Aspect Ratio Calculator
Find the ratio of a size, or keep a ratio and work out the missing width or height when resizing.
Ratio of a size
Resize keeping the ratio
Change either value and the other one follows.
Common aspect ratios
- 16:9: HD and 4K TVs, most monitors and YouTube (1920 x 1080, 3840 x 2160).
- 4:3: older monitors, iPads and many photos.
- 21:9: ultrawide monitors and cinema.
- 3:2: DSLR photos and some laptops.
- 9:16: vertical phone video for stories, Reels, Shorts and TikTok.