PPI Calculator – Pixels Per Inch for Any Screen
Calculate pixels per inch (PPI) for any display resolution and screen size.
About This Calculator
Calculate pixels per inch (PPI) for any display resolution and screen size. Use the calculator above for instant results.
Worked Examples
- Diagonal pixels: 2935 | PPI: 108.8 | Good for desk use
Answer: 108.8 PPI
- PPI: 163.2 | High density — excellent clarity
Answer: 163.2 PPI
- PPI: 400.5 | Very high density — true Retina
Answer: 400.5 PPI
Who Uses This Calculator?
Compare display sharpness.
Evaluate screen sharpness.
Design for different pixel densities.
Quantify display quality.
Common Mistakes to Avoid
❌ PPI vs DPI
PPI = pixels per inch (screens). DPI = dots per inch (printers and mice). Not interchangeable.
❌ Retina threshold
Apple calls displays 'Retina' when PPI makes individual pixels imperceptible at typical viewing distance. For phones (~12"), ~300 PPI. For 27" monitors (~28"), ~100 PPI is sufficient.
Frequently Asked Questions
Good PPI for monitors?
21-27" at 1-3ft: 100-120 PPI is comfortable. 4K 27" (163 PPI) is excellent. Under 90 PPI may show pixelation.
Phone PPI?
Flagship phones: 400-570 PPI. Budget phones: 200-300 PPI. Above 300 PPI differences are barely visible.
PPI for print?
Print resolution is 300 DPI standard. Screen PPI and print DPI are different measurements — don't confuse them.