PPI Calculator (Screen Resolution to Pixel Density)
Enter a screen's diagonal size (in inches) and its resolution to calculate the PPI (pixels per inch). Also shows how large the image would print at 150 DPI and 300 DPI.
Recommended DPI for Printing
| Purpose | Recommended DPI |
|---|---|
| Web / Monitor Display | 72–96 DPI |
| General Printing (Flyers, etc.) | 150 DPI |
| High-Quality Printing (Photos, Magazines) | 300 DPI |
| Professional Printing (Fine Art) | 600 DPI or higher |
Results are provided for reference only and may differ from actual values.
Understanding Screen Pixel Density (PPI)
Why PPI matters when choosing a monitor or phone
PPI determines how sharp text and images appear. Beyond roughly 300 PPI, pixels become indistinguishable to the human eye at normal viewing distances — this is the origin of Apple's "Retina" marketing term. The threshold changes with distance: a TV watched from 3 meters needs far less PPI than a phone held 30 cm away.
Typical PPI values for everyday devices
- 27" 1080p monitor: 82 PPI — pixels visible if you sit close
- 27" 1440p (QHD) monitor: 109 PPI — balanced for productivity
- 27" 4K monitor: 163 PPI — sharp, ideal for design work
- 13" MacBook Air Retina: 227 PPI
- iPhone 15 Pro: 460 PPI
- Samsung Galaxy S24 Ultra: 505 PPI
- 55" 4K TV: 80 PPI — fine at 2m+ viewing distance
- 85" 8K TV: 104 PPI
Choosing the right resolution for your screen size
Higher resolution doesn't always mean better viewing experience — it depends on size.
- 24" monitor: 1080p is fine (92 PPI); 1440p is luxurious
- 27" monitor: 1440p is the sweet spot; 1080p looks grainy
- 32" monitor: 4K is recommended; 1440p is acceptable at 92 PPI
- 34" ultrawide: 3440×1440 delivers ~110 PPI, very sharp
- Laptop 13": 1080p minimum; Retina/2K looks dramatically better
Print vs screen — why DPI recommendations differ
Print DPI values (150, 300, 600) are far higher than screen PPI because printed dots use ink scattering and halftone patterns — multiple dots combine to simulate colors. A 300 DPI printed page actually has fewer "perceived pixels" per inch than it looks. Meanwhile, a screen directly emits light from each pixel, so 163 PPI on a 4K monitor can look as detailed as 300 DPI print from a viewing distance of 50 cm+.
Practical tip — testing your own PPI
Enter your monitor's diagonal size in inches and native resolution to see its actual PPI. If the result is below 100, you may benefit from a higher-resolution replacement. Above 200 PPI is noticeably sharp for text and photo editing.
Frequently Asked Questions
Q. What is the difference between PPI and DPI?
PPI (Pixels Per Inch) refers to the pixel density of a screen, while DPI (Dots Per Inch) refers to the dot density in printed output. Displays use PPI; printers use DPI.
Q. What DPI is recommended for printing?
150 DPI for general flyers, 300 DPI for photo prints and magazines, and 600 DPI or higher for professional fine-art printing.
Q. How do I calculate PPI?
PPI = diagonal pixels ÷ diagonal inches. Diagonal pixels = √(width² + height²). For a 27-inch 2560×1440 monitor: √(2560² + 1440²) ÷ 27 ≈ 109 PPI.
Q. What is a good PPI for a monitor?
100–130 PPI is balanced for productivity. Below 90 PPI (27-inch 1080p) shows visible pixels; above 160 PPI (27-inch 4K) looks extremely sharp but needs OS display scaling.
Q. Why do phones have PPI over 400?
Phones are viewed at 25–35 cm, much closer than monitors (50–70 cm) or TVs (2–3 m). Closer distance requires higher PPI to look sharp. Apple's "Retina" starts around 326 PPI for phones.
Q. Does higher PPI always mean better image quality?
Only up to a point. Once PPI exceeds what the eye can resolve at a given distance, extra pixels provide no visible benefit. A 50-inch 4K TV at 2.5 m distance shows no improvement over 1440p.
Related Tools
Results are provided for reference only and may differ from actual values. This tool is for informational purposes and should not be used as a basis for legal, financial, or medical decisions.