Units & Numbers Tools
Ratio Calculator
Simplify ratios and solve for missing ratio terms.
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What is Ratio?
A ratio tool: simplification via GCD, missing-term solving via cross-multiplication, and ratio→percent conversion for mixing and scaling tasks.
How it works
Simplification divides both terms by their GCD; solving uses cross-products (a/b = c/d → d = b·c/a); percentages compute term ÷ sum.
- Enter your input. Type or paste your input into the field above — the tool responds instantly.
- Review the result. Output updates live as you type. Everything runs entirely in your browser.
- Copy or download. Use the Copy button to grab the result, or Download to save it as a file.
Examples
Scaling a recipe or mix
Scale a 2:3:5 concrete mix up to 20 parts total — or simplify 24:36 down to 2:3 in lowest terms.
Common mistakes
Ratios vs fractions
A 1:2 ratio means 1 part to 2 parts (3 total), not 1/2. The calculator keeps the part-to-part interpretation explicit.
Frequently asked questions
Can it handle three-part ratios?
Yes — simplify and scale ratios with any number of terms.
What does simplifying do?
It divides every term by their greatest common factor, so 24:36 becomes 2:3 while keeping the same proportions.