A graphic to better understand video resolutions with a 16:9 ratio. These are all divisible by 8, meaning they will all scale up to size and fully fit without cropping.
- 7680×4320 8K
- 5632×3168 6K
- 3840×2160 4K
- 2560×1550 QHD
- 1920×1080 FHD
- 1280×720 HD
- 1024×576 SD
- 640×360
The lower and well-used resolutions have names to reference them, such as UDH (Ultra High Definition) for 4k and FHD (Full High Definition) for 1080p.