How to Use the Aspect Ratio Calculator
- Enter the width and height of your image, video, or container.
- Click Calculate to find the simplified aspect ratio.
- Use the ratio to resize your content while maintaining its proportions.
You can also enter an aspect ratio and one known dimension to calculate the missing dimension.
What Is an Aspect Ratio?
An aspect ratio describes the relationship between the width and height of an image, video, screen, or container.
For example, an image that is 1920 pixels wide and 1080 pixels high has an aspect ratio of 16:9.
- 1920 × 1080 → 16:9
- 1280 × 720 → 16:9
- 800 × 450 → 16:9
- 1080 × 1080 → 1:1
Common Aspect Ratios
| Aspect Ratio | Common Use |
|---|---|
| 1:1 | Square images and profile pictures |
| 4:3 | Traditional displays and images |
| 16:9 | HD video, monitors, and websites |
| 9:16 | Vertical video and mobile content |
| 3:2 | Photography |
| 21:9 | Ultrawide displays and video |
Calculate a Missing Dimension
When resizing an image or video, keeping the same aspect ratio prevents the content from appearing stretched or compressed.
For example, if you have a 16:9 aspect ratio and a width of 800 pixels, the matching height is:
800 × 9 ÷ 16 = 450 pixels
Therefore, the matching dimensions are 800 × 450 pixels.
Why Use an Aspect Ratio Calculator?
Maintaining the correct aspect ratio helps keep images and videos proportional when they are resized. This calculator is useful for:
- Images and photos
- Videos and thumbnails
- Website layouts
- Responsive containers
- Social media graphics
- Presentations and banners
- Screen and display dimensions
Enter your dimensions above to calculate your aspect ratio quickly and accurately.