Aspect Ratio Calculator
Calculate and convert aspect ratios for images, videos, and screens. Find the right dimensions for social media, print, and display.
Original Dimensions
Resize (Maintain Ratio)
Common Aspect Ratios
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Frequently Asked Questions
What is an aspect ratio?
An aspect ratio describes the proportional relationship between an image's width and height. For example, 16:9 means for every 16 units of width, there are 9 units of height. It's commonly used in video, photography, and display design to ensure content looks correct across different sizes.
What aspect ratio is best for YouTube videos?
YouTube recommends 16:9 (1920×1080 for Full HD, 3840×2160 for 4K). YouTube Shorts use 9:16 (1080×1920). Using the correct aspect ratio prevents black bars and ensures your video fills the player.
How do I resize an image without distortion?
Maintain the same aspect ratio when resizing. Enter your original dimensions above, then use the resize section to calculate the matching height or width. As long as the ratio stays the same (e.g., 16:9), the image won't stretch or squish.
What's the difference between 16:9 and 4:3?
16:9 is the modern widescreen standard used by HDTVs, monitors, and most video platforms. 4:3 is the older standard (classic TV shape). 16:9 is wider and more cinematic, while 4:3 is more square-shaped. Most content today uses 16:9.