Aspect Ratio Calculator
Find the aspect ratio of any width and height, and work out the size that keeps a ratio such as 16:9. Free.
Find the ratio
- Aspect ratio
- 16:9
- As a number
- 1.778:1
- Common ratio
- 16:9 · HD video, YouTube
Keep a ratio
1280 × 720
Common ratios
Aspect Ratio Calculator simplifies any width and height to its ratio, such as 1920 × 1080 to 16:9, and names the common ratio it matches: video, phone, photo print or social media. To resize while keeping a ratio, enter the ratio and one side to get the other. A list of common ratios, from 1:1 to 21:9 and 9:16 for Stories, fills them in with one click.
How to use Aspect Ratio Calculator
- 1
Enter a size
Type the width and height to get the ratio.
- 2
Or keep a ratio
Enter a ratio and one side to get the other.
- 3
Use a common ratio
Pick 16:9, 4:5, 9:16 and others from the list.
What it does
- Simplest ratio
- 1920 × 1080 becomes 16:9, with the decimal value.
- Named ratios
- Matches it to video, phone, print and social sizes.
- Missing side
- Works out the width or height that keeps the ratio.
Questions
What is 16:9 in pixels?
Common 16:9 sizes are 1280 × 720, 1920 × 1080 and 3840 × 2160. Enter any width to get its 16:9 height.
Which ratio for Instagram?
1:1 for square posts, 4:5 for portrait posts and 9:16 for Stories and Reels.
Why isn't my screen exactly 16:9?
Some sizes are close but not exact, such as 1366 × 768. The tool shows the nearest common ratio and marks it as approximate.
Does it need an internet connection?
Only to open the page. Everything is calculated on your device, and nothing you type is sent anywhere.