Classic 1.33:1 aspect ratio cheat sheet with resolutions for most popular container sizes, from Standard HD 720p and Full HD 1080p through 4K and all the way up to 8K video.

Aspect ratio is the relationship between the width and height of the image displayed on screen. It is generally expressed as two numbers separated by a colon, width:height.

The 1.33:1 aspect ratio, also known as 4:3 aspect ratio, is one of the earliest and most iconic aspect ratios in the history of film. The picture width is 1.33 times the height (or 4 units of width for every 3 units of height).

1.33:1 was the aspect ratio used for 35 mm films in the silent era of the late 19th and early 20th centuries. It is very close to the 1.375:1 (abbreviated as 1.37:1) Academy ratio, defined by the Academy of Motion Picture Arts and Sciences as a standard after the advent of sound in film.

1.33:1 was also the first aspect ratio for television sets and most early computer monitors. The ratio was therefore considered "fullscreen" as it fit the entire screen of a standard television set or monitor at the time. For the most part, 4:3 aspect ratio resolution typically refers to TV screens and monitors, and the more technical 1.33:1 is used in the context of film and television productions.

While wider aspect ratios like 16:9 and 2.35:1 have become more common, the 1.33 aspect ratio has made a comeback in recent years. Filmmakers like Wes Anderson, Paul Schrader and Zack Snyder have used it in their films to evoke a sense of nostalgia, pay homage to classic cinema, or simply as an aesthetic choice.

These are the most common 1.33:1 aspect ratio resolutions:

8K = 6144x4608
8K UHD = 5760x4320
6K = 4608x3456
5K = 3840x2880
4K = 3072x2304
4K UHD = 2880x2160
3K = 2304x1728
3K UHD = 2160x1620
2K = 1536x1152
Full HD 1080p = 1440x1080
HD 720p = 960x720

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