Screen sizes in cm: phones, tablets, laptops and monitors
Every screen is sold by its diagonal in inches. Multiply by 2.54 for centimeters; to know the width and height you also need the aspect ratio, which differs between devices.
Phones (19.5:9)
Modern phones are tall and narrow: almost all use 19.5:9 or 20:9. The sizes are for the screen; the phone itself is usually 0.5–1 cm larger.
| Inches | Diagonal (cm) | Screen width × height (cm) |
|---|---|---|
| 5.5″ | 13.97 | 5.9 × 12.7 |
| 5.8″ | 14.73 | 6.2 × 13.4 |
| 6.1″ | 15.49 | 6.5 × 14.1 |
| 6.3″ | 16 | 6.7 × 14.5 |
| 6.5″ | 16.51 | 6.9 × 15 |
| 6.7″ | 17.02 | 7.1 × 15.5 |
| 6.8″ | 17.27 | 7.2 × 15.7 |
| 6.9″ | 17.53 | 7.3 × 15.9 |
Tablets (4:3)
Many tablets use 4:3, which is better for reading. Some Android tablets are 16:10: at the same diagonal the screen is wider and less tall.
| Inches | Diagonal (cm) | Screen width × height (cm) |
|---|---|---|
| 7.9″ | 20.07 | 16.1 × 12 |
| 8.3″ | 21.08 | 16.9 × 12.6 |
| 10.2″ | 25.91 | 20.7 × 15.5 |
| 10.9″ | 27.69 | 22.1 × 16.6 |
| 11″ | 27.94 | 22.4 × 16.8 |
| 12.9″ | 32.77 | 26.2 × 19.7 |
Laptops (16:9 and 16:10)
A laptop is sold by its screen diagonal, but the body is a few centimeters wider. To choose a bag or a sleeve, check the outer dimensions in the spec sheet.
| Inches | Diagonal (cm) | 16:9 screen (cm) | 16:10 screen (cm) |
|---|---|---|---|
| 11.6″ | 29.46 | 25.7 × 14.4 | 25 × 15.6 |
| 13.3″ | 33.78 | 29.4 × 16.6 | 28.6 × 17.9 |
| 14″ | 35.56 | 31 × 17.4 | 30.2 × 18.8 |
| 15.6″ | 39.62 | 34.5 × 19.4 | 33.6 × 21 |
| 16″ | 40.64 | 35.4 × 19.9 | 34.5 × 21.5 |
| 17.3″ | 43.94 | 38.3 × 21.5 | 37.3 × 23.3 |
Monitors (16:9 and ultrawide 21:9)
A 34-inch ultrawide (21:9) is much wider and less tall than a 32-inch 16:9 monitor, even though the diagonals are almost the same.
| Inches | Aspect ratio | Diagonal (cm) | Width × height (cm) |
|---|---|---|---|
| 21.5″ | 16:9 | 54.61 | 47.6 × 26.8 |
| 23.8″ | 16:9 | 60.45 | 52.7 × 29.6 |
| 24″ | 16:9 | 60.96 | 53.1 × 29.9 |
| 27″ | 16:9 | 68.58 | 59.8 × 33.6 |
| 32″ | 16:9 | 81.28 | 70.8 × 39.8 |
| 34″ | 21:9 | 86.36 | 79.4 × 34 |
| 49″ | 32:9 | 124.46 | 119.8 × 33.7 |
Why screens with the same diagonal differ
The diagonal is not everything. At the same diagonal, a longer, narrower shape gives a smaller screen area: a 6.7-inch phone (19.5:9) is about 7.1 cm wide, a 7.9-inch tablet (4:3) about 16 cm.
The general formula for an a:b screen: width = diagonal × a ÷ √(a² + b²), height = diagonal × b ÷ √(a² + b²).
Frequently asked questions
How many cm is a 6.7-inch screen?
17.02 cm diagonally; at 19.5:9 about 7.1 × 15.5 cm.
How big is a 15.6-inch laptop in cm?
The screen is 39.62 cm diagonally (34.5 × 19.4 cm at 16:9); the body is usually about 36 cm wide.
How wide is a 27-inch monitor?
About 59.8 cm (23.5 in) of screen at 16:9, and 33.6 cm tall.
More size guides
TV sizes in cm: width and height chart · Jeans sizes in cm: waist (W) and length (L) · Fractions of an inch to millimeters
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