Dot per inch to Dot per millimeter Converter
1 dot per inch is about 0.03937007874 dots per millimeter. Convert dots per inch (dpi) to dots per millimeter (dot/mm) below: type a value and the result updates as you type.
dpi to dot/mm calculator
Result
Dot per inch to Dot per millimeter conversion
1 dpi ≈ 0.03937007874 dot/mmone dot per inch in dots per millimeter
1 dot/mm = 25.4 dpione dot per millimeter in dots per inch
Dot per inch (dpi): Number of printed dots per inch (25.4 mm). The usual unit for printers and scanners.
Dot per millimeter (dot/mm): Number of dots per millimeter. Used for label and thermal printers (8 dot/mm is about 203 dpi).
Source:Dot per inch: International yard and pound agreement (1959); Dot per millimeter: SI Brochure, 9th edition (BIPM, 2019)
How to convert dots per inch to dots per millimeter
To convert dots per inch to dots per millimeter, divide the number of dots per inch by 25.4.
Formula
dot/mm = dpi ÷ 25.4
Examples
- 5 dpi = 5 ÷ 25.4 ≈ 0.1968503937 dot/mm
- 25 dpi = 25 ÷ 25.4 ≈ 0.9842519685 dot/mm
- 100 dpi = 100 ÷ 25.4 ≈ 3.937007874 dot/mm
Dot per inch to Dot per millimeter conversion table
| Dot per inch (dpi) | Dot per millimeter (dot/mm) |
|---|---|
| 0.1 dpi | 0.003937007874 dot/mm |
| 0.5 dpi | 0.01968503937 dot/mm |
| 1 dpi | 0.03937007874 dot/mm |
| 2 dpi | 0.07874015748 dot/mm |
| 3 dpi | 0.1181102362 dot/mm |
| 5 dpi | 0.1968503937 dot/mm |
| 10 dpi | 0.3937007874 dot/mm |
| 20 dpi | 0.7874015748 dot/mm |
| 25 dpi | 0.9842519685 dot/mm |
| 50 dpi | 1.968503937 dot/mm |
| 100 dpi | 3.937007874 dot/mm |
| 250 dpi | 9.842519685 dot/mm |
| 500 dpi | 19.68503937 dot/mm |
| 1000 dpi | 39.37007874 dot/mm |
Values rounded to 10 significant digits where needed.
Frequently asked questions
- How many dots per millimeter are in one dot per inch?
- One dot per inch is about 0.03937007874 dots per millimeter.
- How do I convert dots per millimeter to dots per inch?
- To convert dots per millimeter to dots per inch, multiply the number of dots per millimeter by 25.4. The formula is dpi = dot/mm × 25.4.
- Is this conversion exact?
- Yes. Both units have exact definitions and the factor 25.4 is exact. Displayed results are only rounded when they have many decimal places.
- Which is larger, a dot per inch or a dot per millimeter?
- A dot per millimeter is 25.4 times larger than a dot per inch. In other words, a dot per inch is about 0.03937007874 of a dot per millimeter.