Calculators
Ratio calculator
Simplify whole-number ratios exactly or solve a missing term in a proportion.
Calculation
Calculated in your browser. Your entries are not uploaded.
Calculated in your browser. Your entries are not uploaded.
How to use this calculator
- Choose the calculation and input format.
- Enter your values or load the worked example.
- Read the result, then copy or download it as text.
Calculation rules
Simplification divides both terms by their greatest common divisor. For 48 : 18, the divisor is 6 and the simplified ratio is 8 : 3. Zero is allowed in one term; 0 : 0 has no unique simplified ratio.
Questions and answers
Are large ratios and fractional answers exact?
The proportion solver uses cross multiplication for A : B = C : D. For 2 : 3 = 8 : D, D is 12. Known terms must be positive whole numbers with at most 100 digits. Integer arithmetic keeps reduced ratios and fractions exact; only the optional decimal approximation is rounded.