Resolution calculator
| Name | Pixels | Ratio | Megapixels |
|---|---|---|---|
| HD | 1280 × 720 | 16 : 9 | 0.92 |
| Full HD | 1920 × 1080 | 16 : 9 | 2.07 |
| WUXGA | 1920 × 1200 | 16 : 10 | 2.30 |
| QHD / 1440p | 2560 × 1440 | 16 : 9 | 3.69 |
| UWQHD | 3440 × 1440 | 21 : 9 | 4.95 |
| 4K UHD | 3840 × 2160 | 16 : 9 | 8.29 |
| DCI 4K | 4096 × 2160 | 17 : 9 | 8.85 |
| 5K | 5120 × 2880 | 16 : 9 | 14.75 |
| 8K UHD | 7680 × 4320 | 16 : 9 | 33.18 |
Aspect ratio is width and height reduced by their greatest common divisor. 3440 × 1440 reduces to 43:18, usually marketed as 21:9. Total pixels are simply width times height. 4.95 megapixels in that case.
How to work with resolutions
Several advertised ratios are approximations. "21:9" ultrawide is actually 43:18 at 3440×1440 and 64:27 at 2560×1080; neither is 21:9, which would be 2.333 rather than 2.389. DCI 4K at 4096×2160 is 17:9, not 16:9, which is why cinema 4K and television 4K are different resolutions with the same name. The reduced ratio shown here is the true one, which occasionally disagrees with the box.
Questions
Mathematically 43:18. It is marketed as 21:9, which is an approximation.
8.29 for 3840 × 2160 UHD, or 8.85 for DCI 4K at 4096 × 2160.
In pixel count, yes: twice the width and twice the height gives four times the pixels.
An older monitor ratio, still used on some laptops because the extra vertical space suits documents and code.
Multiply the known one by the ratio. For 16:9 from a 1920 width, the height is 1920 × 9 ÷ 16 = 1080.