PPI & Pixel Density Calculator
Calculate pixels per inch for any screen, or convert between pixels, inches, centimetres, and millimetres.
Screen Details
Popular Display PPI Reference
| Device | Resolution | PPI |
|---|---|---|
| iPhone 15 Pro | 2556 × 1179 | 460 |
| iPhone 15 | 2556 × 1179 | 460 |
| Samsung Galaxy S24 Ultra | 3088 × 1440 | 500 |
| MacBook Pro 14" (M3) | 3024 × 1964 | 254 |
| MacBook Pro 16" (M3) | 3456 × 2234 | 254 |
| iPad Pro 13" | 2752 × 2064 | 264 |
| Dell 27" 4K Monitor | 3840 × 2160 | 163 |
| Full HD 24" Monitor | 1920 × 1080 | 92 |
| Apple Studio Display 27" | 5120 × 2880 | 218 |
About the PPI Calculator
PPI (Pixels Per Inch) is a measure of pixel density — how many pixels are packed into each inch of a display. A higher PPI produces sharper, crisper images. It is calculated by dividing the diagonal pixel count (derived from the width and height resolution) by the physical diagonal screen size in inches.
The formula is: PPI = √(width² + height²) / diagonal_inches. Apple's Retina displays are typically 220+ PPI — a density high enough that individual pixels are not distinguishable at normal viewing distances.
Use the Calculate PPI tab to find the pixel density of any screen — from phones to monitors. Use the Convert tab to translate pixel values to real-world physical measurements (inches, centimetres, millimetres) for a given display's PPI.
All calculations happen entirely in your browser. No data is sent to any server.
- 100% free — no account needed
- Runs in your browser
- Nothing is uploaded
Frequently asked questions
Is PPI Calculator really free?
Yes. PPI Calculator is completely free on PureBrowser — every feature, with no account, no trial, and no credit card.
Does PPI Calculator upload my data?
No. PPI Calculator runs entirely inside your browser, so anything you type, paste, or open stays on your own device.
Do I need to sign up or install anything?
Neither. There is no account and nothing to download — open the page and PPI Calculator is ready to use on desktop or mobile.
Does PPI Calculator work offline?
Once the page has loaded, yes. All of the processing happens locally in your browser, so it keeps working without a connection.
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