Aspect Ratio Calculator
Calculate aspect ratios, resize dimensions proportionally, and explore common presets like 16:9 and 4:3. Free online tool.
How to Use
- Enter a Width and Height to see the simplified aspect ratio.
- Click a preset button (16:9, 4:3, etc.) to quickly set common ratios.
- Use the Lock Ratio toggle to maintain the ratio when changing dimensions.
- The visual preview shows the shape of your aspect ratio.
Common Aspect Ratios
| Ratio | Use Case |
|---|---|
| 16:9 | Widescreen monitors, YouTube, HDTV |
| 4:3 | Classic TV, iPad, presentations |
| 21:9 | Ultrawide monitors, cinema |
| 1:1 | Instagram square posts |
| 9:16 | Mobile stories, TikTok, Reels |
| 3:2 | DSLR photography, MacBook displays |
Aspect Ratio in Web Design
Understanding aspect ratios is crucial for responsive design, video embeds, image cropping, and CSS aspect-ratio property. This calculator helps designers and developers quickly find the right dimensions for any target ratio.
FAQ
What is an aspect ratio?
An aspect ratio is the proportional relationship between width and height. For example, 16:9 means for every 16 units of width, there are 9 units of height.
How does the resize feature work?
Enter your current width and height to establish the ratio. Then change either dimension — the other will automatically adjust to maintain the same aspect ratio.
What are common aspect ratios?
16:9 (widescreen monitors, YouTube), 4:3 (classic TV, iPad), 21:9 (ultrawide monitors), 1:1 (Instagram square), 9:16 (mobile stories), 3:2 (DSLR photos).
Is my data sent anywhere?
No. All calculations run 100% in your browser. Nothing is sent to any server.