Find ratio and equivalent dimensions.. Aspect Ratio Calculator is a free online tool from the ToolsRift Finance & Health Calculators collection. It runs entirely in your browser — nothing to install, no signup, and your data never leaves your device.
Enter a width and height to see the simplified aspect ratio, or enter one new dimension to get the matching value that preserves the ratio.
Aspect ratio is width divided by height, simplified to whole numbers using the greatest common divisor. 1920×1080 simplifies to a 16:9 ratio.
Enter the original width and height plus one new dimension, and the calculator finds the other so the image or video is not stretched or squashed.
16:9 for widescreen video, 4:3 for older displays, 1:1 for square social posts, and 21:9 for ultrawide. Photos often use 3:2 or 4:3.