Aspect Ratio Calculator

Aspect ratio

Calculate the other dimension while keeping the original aspect ratio.

Rounding to whole pixels can cause a very small deviation.

An aspect ratio describes the proportional relationship between width and height.

Different image, video, screen, or slide dimensions can share the same aspect ratio.

Enter width and height as positive whole numbers in the same unit, such as pixels.
Calculate the simplified ratio, orientation, and decimal value.
Enter a new width or height in the resize section to determine the matching other dimension.

Check formats for images, videos, monitors, presentations, and social media assets.
Calculate matching dimensions for thumbnails, embeds, and responsive layouts.
Change one dimension without stretching or squashing the content.

An aspect ratio has no unit; width and height only need to use the same unit.
The rounded pixel result can differ slightly from the exact decimal value.
The preview represents the shape of the ratio, not the actual physical or pixel size.

Why do 1920 × 1080 and 1280 × 720 both equal 16:9?

Each pair can be divided by its greatest common divisor to obtain 16:9. The sizes differ, but the proportion is identical.