What are the aspect ratios for all Android phone and tablet devices?

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:

• May 2018: Added 56x27 === ~18.7x9 (Huawei P20), 19x9 (Nokia X6 2018) and 19.5x9 (LG G7 ThinQ)
• May 2017: Added 19x10 (Essential Phone)
• March 2017: Added 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):

• 4:3
• 3:2
• 8:5
• 5:3
• 16:9

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/