Aspect Ratio Chart
The ratios you will actually meet, in one table: the fraction form, the decimal form, and where each shape is used. Decimals are width ÷ height, rounded to four places.
| Ratio | Decimal | Used for |
|---|---|---|
| 1:1 | 1.0000 | Square posts, avatars, app icons |
| 5:4 | 1.2500 | 8×10 prints, some desktop monitors |
| 4:3 | 1.3333 | Classic TV, iPads, Micro Four Thirds cameras |
| 3:2 | 1.5000 | 35mm film, most DSLR/mirrorless sensors, 6×4 prints |
| 8:5 (16:10) | 1.6000 | Many laptop screens, design-friendly workspace |
| 5:3 | 1.6667 | Some phone screens, Super 16 film |
| 16:9 | 1.7778 | HD/4K video and TV, presentations |
| 37:20 (1.85:1) | 1.8500 | Mainstream cinema projection |
| 2:1 (18:9) | 2.0000 | Tall phone screens, panoramic banners |
| 7:3 ("21:9") | 2.3333 | The exact ratio behind the "21:9" name |
| 47:20 (2.35:1) | 2.3500 | Classic anamorphic widescreen |
| 239:100 (2.39:1) | 2.3900 | Modern anamorphic / scope cinema |
| 32:9 | 3.5556 | Super-ultrawide monitors (two 16:9 side by side) |
| 9:16 | 0.5625 | Vertical phone video — read the chart the other way up |
| 4:5 | 0.8000 | Portrait social posts |
| 2:3 | 0.6667 | Portrait prints and Pinterest pins |
Portrait ratios at the bottom are landscape shapes turned on their side — their decimal is simply the reciprocal.
The six with their own calculators
The ratios people compute with most often each have a dedicated page with a pre-filled tool and a table of common sizes: 16:9, 9:16, 4:3, 1:1, 21:9 and 4:5. For anything else, the main calculator simplifies and scales any pair of numbers.