Tech
DPI Calculator
A DPI calculator estimates pixel density (DPI/PPI) by comparing pixel resolution against physical diagonal size in inches.
Quick answer
Enter pixel width and height.
What this tells you
- •Enter pixel width and height.
- •Enter physical diagonal size in inches.
- •Get DPI/PPI estimate and implied physical width/height.
How to Use
- 1Enter display pixel width and pixel height.
- 2Enter diagonal size in inches.
- 3Calculate to view estimated DPI/PPI and print-size assumptions.
How It Works
Formula
DPI = sqrt(widthPx^2 + heightPx^2) / diagonalInchesThe tool computes pixel diagonal and divides by physical diagonal inches to estimate density.
Calculation note: values are processed in the order shown above, using the current input units.
Worked Examples
1080p on 24-inch display
Width1920
Height1080
Diagonal24
Result~91.79 DPI
Common mistakes
- Confusing DPI with image export DPI metadata
- Using incorrect diagonal size
- Mixing PPI and printer DPI context
Frequently Asked Questions
For display density estimation, DPI and PPI are often used interchangeably.
It estimates dpi calculator outputs using the visible inputs and formula assumptions on this page.
Results are calculation estimates based on your inputs and stated assumptions. Verify values for critical decisions.