Popular digital image resolution conversions
- Dots per inch to dots per centimeter1 dpi = 0.393701 dot/cm
- Dots per inch to dots per millimeter1 dpi = 0.0393701 dot/mm
- Dots per centimeter to dots per inch1 dot/cm = 2.54 dpi
- Dots per centimeter to dots per millimeter1 dot/cm = 0.1 dot/mm
- Dots per millimeter to dots per inch1 dot/mm = 25.4 dpi
- Dots per millimeter to dots per centimeter1 dot/mm = 10 dot/cm
About digital image resolution units
Print and scan resolution is a linear density of dots or pixels. Print shops commonly ask for 300 dpi, which is about 118 dots per centimetre. PPI and DPI convert identically — PPI refers to image pixels, DPI to printer dots.
Digital Image Resolution unit reference
| Unit | Symbol | Value in dot/m | System |
|---|---|---|---|
| Dot per meter | dot/m | 1 dot/m | SI |
| Dot per centimeter | dot/cm | 100 dot/m | Metric |
| Dot per millimeter | dot/mm | 1,000 dot/m | Metric |
| Dot per inch | dpi | 39.370079 dot/m | US customary |
| Pixel per inch | ppi | 39.370079 dot/m | US customary |
Frequently asked questions
What is the SI unit of digital image resolution?
This converter uses the dot per meter (dot/m) as its reference unit; every other unit is defined relative to it.
How many digital image resolution units can I convert?
5 units are supported here, across SI, Metric, US customary systems. Every pair can be converted in both directions.
Does this digital image resolution converter work offline?
Yes. Once the page has loaded, every calculation runs locally in your browser — nothing is sent to a server.