Math & Calculators•Free & Browser-Based
Ratio Calculator
Solve equivalent ratios (A:B = C:D), simplify complex ratios to lowest terms, and scale proportions up or down.
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Equivalent Ratio Solution
D = 15.00
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What is the Free Online Ratio Calculator?
A ratio compares two quantities by division. The Ratio Calculator solves for an unknown fourth variable in proportional equations ($A:B = C:D$) and simplifies ratios to their simplest integer form.
100% Client-Side Privacy: Calculations and data processing occur entirely in your local browser memory. Zero files or personal inputs are uploaded to our servers.
How to Use Ratio Calculator Online: Step-by-Step Guide
- 1To find an unknown term: leave any one field blank ($A$, $B$, $C$, or $D$) and enter the other three.
- 2To simplify a ratio: enter $A$ and $B$ to reduce them by their Greatest Common Divisor.
Mathematical Formula & Underlying Logic
\frac{A}{B} = \frac{C}{D} \implies A \times D = B \times C
Real-World Calculation Example
Solve $4 : 6 = 10 : X$. Cross-multiplying: $4X = 60 \implies X = 15$.
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