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✦ Free Online Tool
FREE ASPECT RATIO CALCULATOR
Calculate aspect ratio from width and height. Find missing dimension from aspect ratio. Free aspect ratio calculator, no signup.
Find Aspect Ratio
Calculate Dimensions
Common Aspect Ratios
- 16:9 — YouTube, HD TV, most monitors
- 9:16 — TikTok, Instagram Reels, Stories
- 1:1 — Instagram square posts, profile pictures
- 4:3 — traditional TV, some cameras
- 21:9 — ultrawide monitors, cinema
Frequently Asked Questions
What is aspect ratio?+
The proportional relationship between width and height. 16:9 means for every 16 units wide, it is 9 units tall.
What is the most common aspect ratio?+
16:9 is the most common for videos, YouTube, and modern TVs.
Can I calculate missing dimensions?+
Yes. Switch to Calculate Dimensions mode, enter your ratio and one dimension.
Is it free?+
Yes, 100% free.