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How to Convert from Pixel/inch [pixel/in] to Dot/millimeter [dot/mm]
Learn how to convert digital image resolution units from pixel per inch (ppi) to dot per millimeter (dot/mm) with this easy-to-use online converter tool.
Please check your input. It must be a valid numeric value.
Pixel/inch [pixel/in] to Dot/millimeter [dot/mm] Conversion Table
| Pixel/inch [pixel/in] | Dot/millimeter [dot/mm] |
|---|
Custom Unit Conversion Table Generator – Instant Printable Conversion Tables
Enter the starting number (positive decimal or integer ≥ 0). Example: 0.1, 1, 5.
Enter the ending number (positive decimal or integer > Start Value). Example: 10, 50, 100.
Enter the step size (positive decimal > 0 and < End Value – Start Value). Example: 1.0, 2.5.
| Pixel/inch [pixel/in] | Dot/millimeter [dot/mm] |
|---|
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What Is This Tool?
This converter tool helps you translate digital image resolution values from pixels per inch (pixel/in) to dots per millimeter (dot/mm). It is essential for matching image resolutions across display, printing, and scanning technologies.
How to Use This Tool?
- Enter the value in pixels per inch (pixel/in) you want to convert.
- Select the target unit as dots per millimeter (dot/mm).
- Click convert to see the equivalent resolution value.
- Use the results to align image or device resolution settings.
Key Features
- Converts pixel density from pixel/inch to dot/millimeter accurately.
- Supports digital image resolution measurements for printing and scanning workflows.
- Browser-based and simple to use without any software installation.
- Provides examples for quick understanding of conversion results.
Examples
- 100 pixel/in equals 3.93700787 dot/mm
- 300 pixel/in corresponds to 11.81102361 dot/mm
Common Use Cases
- Describing display sharpness of monitors and smartphones in ppi and converting to print resolution units.
- Specifying printhead or halftone resolution in dots per millimeter for printer settings.
- Calibrating scanner or camera sensor resolutions between pixel and dot density measurements.
- Ensuring image data matches hardware capabilities in printing and imaging workflows.
Tips & Best Practices
- Always verify the unit definitions to ensure correct interpretation of resolution values.
- Consider differences between display pixel density and printer/scanner dot density when planning workflows.
- Use this conversion for linear (one-dimensional) resolution comparisons rather than area resolution.
- Apply the conversion to align resolution metrics across different imaging devices.
Limitations
- The conversion reflects linear resolution and does not measure area resolution.
- Pixel density for screens may differ significantly from dot density achievable by printers or scanners.
- Variations in printer technology and halftone screening can influence practical dot/mm results.
Frequently Asked Questions
- What does pixel/inch measure?
- Pixel/inch indicates the number of pixels contained in one inch of a digital image or display, reflecting image sharpness or detail.
- Why convert pixel/inch to dot/millimeter?
- Converting pixel/inch to dot/millimeter helps match image resolution metrics from screens or print preparation units to printing or scanning device units.
- Is dot/millimeter the same as dots per inch?
- Dot/millimeter is a linear resolution unit that can be converted to dots per inch using the relation 1 dot/mm = 25.4 dots per inch.
- Can I use this conversion for 2D resolution measurements?
- No, this conversion applies to linear, one-dimensional resolution measures only, not area resolution.
Key Terminology
- Pixel/inch [pixel/in]
- A linear measure representing the number of pixels contained in one inch, indicating image or display resolution.
- Dot/millimeter [dot/mm]
- A linear spatial-resolution unit specifying the number of dots placed along one millimeter, used in printing and scanning contexts.
- PPI
- Abbreviation for pixels per inch, commonly used to describe image sharpness and resolution.
- Halftone resolution
- The resolution related to printheads or presses that produce images using dots, typically measured in dot/mm.