Aspect Ratio Calculator
Calculate width or height for a target aspect ratio and simplify ratios.
Aspect ratio
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Edit the ratio, or type a width/height — the other dimension follows the ratio.
Simplified ratio: 16:9
How to use the Aspect Ratio Calculator
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Enter a ratio or pick a preset.
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Type one known dimension.
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Read the matching dimension.
Aspect ratio calculator
Aspect ratio is the proportional relationship between width and height (like 16:9). When resizing images or video, you set one dimension and need the other to avoid distortion. This calculator fills in the missing value and reduces any width×height to its simplest ratio.
Key features
- Solve for width or height
- Common presets (16:9, 4:3, 1:1…)
- Simplify any ratio
- Instant calculation
Frequently asked questions
What does 16:9 mean?
For every 16 units of width there are 9 of height — the standard widescreen video ratio.
Can it simplify a ratio?
Yes — enter any width and height and it reduces them to the smallest whole-number ratio.
Does it round dimensions?
It shows the exact value and a rounded pixel value where helpful.