What is 18/21 as a percentage? It is 85.71% (rounded to two decimal places). This number tells you how much of a whole 18 parts out of 21 represent.
The fraction 18/21 can be simplified by dividing both the numerator and the denominator by their greatest common divisor, 3, giving 6/7. Whether you see it as 6/7 or 18/21, the value stays the same, and it still corresponds to the same percentage.
Percentages like 85.71% are useful in everyday situations—whether you’re calculating a test score, comparing parts of a budget, or figuring out a discount. Knowing that 18 out of 21 equals 85.71% helps you quickly understand the size of the portion in a familiar, easy‑to‑read form.
