimeter (mm) to Inch (in) instantly. 1 mm = 0.03937 in.
Length转换器
31个单位可用
1 mm = 0.03937 in
公式：
in = mm × 0.0393700787With your value: 1 mm = 0.03937008 in
How big is that?
Everyday references on a logarithmic scale, all expressed in millimeter so you can sanity-check the result.
Other Millimeter to Inch conversions
Millimeter to Inch 转换表
| Millimeter (mm) | Inch (in) |
|---|---|
| 0.5 | 0.019685 |
| 1 | 0.03937 |
| 2 | 0.07874 |
| 5 | 0.19685 |
| 10 | 0.393701 |
| 15 | 0.590551 |
| 20 | 0.787402 |
| 25 | 0.984252 |
| 50 | 1.968504 |
| 100 | 3.937008 |
| 250 | 9.84252 |
| 500 | 19.685039 |
| 1000 | 39.370079 |
Inch to Millimeter 转换表
| Inch (in) | Millimeter (mm) |
|---|---|
| 0.5 | 12.7 |
| 1 | 25.4 |
| 2 | 50.8 |
| 5 | 127 |
| 10 | 254 |
| 15 | 381 |
| 20 | 508 |
| 25 | 635 |
| 50 | 1,270 |
| 100 | 2,540 |
| 250 | 6,350 |
| 500 | 12,700 |
| 1000 | 25,400 |
Where these values come from
Every factor on this page is traced to the document that defines it. See the full provenance dataset or our methodology.
Millimeter (mm)
Length
Traceable to the metre, defined by fixing the speed of light in vacuum at 299 792 458 m/s. Imperial lengths derive from the 1959 international yard (0.9144 m exactly).
Source: BIPM, The International System of Units (SI), 9th edition, 2019 (updated 2024)
Bureau International des Poids et Mesures · Reviewed 2026-07-01
Inch (in)
Length
1 inch = 25.4 mm exactly, fixed by the 1959 international yard and pound agreement.
Source: International Yard and Pound Agreement of 1959; NIST Federal Register Notice 59-5442
US, UK, Canada, Australia, New Zealand, South Africa · Reviewed 2026-07-01
How to Convert Millimeter to Inch
To convert from Millimeter (mm) to Inch (in), multiply the value by 0.0393700787.
公式： in = mm × 0.0393700787
反向： mm = in × 25.4
分步示例
- Start with your value in Millimeter. For example: 5 mm
- Multiply by the conversion factor: 5 x 0.0393700787
- The result is: 0.19685 in
关于Millimeter
The millimeter equals one thousandth of a meter and is used for precise measurements in engineering and manufacturing.
常见用途： engineering, rainfall measurement, manufacturing.
关于Inch
The inch is an imperial unit equal to 1/12 of a foot or 2.54 centimeters. It is widely used in the US and UK for small measurements.
趣味事实： The inch was historically defined as the width of a man's thumb.
常见用途： screen sizes, construction, clothing.
Frequently Asked Questions
How many Inch are in 1 Millimeter?
There are exactly 0.0393700787 Inch in 1 Millimeter. This means the conversion factor from Millimeter to Inch is 0.0393700787.
What is the formula to convert Millimeter to Inch?
The formula to convert Millimeter to Inch is: in = mm × 0.0393700787. For example, to convert 10 Millimeter to Inch, you would multiply 10 by 0.0393700787.
What is a Millimeter?
The millimeter equals one thousandth of a meter and is used for precise measurements in engineering and manufacturing.
What is a Inch?
The inch is an imperial unit equal to 1/12 of a foot or 2.54 centimeters. It is widely used in the US and UK for small measurements.
What are the common uses of Millimeter?
The Millimeter is commonly used in engineering, rainfall measurement, manufacturing.
相关Length转换
Cite this page
UnitConvertLab. (2026). Millimeter to Inch converter. UnitConvertLab. Retrieved from https://unitconvertlab.com/convert/millimeter-to-inch