Ratio Calculator
Use this ratio calculator to simplify ratios, find equivalent ratios, or solve a proportion when one value is missing.
| Ratio A | |
| Ratio B |
How to Use the Ratio Calculator
Use simplify mode to reduce a two-part ratio, or solve mode to find one missing value in A:B = C:D.
Practical Example
The ratio 12:18 simplifies to 2:3. For the proportion 2:3 = 8:x, cross multiplication gives x = 12.
Factors That Affect the Result
Ratio terms should represent comparable quantities and use compatible units. Decimal ratios can be simplified, but rounding or mixed units can change the interpretation.
Related Tools
Proportion Calculator · Rule of Three Calculator · Unit Rate Calculator · Fraction Calculator · Percentage Calculator
Frequently Asked Questions
How do I simplify a ratio?
Divide every term by their greatest common factor.
Can ratios include decimals?
Yes. The calculator can simplify decimal ratios by scaling them to whole numbers first.
What is an equivalent ratio?
It is a ratio with the same proportional relationship, such as 2:3 and 4:6.