63/66 as a percentage is 95.45%. This is the quick answer you’re looking for.
The fraction 63/66 is just a little less than a whole. When you think of it, it means you have 63 parts out of 66 equal parts, which is very close to 1 or 100%.
We usually round the result to two decimal places, so 95.45% is the tidy number you can use in reports, charts, or everyday calculations.