Whether you’re buying a new monitor, phone, or TV — or designing graphics for a specific screen — knowing the pixel density (PPI) tells you how sharp the display actually looks. A higher PPI means sharper images and text. Our free PPI Calculator computes pixels per inch for any screen in seconds.
PPI Calculator – Pixels Per Inch
PPI / Pixel Density Calculator
What Is PPI (Pixels Per Inch)?
PPI (Pixels Per Inch) measures the pixel density of a display — how many individual pixels fit in one linear inch. A higher PPI means each pixel is smaller, so images and text appear sharper and more detailed at normal viewing distances.
PPI Formula: PPI = √(Width² + Height²) ÷ Screen diagonal (inches)
PPI Chart – Common Devices
| Device | Resolution | Screen Size | PPI |
|---|---|---|---|
| iPhone 16 Pro | 2556×1179 | 6.3″ | 460 PPI |
| Samsung S24 Ultra | 3088×1440 | 6.8″ | 500 PPI |
| MacBook Pro 14″ | 3024×1964 | 14.2″ | 254 PPI |
| 27″ 4K Monitor | 3840×2160 | 27″ | 163 PPI |
| 27″ 1080p Monitor | 1920×1080 | 27″ | 82 PPI |
| 55″ 4K TV | 3840×2160 | 55″ | 80 PPI |
What Is a Good PPI for Different Use Cases?
- Smartphone: 300+ PPI is Retina-quality (Apple's threshold for 10–12 inch viewing distance). Most flagship phones are 400–500 PPI.
- Laptop/monitor (desk use): 100–150 PPI is acceptable at 2–3 feet; 200+ PPI is noticeably sharper.
- TV (10 feet away): 80–100 PPI is excellent for living-room viewing distance — human eye can't perceive more at that distance.
- Photo/video editing: Aim for 100+ PPI for accurate color and detail rendering.
PPI vs. DPI – What's the Difference?
PPI (Pixels Per Inch) is a screen/display measurement. DPI (Dots Per Inch) is a printing measurement. When people talk about monitor or phone screen sharpness, they always mean PPI. DPI is relevant for printers (standard photo print = 300 DPI) and mice (gaming mice are rated in DPI for sensitivity).
Frequently Asked Questions
Does higher PPI always mean better display?
Not always. Above ~300 PPI at normal viewing distance, the human eye cannot distinguish individual pixels. Beyond that point, other factors matter more: color accuracy, brightness, contrast ratio, and refresh rate.
What PPI is Retina display?
Apple defines "Retina" as a PPI where individual pixels are indistinguishable at the typical use distance. For iPhones (held ~10 inches away), that's ~300 PPI. For MacBooks (held ~20 inches away), ~200 PPI qualifies as Retina.
How do I find my monitor's PPI?
Check your monitor's specs sheet for the resolution (e.g., 2560×1440) and screen diagonal (e.g., 27 inches), then enter them in the calculator above. Manufacturer spec sheets often list PPI directly as well.