Aspect Ratio Calculator
Reduce an image ratio and calculate proportional height or width for a target dimension.
Calculate with your own values
Local processing. No account, uploads or saved history.
Your result
Formula & assumptions
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How to use Aspect Ratio Calculator
- Enter your values and select the applicable mode or units; Load example shows a complete sample.
- Select Calculate, then review the result, formula and counting assumptions.
- Copy the result or download its CSV. Changing an input clears the previous result.
What this tool does
Reduces integer source dimensions by their greatest common divisor. Choose a target width or height to calculate the other dimension. Shows the exact proportional value and a nearest-pixel recommendation with its rounding error. This calculator does not resize or upload an image.
Supported files, limits & important details
Source and target dimensions must be positive whole pixels, at most 1,000,000 each. Rounded exports can slightly change the exact aspect ratio. Browser-local processing; no inputs are uploaded or saved. Numeric inputs are limited to an absolute value of 1 trillion. Results are estimates using JavaScript floating-point arithmetic, not certified financial or engineering calculations.
Input limits are enforced before processing. Clear removes your input and result from this page. This tool does not store your input between visits.
Keep your workflow moving
Questions about Aspect Ratio Calculator
How do I use Aspect Ratio Calculator?
Enter your values and select the applicable mode or units; Load example shows a complete sample. Select Calculate, then review the result, formula and counting assumptions. Copy the result or download its CSV. Changing an input clears the previous result.
Are files or text uploaded when I use Aspect Ratio Calculator?
No. Aspect Ratio Calculator processes your input in your browser. The tool does not upload your document or text for processing. Keep your original and review the result.
What should I check before relying on Aspect Ratio Calculator?
Reduces integer source dimensions by their greatest common divisor. Choose a target width or height to calculate the other dimension. Shows the exact proportional value and a nearest-pixel recommendation with its rounding error. This calculator does not resize or upload an image.
Need help choosing a workflow? Read our practical PDF and file guides. How your data is handled.