Free Tool
Aspect Ratio Calculator
Find the aspect ratio of any dimensions, or calculate a missing width or height while maintaining ratio.
Enter width and height above
Common Aspect Ratios
- 16:9 — HD/4K video, YouTube, most monitors, TV screens
- 4:3 — Traditional TV, older computer monitors
- 1:1 — Instagram square, profile pictures
- 9:16 — TikTok, Instagram Stories, Reels (vertical video)
- 21:9 — Ultrawide monitor, cinematic format
- 3:2 — DSLR camera sensor, 35mm film
- 4:5 — Instagram portrait posts
How to Use
- Find Ratio: Enter any width × height to get the simplified ratio, decimal value, and inverse.
- Scale by Ratio: Enter a target ratio (e.g. 16:9) and one dimension to calculate the other. Useful for resizing images while keeping proportions.