Aspect Ratio Calculator
Calculate aspect ratios, resize dimensions proportionally, and find equivalent resolutions for screens, images, and video.
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Enter width and height above
Resize Proportionally
About Aspect Ratios
An aspect ratio describes the proportional relationship between an image's width and height. It is usually expressed as two numbers separated by a colon, such as 16:9 or 4:3. Aspect ratios are essential in photography, videography, web design, and display manufacturing. Keeping the correct ratio when resizing ensures your content is not stretched or distorted. Common ratios include 16:9 for widescreen monitors and TVs, 4:3 for older displays, 1:1 for social media squares, and 9:16 for vertical mobile video.
FAQ
What is an aspect ratio?
An aspect ratio is the ratio of width to height of a rectangle, typically a screen, image, or video frame. It is written as two numbers separated by a colon (e.g., 16:9). The ratio is simplified using the greatest common divisor so that the numbers are as small as possible.
What are the most common screen aspect ratios?
The most common aspect ratios are 16:9 (widescreen, used by most monitors and TVs), 4:3 (classic TV and older monitors), 21:9 (ultrawide monitors), 1:1 (square, popular on social media), 9:16 (vertical video for mobile), and 3:2 (used in many laptops and cameras).
What aspect ratio is 1920x1080?
1920x1080 is a 16:9 aspect ratio. This is the standard Full HD resolution used by most modern monitors, TVs, and video content. Other 16:9 resolutions include 1280x720 (HD), 2560x1440 (QHD), and 3840x2160 (4K UHD).
How do I resize an image without distortion?
To resize without distortion, you must maintain the original aspect ratio. Change one dimension (width or height) and calculate the other proportionally. For example, if an image is 1920x1080 (16:9) and you set the new width to 1280, the new height should be 1280 / (16/9) = 720. This calculator handles that math automatically.