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PPI · PPCM · DISPLAY · PRINT
PPI Calculator and PPI to PPCM Converter
Calculate screen density, physical dimensions and viewing distance, compare displays, plan print sizes and convert PPI to PPCM.
PPI · PPCM · DPR · PRINT
Pixel density & print studio
Calculate screen density, physical dimensions and viewing distance, compare displays, plan print sizes and convert PPI to PPCM.
Display setup
Compare up to three displays with the same measurements.
Pixel density91.79 PPI36.14 PPCM
Less denseMore dense
Pixel pitch0.2767 mm
Physical size20.92 × 11.77 in
Megapixels2.07 MP
Aspect ratio16:9
Theoretical viewing distance95.1 cm
Display comparison
Pixel magnifier
Density depends on viewing distance
The viewing-distance estimate uses one arcminute as a theoretical reference and is not a guarantee of visual acuity.
Print planner
Calculate print dimensions and the pixels required for a chosen paper size.
The uploaded image remains on your device.
Print size20 × 13.33 in
Required pixels2480 × 3508 px
Common print outputs
DPR & CSS pixels
Convert CSS dimensions to physical device pixels.
Device pixels780 × 1688 px
Quick PPI/PPCM conversion
300 PPI = 118.11 PPCM
How PPI is calculated
Diagonal pixels are divided by the physical diagonal in inches. The same density divided by 2.54 gives PPCM.
PPI is not the same as DPI
PPI describes pixels in an image or display. DPI normally describes physical dots placed by a printer.
CSS pixels can differ from device pixels
High-density screens can use several physical device pixels for one CSS pixel. DPR expresses this ratio.
Formulas
PPI = √(width² + height²) ÷ diagonal(in)
PPCM = PPI ÷ 2.54
pixel pitch(mm) = 25.4 ÷ PPI
PPI calculator FAQ
How do I calculate PPI?
Divide the diagonal pixel count by the screen diagonal in inches.
How do I convert PPI to PPCM?
Divide PPI by 2.54. To convert PPCM back to PPI, multiply by 2.54.
What is pixel pitch?
Pixel pitch is the physical distance between neighboring pixels. In millimeters it equals 25.4 divided by PPI.
Is PPI the same as DPI?
No. PPI describes image or display pixels, while DPI generally describes printer dots.
How large can I print an image?
Divide the pixel width and height by the selected PPI to estimate the physical print dimensions.
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