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Screen Resolution, PPI & Aspect Ratio Calculator
Calculate pixels per inch (PPI), aspect ratio, and total pixel count from screen resolution and size.
In this article
PPI
PPI = √(W²+H²) / diagonal। iPhone: ~460 PPI। Laptop 14": ~250। TV 55" 4K: ~80। Above 300 PPI: pixels invisible at normal distance। Indian smartphone market: Redmi, Samsung, Realme dominate।
When Matters
Phone/tablet: 300+ PPI important। Monitor at arm length: 100-120 fine। TV at 3m: 60-80 fine।
⚡ CalcWolf Insight
The human eye can perceive approximately 300 PPI at 12 inches viewing distance — this is why Apple chose 326 PPI for the original Retina iPhone. At typical desktop viewing distances (24-30 inches), the equivalent is about 100-120 PPI. Buying a 5K monitor for a desktop you sit 3 feet from provides diminishing returns beyond bragging rights.
Frequently asked questions
Good PPI?▾
Phone: 300+। Laptop: 200+। TV: 60-80 (viewing distance compensates)।
4K vs 1080p TV?▾
55" at 3m: minimal visible difference। 65" at 2.5m: 4K noticeably better।
✓ Math logic verified against primary sources
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