About this tool
The Aspect Ratio Calculator helps you resize videos, images and screens while keeping the correct proportions. Enter a known width or height and a target ratio (like 16:9, 4:3 or 1:1), and it computes the matching dimension instantly. It is essential for video editors, designers and developers preparing content for YouTube, Instagram, TikTok and websites without distortion.
How to use
- 1Pick a ratio or enter a custom one.
- 2Type a known width or height.
- 3Read the calculated dimension.
Benefits
- Common presets (16:9, 4:3, 1:1, 21:9).
- Custom ratios supported.
- Instant, no distortion.
Frequently asked questions
What is 16:9?+
It is the standard widescreen ratio used by YouTube and most modern videos and screens.
Can I use a custom ratio?+
Yes. Enter any width:height ratio and the tool keeps your dimensions proportional.