Common Screen Sizes
| Diagonal | Ratio | Width × Height (in) |
|---|---|---|
| 13.3" | 16:10 | 11.3 × 7.1 |
| 15.6" | 16:9 | 13.6 × 7.6 |
| 24" | 16:9 | 20.9 × 11.8 |
| 27" | 16:9 | 23.5 × 13.2 |
| 32" | 16:9 | 27.9 × 15.7 |
| 55" | 16:9 | 47.9 × 27.0 |
Screen Size Calculator
Calculate physical screen dimensions (width and height in inches) from diagonal size and aspect ratio.
📐 How We Calculate — Learn about our calculation methodology, data sources, and quality standards.
Frequently Asked Questions
Why is screen size measured diagonally?
It is a convention from CRT TV days when tubes were round. Diagonal measurement is simpler than listing width and height separately, and it stuck.
Does a bigger screen mean better?
Not necessarily. PPI matters more than size. A 27" 4K monitor (163 PPI) is sharper than a 55" 4K TV (80 PPI) at the same viewing distance.
How to Use This Screen Size Calculator
Enter any two of: diagonal size, width, height, or aspect ratio. The calculator determines screen dimensions in inches or centimeters.
Formula & How It Works
Diagonal = √(Width² + Height²). For a given diagonal and aspect ratio (w:h): Width = Diagonal × w / √(w² + h²). Height = Diagonal × h / √(w² + h²).
Calculation Example
A 27" monitor at 16:9: Width = 23.5", Height = 13.2". A 65" TV at 16:9: Width = 56.7", Height = 31.9".
Expert Tips
Viewing distance: 1.5-2.5× the diagonal for TVs. For desk monitors: 24-27" at arm's length. Ultrawide (21:9) monitors are great for productivity — equivalent to two smaller screens side by side.