PPI Calculator
Calculate pixels per inch for any display. Essential for understanding display sharpness and quality.
Result
- PPI
- 0
- Total Pixels
- 0 megapixels
Conversion Guide
Conversion
D
Diagonal Pixels
Diagonal = √(Width² + Height²)
Calculate diagonal pixel count using Pythagorean theorem
P
PPI
PPI = Diagonal Pixels ÷ Diagonal (inches)
Divide diagonal pixels by screen diagonal size
Step-by-Step Scenario
Example Scenario
Resolution
1920×1080
Diagonal
24 inches
1
Calculate Diagonal Pixels
- √(1920² + 1080²) = √(3,686,400 + 1,166,400)
- = √4,852,800 = 2,203 pixels
Use Pythagorean theorem to find diagonal pixel count
2
Calculate PPI
- PPI = 2,203 ÷ 24
Additional Examples
4K Monitor
Resolution: 3840×2160
Size: 27 inches
PPI
≈163 PPI
Smartphone
Resolution: 1080×1920
Size: 5.5 inches
PPI
≈401 PPI
Characteristics of PPI
Display Sharpness
Higher PPI means sharper display. Retina displays (220+ PPI) provide crisp text and images.
Device Comparison
Compare PPI across different devices. Smartphones typically have 300-500+ PPI, monitors 90-150 PPI.
Viewing Distance
PPI requirements vary by viewing distance. Closer viewing (phones) needs higher PPI than distant viewing (TVs).
Quality Indicator
PPI is a key indicator of display quality. Higher PPI generally means better image sharpness and clarity.
Important Notes
- PPI (Pixels Per Inch) measures display sharpness. It's calculated by dividing diagonal pixel count by diagonal screen size in inches.
- Higher PPI means sharper display, but may require more processing power and can make UI elements appear smaller.
- Viewing distance matters: phones need 300+ PPI (viewed close), TVs need 40-100 PPI (viewed far), monitors need 90-150 PPI.
- Retina displays are typically 220+ PPI, where individual pixels are not visible at normal viewing distance.
- For web development, consider PPI when designing responsive layouts. Higher PPI displays may need different image resolutions.
Frequently Asked Questions
Find answers to common questions about PPI calculation.
PPI (Pixels Per Inch) measures display sharpness. Higher PPI = sharper display. Retina displays are typically 220+ PPI. It's calculated by dividing diagonal pixel count by diagonal screen size in inches.
TVs: 40-100 PPI. Monitors: 90-150 PPI. Smartphones: 300-500+ PPI. Retina displays: 220+ PPI. Higher PPI provides sharper images but may require more processing power.
PPI = √(Width² + Height²) ÷ Diagonal (inches). This calculates the diagonal pixel count, then divides by the screen diagonal size to get pixels per inch.
PPI (Pixels Per Inch) refers to screen resolution. DPI (Dots Per Inch) refers to print resolution. For digital displays, PPI is the correct term.
PPI determines display sharpness. Higher PPI means sharper text and images. It's especially important for reading text and viewing detailed graphics.
Yes, enter the pixel dimensions (width × height) and diagonal size in inches. The calculator will determine the PPI for any display.