Calculate ratios and proportions
Simplify a whole-number ratio or find x in a/b = c/x.
Input & settings
How to use this tool
For simplification enter nonnegative whole numbers a and b, not both zero. For a proportion, enter positive a and b plus nonnegative c.
Limits and behavior
Results use floating-point arithmetic, rounded to 12 significant digits. Inputs are limited to an absolute value of 10^12 and results to 10^15. Ratio simplification is exact with integers up to 10^9. The proportion result is b × c ÷ a. Input is limited to 1 MB and output to 3 MB. No input content is saved by CraftAI.
Simplify ratios and solve proportions
Use integer ratios or enter a supported proportion to find an unknown value.
Can every ratio be reduced using integer factors?
Integer ratios simplify using common factors; non-integer or differently defined proportions may need another representation.
Related tools: calculate fractions · calculate percentage