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Aspect Ratio Calculator
Simplify aspect ratios, calculate matching dimensions, and compare common video, photo, and screen formats.
aspect ratio calculatorscreen ratio calculator16:9 calculatoraspect ratio converter
Mode 1
Find the aspect ratio from dimensions
Simplified ratio
16:9
Decimal ratio
1.778:1
Visual preview
16:9
1920 × 1080
Mode 2
Calculate the missing dimension
Enter one dimension with a ratio to calculate the other side automatically.
Common presets and resolutions
Popular screen formats| Preset | Decimal | Resolution examples |
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How to use
How to simplify aspect ratios and calculate matching dimensions for screens or media
- 1 Enter any width and height in the first section to simplify the dimensions into an aspect ratio such as 16:9 or 4:3.
- 2 Use the lock toggle if you want to resize the width or height while keeping the same ratio intact.
- 3 Click a common preset like 16:9, 21:9, or 9:16 when you want to jump to a standard video, monitor, or mobile format.
- 4 In the second section, enter the ratio and only one dimension to calculate the missing width or height automatically.
- 5 Compare the preset table and resolution examples when you need common pixel sizes for design, editing, or display planning.
Aspect ratio calculations appear in video editing, graphic design, photography, responsive layouts, presentation slides, and display hardware. If you know the width and height of an image or screen, simplifying those numbers into a ratio makes it much easier to compare formats quickly. This is useful for recognizing whether a file is standard widescreen, square, ultrawide, or vertical video.
The reverse workflow is just as important. Once you know a ratio, you often need to scale it up or down while preserving the same proportions. That is where the missing-dimension calculator and lock option help. They let you test new sizes without stretching the image or breaking the intended layout, which makes the tool practical for creators, developers, and anyone planning screen-based content.
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