Aspect Ratio Calculator

How this is worked out

The width and height are divided by their greatest common divisor to give the simplest whole-number ratio, with the decimal ratio alongside.

Worked example

Assumptions and limits

• Dimensions are rounded to whole numbers before simplifying.
• Awkward pixel counts can produce an unhelpful exact ratio such as 683:384, which is correct but not a recognised standard.
• Assumes square pixels, which is true of essentially all modern displays.