Aspect Ratio Calculator

Enter an original size to get its simplified ratio, then resize by width or height while keeping the same proportions. Great for images, video and design.

Fast, browser-based tool — no installation required

Free

Original image width in pixels×Original image height in pixels= 16:9

New image width in pixels×New image height in pixels

New size: 1280 × 720 px(16:9)

Size change from original: 67%

Original image area: 2073600 px

New image area: 921600 px

Runs entirely in your browser — nothing is uploaded.