Ratio Calculator

Free online ratio calculator to calculate ratios, proportions, and aspect ratios. Find missing values in ratios and solve proportion problems with step-by-step calculation.

Ratio Calculator

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* Enter ratio or screen resolution.

Finds the missing value in a set of ratios

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* Provide any three values to calculate the ratio A:B = C:?. E.g 16:9, 3:?.

What is Ratio?

A ratio is a quantitative relationship or comparison between two or more quantities. It expresses how many times one value contains or is contained within another value. Ratios are often used to describe proportions, relationships, or comparisons between different elements or parts of a whole.

In a ratio, you typically have two numbers separated by a colon (e.g., 2:1) or expressed as a fraction (e.g., 1/2). These numbers can represent various things, such as lengths, quantities, amounts, or any other measurable values.

For example, if you have a bag containing 20 red marbles and 10 blue marbles, the ratio of red marbles to blue marbles is 20:10 or 2:1, which means there are two times as many red marbles as there are blue marbles.

Ratios are used in various fields, including mathematics, science, finance, and everyday life, to describe relationships, make comparisons, and solve problems involving proportions and relative quantities.

What is Aspect Ratio?

Aspect ratio is a mathematical ratio that describes the relationship between the width and height of an image or screen. It represents the proportion between the width and height in the form of a fraction or decimal number. Aspect ratio is an important concept in images, videos, and graphic design because it influences how we display and view content on a screen.

For example, in a screen with a 16:9 aspect ratio, it means that the width of the screen is 16 units, and the height is 9 units. This can be expressed using a fraction (16/9) or a decimal number (1.77) to describe this ratio.

Different aspect ratios are suitable for different applications and purposes. For instance, the 4:3 aspect ratio is commonly used in classic televisions and computer monitors, while the 16:9 aspect ratio is often used in HD and Full HD screens. Aspect ratio also determines how we experience various forms of media, such as watching movies in theaters or on TV.

Popular aspect ratios and sizes of videos and Screens

Name Aspect ratio Width (pixel) Height (pixel)
480p 3:2 720 480
576p 5:4 720 576
720p 16:9 1280 720
1080p 16:9 1920 1080
2160p (4K UHD) 16:9 3840 2160
4320p (8K UHD) 16:9 7680 4320
8640p 16:9 15360 8640
SVGA 4:3 800 600
WSVGA ~17:10 1024 600
XGA 4:3 1024 768
XGA+ 4:3 1152 864
WXGA 16:9 1280 720
WXGA 5:3 1280 768
WXGA 16:10 1280 800
SXGA (UVGA) 4:3 1280 960
SXGA 5:4 1280 1024
HD ~16:9 1360 768
HD ~16:9 1366 768
SXGA+ 4:3 1400 1050
WXGA+ 16:10 1440 900
HD+ 16:9 1600 900
UXGA 4:3 1600 1200
WSXGA+ 16:10 1680 1050
FHD 16:9 1920 1080
WUXGA 16:10 1920 1200
QWXGA 16:9 2048 1152
WQHD 16:9 2560 1440
WQXGA 16:10 2560 1600