02
X is what percent of Y?
Compare a part to its whole — useful for completion rates, scores and budgets.
Formula: divide the part by the whole, then multiply by 100: (18 ÷ 24) × 100 = 75%.
FREE CALCULATOR · COMPARE
What Percent Calculator
When you know the part and the whole but not the rate, this calculator fills in the blank. Enter both numbers to see the percentage instantly — handy for scores, completion rates, and comparisons.
How the what percent calculator works
When you know the part and the whole but not the rate, this calculator fills in the blank. Enter both numbers to see the percentage instantly — handy for scores, completion rates, and comparisons.
The formula
(part ÷ whole) × 100
Worked example
You answered 17 of 20 questions correctly. Divide 17 by 20 to get 0.85, then multiply by 100: 85%. Your score is 85 percent.
Where this comes in handy
- Test scores: turn 42 correct out of 50 into a percentage grade.
- Project tracking: 9 of 12 tasks done means the project is 75% complete.
- Health stats: see what share of your daily goal 6,500 steps represents.
- Sales: compare this quarter's 320 units against a 400-unit target.
What Percent Calculator — frequently asked questions
How do you find what percent one number is of another?
Divide the part by the whole and multiply by 100. If 30 of 200 people responded, that is (30 ÷ 200) × 100 = 15%.
What if the part is bigger than the whole?
The percentage will exceed 100%, which is perfectly valid — it means the part is larger than the reference value, as with 120% of a sales target.
What is the difference between this and percentage change?
This compares a part to its whole at one moment. Percentage change compares a value to its own earlier value over time.
How do I convert the result to a decimal?
Divide the percentage by 100. So 85% becomes 0.85 — useful when the next step of your math needs decimal form.
Why does my answer show many decimal places?
Some divisions do not come out even, like 1 ÷ 3 = 33.333…%. The calculator rounds for readability; the underlying math keeps full precision.