How it works
A ratio compares two quantities in the same order. The calculator reduces the two values by their greatest common divisor and also shows the decimal value of the first quantity divided by the second.
Standard formula
first quantity ÷ second quantityWorked example
For 8 and 12, the greatest common divisor is 4, so 8:12 simplifies to 2:3. The decimal ratio is 0.666667.
Frequently Asked Questions
What does a ratio compare?
It compares the relative size of two quantities in a stated order.
Can I enter decimals?
Yes. Decimal inputs are supported, while the simplified form is most useful for whole numbers.
Can the second quantity be zero?
No. A decimal ratio cannot divide by zero.
Does order matter?
Yes. 2:3 is different from 3:2.