What is Aspect Ratio Calculator Online?
Aspect ratio is the proportional relationship between width and height (width:height). Common ratios: 16:9 (HD video), 4:3 (traditional TV), 1:1 (square/Instagram), 21:9 (ultrawide). Calculates missing dimensions and converts between ratios.
How to Use Aspect Ratio Calculator Online
- Enter any two known values (width, height, or ratio).
- The missing dimension is calculated instantly.
Frequently Asked Questions
Best aspect ratio for YouTube?
16:9 is YouTube's standard. Other ratios get letterboxed with black bars on top/bottom or sides.