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On most Android smartphones, it is 16:9. Two more terms you need to know: Portrait mode and Landscape mode. Portrait mode is when you are holding the tablet in a way where it is longest from top to bottom; landscape mode is when you are holding the tablet in a way where it longest from left to right.
16:9 standard aspect ratio.
Widescreen 16:9 is the aspect ratio that is suitable in most situations. This size displays well on the screens of most smartphones, laptops, and tablet devices, and it's also the ratio we watch TV shows in. Most new smartphones also automatically record videos on widescreen (if you hold the phone horizontally).
-16:9 is the standard ratio but nowadays we are also getting phones with an aspect ratio of 18:9 & 19:9, which reduces the width but increases the height thus making it easier to hold. – The great design of the Smartphone feels good in your hands and comes with some drawbacks too.
In case anyone wanted more of a visual reference:
Decimal approximations reference table:
╔══════════════════════════╦════════════════════════╦════════════════════════╗
║ aspect ratio ║ decimal approx. ║ decimal approx. ║
║ [long edge x short edge] ║ [short edge/long edge] ║ [long edge/short edge] ║
╠══════════════════════════╬════════════════════════╬════════════════════════╣
║ 19.5 x 9 ║ 0.462... ║ 2.167... ║
╠══════════════════════════╬════════════════════════╬════════════════════════╣
║ 19 x 9 ║ 0.474... ║ 2.11... ║
╠══════════════════════════╬════════════════════════╬════════════════════════╣
║ ~18.7 x 9 ║ 0.482... ║ 2.074... ║
╠══════════════════════════╬════════════════════════╬════════════════════════╣
║ 18.5 x 9 ║ 0.486... ║ 2.056... ║
╠══════════════════════════╬════════════════════════╬════════════════════════╣
║ 18 x 9 ║ 0.5 ║ 2 ║
╠══════════════════════════╬════════════════════════╬════════════════════════╣
║ 19 x 10 ║ 0.526... ║ 1.9 ║
╠══════════════════════════╬════════════════════════╬════════════════════════╣
║ 16 x 9 ║ 0.5625 ║ 1.778... ║
╠══════════════════════════╬════════════════════════╬════════════════════════╣
║ 5 x 3 ║ 0.6 ║ 1.667... ║
╠══════════════════════════╬════════════════════════╬════════════════════════╣
║ 16 x 10 ║ 0.625 ║ 1.6 ║
╠══════════════════════════╬════════════════════════╬════════════════════════╣
║ 3 x 2 ║ 0.667... ║ 1.5 ║
╠══════════════════════════╬════════════════════════╬════════════════════════╣
║ 4 x 3 ║ 0.75 ║ 1.333... ║
╚══════════════════════════╩════════════════════════╩════════════════════════╝
Changelog:
56x27 === ~18.7x9 (Huawei P20), 19x9 (Nokia X6 2018) and 19.5x9 (LG G7 ThinQ)19x10 (Essential Phone)18.5x9 (Samsung Galaxy S8) and 18x9 (LG G6)I researched the same thing several months ago looking at dozens of the most popular Android devices. I found that every Android device had one of the following aspect ratios (from most square to most rectangular):
And if you consider portrait devices separate from landscape devices you'll also find the inverse of those ratios (3:4, 2:3, 5:8, 3:5, and 9:16)
More complete answer here: stackoverflow community spreadsheet of Android device resolutions and DPIs
It is safe to assume that popular handsets are WVGA800 or bigger. Although, there are a good amount of HVGA screens, they are of secondary concern.
List of android screen sizes
http://developer.android.com/guide/practices/screens_support.html
Aspect ratio calculator
http://andrew.hedges.name/experiments/aspect_ratio/
the best way to calculate the equation is simplified. That is, find the maximum divisor between two numbers and divide:
ex.
1920:1080 maximum common divisor 120 = 16:9
1024:768 maximum common divisor 256 = 4:3
1280:768 maximum common divisor 256 = 5:3
may happen also some approaches
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