Pixel per inch to Dot per millimeter Converter
免费图像分辨率转换器, 即时换算 DPI、PPI、每厘米点数和每毫米像素
Pixel per inch
- Symbol
- PPI
- System
- Metric/Imperial
- Dimension
- Various
Dot per millimeter
- Symbol
- dot/mm
- System
- Metric/Imperial
- Dimension
- Various
Quick Reference Table
| Pixel per inch | Dot per millimeter | Dot per millimeter | Pixel per inch |
|---|---|---|---|
| 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
Dot per millimeter = Pixel per inch × 0.0393700787
Pixel per inch = Dot per millimeter × 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 Pixel per inch to Dot per millimeter
Multiply the value in pixel per inch by 0.0393700787 to get dot per millimeter. For example, 5 Pixel per inch = 0.1968503937 Dot per millimeter. All results in the image resolution 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 image resolution, always verify critical calculations (medicine, engineering) with a second source.
FAQ
- How many Dot per millimeter in 1 Pixel per inch?
- 1 Pixel per inch = 0.0393700787 Dot per millimeter.
- How many Pixel per inch in 1 Dot per millimeter?
- 1 Dot per millimeter = 25.4 Pixel per inch.
- What is the source?
- BIPM/NIST via OmniConverter base-unit engine. Source table and formula above are exact.
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