Ratio Calculator
Please provide any three values below to calculate the fourth in the ratio A:B = C:D.
Ratio Scaling Calculator
What is Ratio?
A ratio tells you how many times one amount contains another. The concept shows up in everyday life and is pretty straightforward. Picture a child receiving only half as many cookies as his sister. He may not be able to state the math, but his obvious complaint will reveal that he senses the distribution as a 1:2 split.
Usually a ratio is written with two numbers separated by a colon, like "1:2", or spoken as "one to two". It can also appear as the fraction ½. The ratio indicates the factor you must multiply the denominator by to reach the numerator – in this case, multiplying 2 by ½ gives 1. The relationship becomes clearer when the first number is larger, e.g., 2:1 means two contains one twice. Ratios may also involve more than two terms.
We meet ratios in countless daily situations: screen aspect ratios, scaled maps and models, recipes, probability calculations, and financial rates. For instance, if someone plans to bake five cakes and each cake calls for a butter‑sugar‑flour proportion of 1:2:3, the total amounts are easy to work out. Multiplying the base ratio by five gives 5:10:15, which can then be converted into the actual weights of butter, sugar, and flour needed for the batch.
Typical Aspect Ratios and Sizes of Screens and Videos
An aspect ratio compares the dimensions of a shape in different directions. For a rectangle it is simply the width divided by the height. While aspect ratios are useful for tire specifications, paper standards, and photographic prints, they are most commonly discussed in the context of computer monitors, smartphones, and video formats. Below you will find a table of typical screen and video resolutions together with their corresponding aspect ratios.
| 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 |