Common Aspect Ratios
Aspect Ratio Calculator
Calculate the aspect ratio from width and height, or find the missing dimension when scaling to a specific ratio. Useful for resizing images, videos, screen layouts, and print designs while maintaining proportions.
FAQ
Q: What is an aspect ratio?
A: An aspect ratio is the proportional relationship between the width and height of a rectangle, expressed as W:H. For example, a 1920×1080 image has an aspect ratio of 16:9, meaning it is 16 units wide for every 9 units tall.
Q: How do I scale dimensions while keeping the aspect ratio?
A: Use the "Scale Size" tab. Enter the ratio (e.g. 16:9) and one known dimension. The calculator will compute the missing dimension so the proportions are preserved.
Q: What are the most common aspect ratios?
A: 16:9 is standard for HD video and modern monitors. 4:3 was used for older TVs and monitors. 1:1 is square, common in social media. 21:9 (ultrawide) is used for cinema and ultrawide monitors. 3:2 is common in photography (35mm film).