Ratio Calculator
Simplify a ratio or find the missing term in a proportion a:b = c:d.
Solve A:B = C:D — enter A, B, C and D is computed.
How it works
Simplify by dividing both sides by GCD. Proportion: if a/b = c/d, then ad = bc.
12:18 simplifies to 2:3. 2:3 = x:12 → x = 8.
Frequently asked questions
- What is a ratio?
- A comparison of two quantities by division.
- Ratio vs fraction?
- Same math; ratios express part-to-part, fractions part-to-whole.
- How do I scale a recipe?
- Multiply each ingredient by the same ratio.
- Are 3:2 and 6:4 equal?
- Yes — both simplify to 3:2.
More in Math
- PCPercentage Calculator
Calculate percent of a number, percentage change, and percent difference between two values — with reverse solving for base, part, and percent supported.
- SCScientific Calculator
Free online scientific calculator with trigonometry, logarithms, exponents, square roots, factorials, parentheses, and memory — no download or install needed.
- FCFraction Calculator
Add, subtract, multiply, divide, and simplify proper, improper, and mixed fractions with automatic reduction to lowest terms and decimal equivalents shown.
- SDStandard Deviation Calculator
Compute sample and population standard deviation, variance, mean, and sum of squares from any comma or space-separated dataset with step-by-step results.
You might also need
Tools from other categories that people commonly pair with the Ratio Calculator.
- GCGPA Calculator
Compute grade point average on the 4.0 scale, weighted by credit hours, from letter or numeric grades across any number of courses in a semester or year.
- GCGrade Calculator
Compute your final class grade from assignment weights and scores, plus the minimum score needed on remaining work to reach a target letter grade or percent.