Aspect Ratio Calculator
Calculate and convert aspect ratios for images and videos
Calculate Ratio from Dimensions
:
Aspect Ratio
16:9
(1.778)
Calculate Dimension from Ratio
Calculated Dimension
1920 x 1080
Common Aspect Ratios
16:9
HD Video
4:3
Standard
21:9
Ultrawide
1:1
Square
3:2
Photo
9:16
Mobile
2:1
Univisium
5:4
SXGA
Frequently Asked Questions
What is aspect ratio?
Proportional relationship between width and height. Common: 16:9, 4:3, 1:1, 21:9.
Social media aspect ratios?
Instagram: 1:1 or 4:5. YouTube: 16:9. TikTok: 9:16. Facebook: 1.91:1.
Maintain ratio when resizing?
Enter one dimension and the tool calculates the other to maintain the ratio.
What is the standard aspect ratio for YouTube videos?
YouTube's standard aspect ratio is 16:9 (1920x1080 for full HD). YouTube Shorts use 9:16 (1080x1920). The player auto-adjusts for other ratios by adding letterboxing or pillarboxing.
How do I calculate the height if I know the width and aspect ratio?
Divide the width by the aspect ratio. For 16:9 at 1280px wide: height = 1280 / (16/9) = 720px. For 4:3 at 1024px wide: height = 1024 / (4/3) = 768px.
About Aspect Ratios
Aspect ratio is the proportional relationship between width and height of an image or video.
16:9 - Standard HD video format (1920x1080, 1280x720)
4:3 - Classic TV and monitor format
21:9 - Ultrawide cinema format
1:1 - Square format (Instagram posts)
9:16 - Vertical video (Stories, Reels, TikTok)