Aspect Ratio Calculator Documentation

Calculate a missing width or height from a known aspect ratio, or find the ratio between two dimensions.

SiteIndex scales a known width or height using your target ratio to calculate the missing dimension, and can also reduce two dimensions to their simplest whole-number ratio.

• Find the correct height for a banner at a fixed width and ratio.
• Check whether an image matches a common ratio like 16:9 or 4:3.
• Resize a design proportionally without distorting it.

Input

Text, files, or values entered in the browser, depending on the tool.

Output

A result shown in the browser that can be reviewed or copied where supported.

• Dimension calculation alone does not crop, resample, or change an image file. Pixel rounding can slightly change the represented ratio.

Inputs for this browser-side tool are processed locally and are not sent to SiteIndex. Normal page analytics may still be collected as described in the Privacy Policy. Read the Privacy Policy.