Free Aspect Ratio Calculator
Enter a width and height to find the aspect ratio, or lock a ratio and calculate the missing dimension. Supports common presets like 16:9, 4:3, and 1:1.
Resize Without Distortion
Stretching an image to the wrong dimensions ruins its appearance. This calculator ensures you always maintain the correct proportions, whether you are preparing assets for a website, social media, or video project.
Frequently Asked Questions
An aspect ratio is the proportional relationship between width and height. For example, 16:9 means for every 16 units of width there are 9 units of height.
Enter one dimension (width or height) and the desired aspect ratio. The calculator gives you the other dimension that maintains the correct proportions.
16:9 is standard for HD video and monitors. 4:3 is the classic TV format. 1:1 is square, commonly used for social media profile images. 9:16 is vertical video for stories and reels.