Aspect ratio calculator
Reduce a resolution to its simplest ratio using the greatest common divisor, and see which of the common device shapes it is closest to.
Resolution
portrait
Result
- Simplified ratio
- 9:20
- Decimal (long ÷ short)
- 2.2222
- Orientation
- portrait
- Closest common ratio
- 20:9 — Modern Android phone
Reading phone aspect ratios
Phone ratios have stretched steadily: 16:9 was standard until 2017, then 18:9 arrived with the first tall phones, and most modern Android devices sit between 19.5:9 and 20:9. Sony has stayed at 21:9 for several generations, which is why Xperia screenshots look dramatically taller than other Android phones at the same physical size.
The ratio affects layout more than density does. A 21:9 viewport gives you far more dp of height at the same width, so vertically centred content drifts and sticky headers reveal more or less of the page depending on the device. Foldables are the opposite extreme: their inner displays are close to square, which breaks any layout that assumes width is always much smaller than height.
The simplified ratio uses the greatest common divisor of the two dimensions, so 1080×2400 reduces to 9:20 rather than the 20:9 you will see quoted in marketing material. Both describe the same panel; the site reports it with the short edge first to stay consistent when comparing portrait and landscape.