FREE ONLINE PPI CALCULATOR
PPI Calculator
Calculate pixels per inch and screen pixel density from pixel resolution and diagonal screen size. Get PPI, pixel pitch, aspect ratio, and display details instantly.
Pixel Density Calculator
Enter valid pixel dimensions and screen size.
PPI
91.79 PPIPPI = Diagonal Pixels ÷ Diagonal Inches
Pixels Per Inch Calculator
91.79 PPI
1920 × 1080Pixel Resolution
1920 × 1080Screen Diagonal
24.00 inScreen Diagonal (cm)
60.96 cmDiagonal Pixels
2202.91 pxAspect Ratio
16:9Pixel Pitch
0.277 mmDensity Reference
Standard Densitygeneral reference · viewing distance · screen size · display technology · scaling · content · vision
Instant calculation
Calculate PPI and pixel density instantly from resolution and screen size.
Browser-based
All calculations run directly in your browser.
Free online
Use the PPI Calculator for free with no sign-up required.
COMPLETE PPI INFORMATION
Everything You Need for Pixel Density
Calculate PPI, pixels per inch, pixel pitch, aspect ratio, and screen density from resolution and diagonal display size.
1920 × 1080Pixel Width
1920 pxPixel Height
1080 pxScreen Diagonal
24.00 inDiagonal Pixels
2202.91 pxPPI
91.79 PPIPixels Per Inch
91.79 px/inPixel Pitch
0.277 mmAspect Ratio
16:9Orientation
LandscapeHOW IT WORKS
Calculate PPI in 3 Simple Steps
Enter screen resolution
Enter the display width and height in pixels.
Enter screen size
Enter the diagonal screen size in inches or centimeters.
View pixel density
The calculator instantly shows PPI, pixel pitch, aspect ratio, and related display information.
What is PPI?
PPI means pixels per inch and describes how many pixels are packed into one inch of a digital display or image area.
Pixel Density
Pixel density describes how tightly pixels are packed within a physical display area. Higher PPI means more pixels are placed into each inch.
Pixel Pitch
Pixel pitch is the physical distance between pixels and can be estimated from PPI using 25.4 ÷ PPI.
Screen Resolution
Screen resolution describes the number of horizontal and vertical pixels, such as 1920 × 1080.
PPI vs DPI
PPI describes pixels per inch, while DPI usually describes printer dots per inch. The terms are related but are not interchangeable.
DPI CalculatorCOMMON PPI EXAMPLES
Common Screen Sizes and Pixel Density Examples
1920 × 1080
24.00 in
Desktop Monitor
91.79 PPI1920 × 1080
27.00 in
Large Full HD Monitor
81.59 PPI2560 × 1440
27.00 in
QHD Monitor
108.79 PPI3840 × 2160
27.00 in
4K Monitor
163.18 PPI3840 × 2160
32.00 in
Large 4K Monitor
137.68 PPI2560 × 1600
13.30 in
High-Density Laptop
226.98 PPIPPI Comparison
| Resolution | Screen Size | PPI | Pixel Pitch | Typical Example |
|---|---|---|---|---|
| 1920 × 1080 | 24.00 in | 91.79 PPI | 0.277 mm | Desktop monitor |
| 1920 × 1080 | 27.00 in | 81.59 PPI | 0.311 mm | Large Full HD monitor |
| 2560 × 1440 | 27.00 in | 108.79 PPI | 0.233 mm | QHD monitor |
| 3840 × 2160 | 27.00 in | 163.18 PPI | 0.156 mm | 4K monitor |
| 3840 × 2160 | 32.00 in | 137.68 PPI | 0.184 mm | Large 4K monitor |
PPI Calculation Formula
Diagonal Pixels = √(Width² + Height²)
PPI = Diagonal Pixels ÷ Diagonal Inches
Pixel Pitch (mm) = 25.4 ÷ PPI
1920 × 1080 at 24 inches
Diagonal Pixels: √(1920² + 1080²) ≈ 2202.91
PPI
2202.91 ÷ 24 ≈ 91.79 PPI
Pixel Pitch
25.4 ÷ 91.79 ≈ 0.277 mm
WHY PIXEL DENSITY MATTERS
Why PPI and Pixel Density Matter
PPI helps describe how densely pixels are packed into a physical display area and can help compare screens with different resolutions and sizes.
Monitor Comparison
Compare monitors with different resolutions and physical screen sizes using their PPI.
Laptop Displays
Understand how screen resolution and compact display size affect pixel density.
Mobile & Tablet Displays
Compare pixel density across smaller high-resolution screens.
UI & Design Testing
Use PPI as one reference when evaluating how interfaces and graphics may appear across displays.
More Image & Display Calculators
Use our related tools to work with DPI, pixels, inches, print size, and image resolution.
FAQ & SUPPORT
Frequently Asked Questions
Calculate the diagonal pixel count using the screen width and height in pixels, then divide it by the diagonal screen size in inches.
PPI = √(pixel width² + pixel height²) ÷ diagonal screen size in inches.
PPI means pixels per inch. It describes how many pixels are packed into one inch of a display or image area.
PPI describes pixels per inch, while DPI usually describes printer dots per inch. PPI is commonly used for digital pixel density, while DPI is commonly associated with printing. DPI Calculator
No. PPI depends on both pixel resolution and physical screen size. The same resolution produces different PPI values on different screen sizes.
Yes. The PPI Calculator is free to use and runs directly in your browser.
FAST & EASY
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Enter your screen resolution and diagonal size to instantly calculate pixels per inch, pixel pitch, and display density.
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Browser-based
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