Ratio studio
Solve proportions, rescale dimensions, and browse a definitive aspect-ratio table inspired by calculator.net—rebuilt with Pixalor polish and precision.
Provide any three values from A:B = C:D to solve the missing term.
Enter a pair of dimensions, choose shrink or enlarge, and scale them proportionally for print, UI, or motion design.
Reference text
Complete narratives for ratios, proportions, and aspect ratios so you can match the legendary calculator.net depth.
A ratio compares quantities using relative size. Writing A:B describes how many parts of A correspond to each part of B. Ratios can be simplified by dividing both sides by their greatest common divisor.
Ratios are scalable. Multiplying or dividing both sides by the same non-zero number keeps the relationship intact, which makes ratios useful when resizing photos, screens, or recipes.
A proportion states that two ratios are equal. In the classic form A:B = C:D, any three values determine the fourth because the cross-products must match (A × D = B × C).
Proportions allow you to scale real-world measurements. If a 3:4 rectangle is 6 cm wide, the height must be 8 cm to maintain the same shape.
Aspect ratio is a specialized ratio describing width relative to height. Film, photography, design mockups, and responsive layouts rely on preserved aspect ratios to avoid distortion.
Pick any width, divide by the aspect ratio, and you obtain the proportional height. Tables of common resolutions help you match industry standards quickly.
Aspect ratios & screen sizes
Width, height, and ratio pairs for the most popular device classes, cinema specs, and social formats.
| Name | Aspect ratio | Width (px) | Height (px) |
|---|---|---|---|
| HD (720p) | 16:9 | 1280 | 720 |
| Full HD (1080p) | 16:9 | 1920 | 1080 |
| 2K | 17:9 | 2048 | 1080 |
| QHD | 16:9 | 2560 | 1440 |
| 4K UHD | 16:9 | 3840 | 2160 |
| DCI 4K | 17:9 | 4096 | 2160 |
| 5K | 16:9 | 5120 | 2880 |
| 8K UHD | 16:9 | 7680 | 4320 |
| Instagram Reel | 9:16 | 1080 | 1920 |
| Square | 1:1 | 1080 | 1080 |
| Cinematic | 21:9 | 2520 | 1080 |
| Classic 35mm | 3:2 | 3000 | 2000 |