Calculate
Ratio Calculator
Two ratio tools: simplify a ratio to its lowest whole-number terms, and solve a proportion to find a missing value. Calculated locally.
Simplify a ratio
LocalSolve A : B = C : D
FAQ
Common questions
Both parts are divided by their greatest common divisor, giving the smallest whole-number equivalent.
For A:B = C:D with one value missing, it cross-multiplies to solve for the unknown (e.g. D = B×C ÷ A).
The proportion solver accepts decimals; the simplifier works best with whole numbers.
No. All calculation happens in your browser.
Private by design
This runs entirely in your browser
No file or text you enter here is uploaded. Encoding and decoding happen on your device using native browser APIs — close the tab and nothing remains on a server.