Simplify a width and height to a clean ratio, or solve a missing dimension from a ratio.
16:9
Fill the ratio and ONE dimension — leave the other blank (or edit one and the other updates).
What is an aspect ratio calculator? An aspect ratio calculator turns a width and height into a simplified ratio like 16:9, or works out a missing side when you know the ratio and one dimension.
Enter a width and a height and it divides both by their greatest common divisor to give the simplified ratio. For example, 1920 by 1080 simplifies to 16:9. You can also enter a ratio and one dimension to solve the other. Everything runs in your browser.
In the solve section, type a ratio such as 16:9 and fill in one dimension. The calculator works out the matching side. For example, a 16:9 ratio with a width of 1280 gives a height of 720.
An aspect ratio is the proportional relationship between width and height, written as two numbers like 16:9. It describes the shape of an image, screen, or video regardless of its actual size.