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Pixels, physical dimensions, or target resolution.
Quick math
DPI & PPI calculator
Check whether an image has enough pixels for a planned print size.
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Screen density
163.18 PPI
Pixel diagonal
4,406 px
Print size (inches)
12.8 × 7.2 in
Print size (centimeters)
32.51 × 18.29 cm
PPI describes a physical display’s pixel density. DPI is commonly used as a print-resolution target; they are related but not interchangeable.
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What does dpi & ppi calculator do?
The DPI/PPI calculator derives screen pixel density from pixel width, pixel height, and physical diagonal, then shows the image's print dimensions at a chosen DPI in inches and centimeters.
- Input
- Pixels, physical dimensions, or target resolution.
- Result
- Calculated PPI and corresponding print measurements.
- Price
- Free
- Account
- Not required
How to use dpi & ppi calculator
Choose your settings
Check whether an image has enough pixels for a planned print size.
Save or copy
Calculated PPI and corresponding print measurements.
A practical tip
300 PPI is a common high-quality print target, but viewing distance and printer matter.
When to use dpi & ppi calculator
Estimate the PPI of a 27-inch 4K monitor from its advertised dimensions.
Check how large a 6000×4000 photo prints at 300 DPI.
Compare whether a raster asset has enough pixels for two proposed print sizes.
Worked example
A concrete dpi & ppi calculator example
- Input
- 3840 × 2160 pixels on a 27-inch diagonal
- Settings
- Print density: 300 DPI
- Result
- 163.18 PPI screen density; print size 12.8 × 7.2 in, or 32.51 × 18.29 cm.
What to expect
How it works
Pixel diagonal is the hypotenuse of pixel width and height. Dividing it by the physical diagonal gives pixels per inch. Print width and height are calculated independently by dividing each pixel dimension by the selected print DPI, then multiplying inches by 2.54 for centimeters.
Know before using
Limits and edge cases
- The PPI calculation assumes square pixels and an accurate viewable diagonal; bezels, rounded corners, scaling, and manufacturer rounding are not modeled.
- The chosen print DPI is a sizing target, not a prediction of printer dots, ink behavior, resampling quality, or perceived sharpness.
Common questions
DPI & PPI calculator FAQ
Is dpi & ppi calculator free to use?
Yes. DPI & PPI calculator is free to use.
Does dpi & ppi calculator keep my work private?
Yes. Your work stays private while you use the tool — nothing you enter is uploaded.
What is the difference between PPI and DPI here?
PPI describes source or display pixels per physical inch. The DPI field is used as the desired print-density divisor for calculating output dimensions.
Will changing DPI change the number of pixels?
No. In this calculator the source pixel dimensions stay fixed; changing DPI changes only the corresponding physical print size.