Aspect Ratio Calculator

Keeping Proportions When Resizing

An aspect ratio is the proportional relationship between width and height (e.g. 16:9). To resize an image or video without distortion, the new dimensions must keep that ratio: new height = new width × (original height ÷ original width). Enter your original size to see its simplified ratio, then type a new width to get the matching height. All math is done locally in your browser.