CSS unit converter
CSS unit converter lets you convert px, rem, em, vw, and vh with explicit font and viewport assumptions in your browser.
Ratio and aspect ratio
Ratio and aspect ratio lets you reduce integer ratios and inspect aspect ratios in your browser.
Ratio and aspect ratio
⌂ Inputs and results stay in this browser and are not automatically stored or sent.
Waiting for input
Input
Output
Waiting for input
Complete text result
How to use
Enter corresponding values such as width and height. Distinguish simplifying a ratio from calculating a dimension while keeping that ratio.
A ratio such as 16:9 is not a pixel size. When adopting rounded dimensions, check how closely they preserve the original ratio.
Examples
1920
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1080Principles and limits
Each input is limited to 1,048,576 bytes, output to 33,554,432 bytes, and processing to 5,000 ms. Input is never silently truncated.
Guides
Related tools
Decimal calculator
Decimal calculator lets you evaluate decimal arithmetic and parentheses precisely without eval in your browser.