Ratio calculator — simplify and scale
Enter two numbers and get the ratio in lowest terms, as a decimal, and scaled to any target. It calculates in your browser (0 uploads, works offline).
How to use it
- Enter your values in the fields above.
- The result and a short explanation appear instantly.
- Copy or Download the result.
FAQ
How do I simplify a ratio for free?
Enter the two terms and the simplified ratio appears instantly in your browser with no upload — for example 1920:1080 becomes 16:9. It also shows the ratio as a decimal and can scale it to a target you choose.
How do I scale a ratio to a new size?
Enter a value in "scale first term to" and the second term is scaled to match, keeping the ratio — handy for resizing images or mixing quantities.
Is my data uploaded?
No. The calculation runs locally and nothing is stored; it works offline.
Does it handle decimals?
Yes — decimal terms are scaled to whole numbers before simplifying, so 4.5:1.5 becomes 3:1.
Limits
Simplifies using the greatest common divisor. Very long decimals are rounded before simplifying.
Related
The percentage calculator handles proportions as percentages; the unit converter changes units.
Bookmark this page (Ctrl+D, or ⌘D on Mac) or install the app — it works offline the next time you need it.