Ratio Calculator
Calculate the missing value in the ratio A:B = C:D
Ratio Scaling Calculator
What is Ratio and How is it Calculated?
A ratio is a mathematical expression that compares two numbers, indicating how many times the first number contains the second. Ratios can be written in several forms, such as “a to b” or “a:b” or as a fraction a/b. Ratios are useful for comparing quantities and are widely used in various fields such as finance, cooking, and engineering.
To calculate a ratio, divide the two numbers by their greatest common divisor (GCD). This simplifies the ratio to its smallest whole number form.
For example, to find the ratio of 8 to 12, you would:
- Divide both numbers by their GCD, which is 4.
- 8 ÷ 4 = 2
- 12 ÷ 4 = 3
So, the ratio of 8 to 12 is 2:3.
The Ratio Calculator tool on OctaWebTools allows you to easily calculate and simplify ratios. It is a useful tool for quickly finding the ratio between two numbers without manual calculations, ensuring accuracy and saving time.
Common Aspect Ratios and Screen/Video Resolutions
Aspect ratio refers to the proportional relationship between the width and height of a geometric shape. For rectangles, it is specifically the ratio of the width to the height. While aspect ratios are commonly utilized in various applications like tire and paper sizing, as well as standard photographic prints, they are most frequently applied to computer screens, mobile phone displays, and video formats. Below is a list of common computer screen and video resolutions along with their respective 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 |
