Ratio Calculator
Free ratio calculator. Simplify ratios, compare two ratios for equality, or solve proportion problems. Fast and exact.
4 : 6
2 : 3
simplified
Decimal: 0.666667
Ratios compare two quantities. Simplify reduces 8:12 to 2:3; the missing-value mode scales one side of a ratio; compare checks equivalence of two ratios.
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About Ratio Calculator
Simplify any ratio to its lowest terms, check whether two ratios are equal, or solve for the missing value in a proportion a:b = c:?.
How to use it
- 1Enter the numbers of your ratio.
- 2Choose Simplify, Compare, or Solve.
- 3Read the result.
Examples
Simplify
Input
12 : 18Result
2 : 3Solve
Input
3 : 4 = 9 : ?Result
12Frequently asked questions
Can ratios be negative?
The tool treats magnitudes; sign is not part of the ratio.
Does it handle decimals?
Yes - values are scaled to integers before simplifying.
What about zero?
Zero is allowed when the other side is non-zero; 0:0 is undefined.