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Pixel to MM Formula:
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Pixel to millimeter conversion is essential in digital design and printing to translate screen-based measurements into physical dimensions. The conversion depends on the DPI (dots per inch) value, which represents the resolution of the output device.
The calculator uses the formula:
Where:
Explanation: This formula converts pixel dimensions to physical millimeters based on the output device's resolution.
Details: DPI (dots per inch) is crucial because it determines how many pixels are printed per inch. Higher DPI values result in smaller physical dimensions for the same number of pixels, producing higher quality prints with finer detail.
Tips: Enter the number of pixels and the DPI value of your output device. Both values must be positive numbers. Common DPI values include 72 (screen), 300 (standard printing), and 600 (high-quality printing).
Q1: Why does DPI affect the conversion?
A: DPI determines how many pixels are represented in one inch. Higher DPI means more pixels per inch, resulting in smaller physical dimensions for the same pixel count.
Q2: What's the difference between DPI and PPI?
A: DPI (dots per inch) refers to printer resolution, while PPI (pixels per inch) refers to screen resolution. For practical purposes, they are often used interchangeably in conversion calculations.
Q3: How do I know what DPI to use?
A: For screen design, use 72-96 DPI. For printing, common values are 300 DPI for documents and 150 DPI for large format prints. Check your printer specifications for optimal DPI settings.
Q4: Can I convert mm back to pixels?
A: Yes, the reverse formula is: Pixel = (mm × DPI) / 25.4
Q5: Why is the conversion not accurate for different screens?
A: Screen sizes and resolutions vary greatly. This conversion is most accurate for print media where DPI is fixed. For screens, physical dimensions depend on the specific device's pixel density.