Pixels to Inches Converter – px to in by PPI
Convert pixels to inches using PPI. Formula: inches = pixels ÷ PPI. Includes conversion table for 72, 96, 150, and 300 PPI with real examples.
Pixels to Inches Converter (px to in)
Converting pixels to inches depends on one critical value: PPI (pixels per inch), also called resolution. Pixels have no absolute physical size — a 100-pixel image can be 1 inch on a high-resolution screen or 1.39 inches on a standard monitor. The W3C CSS specification defines the reference pixel at 96 PPI, and ISO 12233 governs resolution measurement standards for digital imaging. Enter your pixel count and PPI above to get the exact inch measurement.
What Is PPI (Pixels Per Inch)?
PPI (pixels per inch) describes how many pixels fit into one inch of screen or print space. It determines the physical size of any pixel-based measurement. Common PPI values by use case:
- 96 PPI — Windows standard screen resolution (W3C CSS reference pixel)
- 72 PPI — Traditional Mac screen standard and web image baseline
- 120–144 PPI — Laptops and mid-range monitors
- 227–458 PPI — Retina and high-DPI smartphone displays
- 300 PPI — Standard print resolution (magazines, photo prints)
Pixels to Inches Formula
The formula to convert pixels to inches is:
inches = pixels ÷ PPI
To convert inches back to pixels, multiply by PPI:
pixels = inches × PPI
For example: 960 pixels at 96 PPI = 960 ÷ 96 = 10 inches.
Pixels to Inches Conversion Table (Common PPI Values)
| Pixels | at 72 PPI | at 96 PPI | at 150 PPI | at 300 PPI |
|---|---|---|---|---|
| 72 px | 1.00 in | 0.75 in | 0.48 in | 0.24 in |
| 96 px | 1.33 in | 1.00 in | 0.64 in | 0.32 in |
| 150 px | 2.08 in | 1.56 in | 1.00 in | 0.50 in |
| 300 px | 4.17 in | 3.13 in | 2.00 in | 1.00 in |
| 500 px | 6.94 in | 5.21 in | 3.33 in | 1.67 in |
| 720 px | 10.00 in | 7.50 in | 4.80 in | 2.40 in |
| 960 px | 13.33 in | 10.00 in | 6.40 in | 3.20 in |
| 1080 px | 15.00 in | 11.25 in | 7.20 in | 3.60 in |
| 1920 px | 26.67 in | 20.00 in | 12.80 in | 6.40 in |
| 3840 px | 53.33 in | 40.00 in | 25.60 in | 12.80 in |
Real-World Examples
Example 1 – Web banner design: A designer creates a 728 px wide banner displayed at 96 PPI. Physical width: 728 ÷ 96 = 7.58 inches — roughly the width of an A4 page.
Example 2 – Print photo: A photo exported at 1800 × 1200 px sent to a 300 PPI printer. Width: 1800 ÷ 300 = 6 inches. Height: 1200 ÷ 300 = 4 inches — a standard 6×4 inch print.
Example 3 – iPhone 15 display: The iPhone 15 has a 2556 × 1179 px screen at 460 PPI. Physical screen height: 2556 ÷ 460 = 5.56 inches — matching Apple's stated 6.1-inch diagonal specification.
Example 4 – PowerPoint slide: A 1920 × 1080 px presentation displayed on a 96 PPI projector measures 20 × 11.25 inches physically.
Screen vs. Print: Why PPI Matters
| Use Case | Typical PPI | Example: 300 px = |
|---|---|---|
| Web / Screen (Windows) | 96 PPI | 3.13 inches |
| Web / Screen (Mac) | 72 PPI | 4.17 inches |
| Laptop HD display | 140 PPI | 2.14 inches |
| Standard print | 300 PPI | 1.00 inch |
| High-quality print | 600 PPI | 0.50 inches |
Common PPI Values for Popular Devices
- Full HD monitor (1920×1080, 24 in): ~92 PPI
- 4K monitor (3840×2160, 27 in): ~163 PPI
- iPhone 15: 460 PPI
- Samsung Galaxy S24: 416 PPI
- iPad Pro (M4): 264 PPI
- MacBook Pro 14-inch (M3): 254 PPI
Limitations of This Calculator
- Results depend entirely on the PPI value you enter — always verify the PPI of your specific device or print setting
- NIST defines the inch as exactly 25.4 mm; this calculator uses that standard for all physical size outputs
- Operating systems may apply display scaling (e.g., Windows 125%, 150%) that changes effective PPI; this calculator uses the raw PPI you provide
- Retina displays use 2× or 3× pixel density — the logical resolution may differ from the physical pixel count
- This tool converts pixel dimensions to physical size; it does not resize or resample image files
Related Conversion Tools
If you need to convert physical measurements, try our mm to inches converter or our cm to feet calculator for standard metric-to-imperial conversions.