Millimeter to Inch Converter
免费长度转换器, 即时换算英里、公里、英尺、米、英寸和码
1Millimeter=0.0393700787Inch
1 Inch = 25.4 Millimeter
Millimeter
- Symbol
- mm
- System
- Metric/Imperial
- Dimension
- Various
Inch
- Symbol
- in
- System
- Metric/Imperial
- Dimension
- Various
Quick Reference Table
| Millimeter | Inch | Inch | Millimeter |
|---|---|---|---|
| 1 | 0.0393700787 | 1 | 25.4 |
| 2 | 0.0787401575 | 2 | 50.8 |
| 3 | 0.1181102362 | 3 | 76.2 |
| 5 | 0.1968503937 | 5 | 127 |
| 10 | 0.3937007874 | 10 | 254 |
| 25 | 0.9842519685 | 25 | 635 |
| 50 | 1.968503937 | 50 | 1270 |
| 100 | 3.937007874 | 100 | 2540 |
| 500 | 19.6850393701 | 500 | 12700 |
| 1000 | 39.3700787402 | 1000 | 25400 |
Conversion Formula
Inch = Millimeter × 0.0393700787
Millimeter = Inch × 25.4
Factors are from BIPM SI brochure and NIST SP 811, stored unrounded and computed via a base unit. Reverse factor is 1 ÷ 0.0393700787.
How to convert Millimeter to Inch
Multiply the value in millimeter by 0.0393700787 to get inch. For example, 5 Millimeter = 0.1968503937 Inch. All results in the 长度和距离 converter update instantly as you type, so you can see every unit at once without manual math.
Common mistakes
Do not round the factor to 0.03 too early — keep full precision until the final display. For 长度和距离, always verify critical calculations (medicine, engineering) with a second source.
FAQ
- How many Inch in 1 Millimeter?
- 1 Millimeter = 0.0393700787 Inch.
- How many Millimeter in 1 Inch?
- 1 Inch = 25.4 Millimeter.
- What is the source?
- BIPM/NIST via OmniConverter base-unit engine. Source table and formula above are exact.
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