Aspect Ratio Calculator
/aspect-ratio-calculatorCalculate the aspect ratio of any dimensions, find missing width or height, and get standard ratios instantly.
Mismatched aspect ratios cause letterboxing, cropping, and awkward empty space in media pipelines. This calculator derives the ratio from any dimensions and finds the missing width or height from a known ratio. It also recognizes standard ratios like 16:9 and 4:3. Everything is computed locally.
- 01Upload
- 02Configure
- 03Run
- 04Download
Loading tool...
How to use
How to use Aspect Ratio Calculator
- 1Enter a width and height to derive the ratio.
- 2Or enter a ratio and one dimension to find the other.
- 3Read the result and matching standard ratios.
FAQ
Frequently asked questions
Everything you need to know about aspect ratio calculator.
What can it calculate?
The ratio from width and height, or a missing dimension when you provide one side and a target ratio, both computed instantly.
Does it recognize standard ratios?
Yes. Common ratios such as 16:9, 4:3, 1:1, and 9:16 are matched automatically when the computed ratio corresponds to a known standard.
How is a simplified ratio computed?
Width and height are divided by their greatest common divisor, producing the smallest whole number pair that preserves the same proportions.
How do I find the missing width or height?
Provide one dimension and a target ratio, and the tool multiplies or divides by the ratio to return the missing side, keeping the proportions exact.
Is the calculation done locally?
Yes. Everything runs in your browser with plain arithmetic on the values you type, so your dimensions are never transmitted anywhere.
What are standard ratios used for?
Standard ratios describe common screens, videos, and print formats, so matching them keeps your media looking correct across devices and layouts.
Related tools
same category · same privacy