Formula
Each side is pixels divided by dots per inch:
inches = pixels / DPI
Centimeters are inches times 2.54. The DPI page runs this division backward. A single edge in inches, centimeters, and a size snapped to one-eighth inch are separate pages. Screen sharpness stays on the PPI calculator.
Assumptions
- The DPI is the density you ask the printer to use.
- Pixels are not resampled before printing.
- The inch is the international inch, so 1 inch is 2.54 centimeters.
Worked example
2,400 by 3,000 pixels at 300 DPI print at 8 × 10 in.
Input definitions
- Width and height
- The image size in pixels.
- Print density
- Dots per inch. 300 is a common photo print setting.
Limitations
A large print at a low DPI can look soft. This page reports the size. It does not judge sharpness or add a bleed margin.
Questions
What if I print at 150 DPI instead of 300?
The print becomes twice as wide and twice as tall, because each side is divided by half as many dots.
Does this measure a monitor?
No. A monitor has a fixed diagonal. Use the screen PPI calculator for that.