12/18 as a percentage is 66.67%. This means that the fraction represents roughly two‑thirds of a whole when expressed in percent form.
The fraction 12/18 can be simplified by dividing both numbers by their greatest common divisor, which is 6. This gives the simpler fraction 2/3, and it still equals the same percentage when converted.
Knowing the percent makes it easy to compare with other numbers in everyday situations, like grading, discounts, or statistics. It shows that the value is a little more than halfway, but not quite three‑quarters of the whole.