Everyday math
Find what percentage one number is of another with a clear part-and-whole calculation.
Enter your numbers to see the answer.
What Percent Is One Number of Another? guide
This calculator answers one specific question: what percent is one number of another? Enter the part (the smaller share you have) and the whole (the total it belongs to), and the tool divides the part by the whole and multiplies by 100. Typical uses are a test score out of a maximum, the fraction of a budget already spent, attendance as a share of enrolment, or a payment as a share of a total invoice. The result reads “36 is 15% of 240”, and the calculator shows a check line multiplying back. It is different from the reverse percentage calculator, which starts from a known percentage and a known part and recovers the original whole. It also differs from percentage increase, which compares a before and an after; here the two numbers are a piece and its total, not two points in time.
Percent (%) = part ÷ whole × 100. Check: percent ÷ 100 × whole = part.
Worked example with the defaults: part 36, whole 240. Divide the part by the whole: 36 ÷ 240 = 0.15. Multiply by 100 and the result is 15%, displayed with the caption “36 is what percent of 240?” and a check row reading 15% × 240 = 36. If the part were larger than the whole, say 300 of 240, the answer would exceed 100% (125%), which is valid when the “part” is a value measured against a baseline rather than a slice of it.
Part and whole must be in the same unit, and the unit cancels. Enter plain numbers without % signs. Percent is shown to two decimal places by default, so 1 of 3 displays as 33.33%. A result above 100% means the part exceeds the whole; a result of exactly 100% means they are equal.
The result follows directly from the numbers you entered, so its accuracy is the accuracy of those inputs. The most common source of a surprising answer is a mismatch between the question you meant to ask and the one the calculator answered, so re-read the field labels if the figure looks wrong. The formula is shown above so you can check the arithmetic yourself. On this page the figure rests entirely on part and whole, so start there if the what percent is one number of another? returns something you did not expect.
Good to know: reversing the fields is the usual slip, and 240 ÷ 36 gives 666.67%, an obvious signal. This tool does not find a percentage of a number (that is 15% × 240 = 36, the plain percentage calculator) and does not recover an original value from a known percentage (the reverse percentage calculator). A whole of zero returns 0% because the division is undefined.
Results are planning estimates. Check the units, product coverage, carrier rules, or local rates before making a purchase or financial decision.
How it works
Find what percentage one number is of another with a clear part-and-whole calculation. This tool explains the calculation so you can adjust the assumptions to match your situation.
Worked example
With Part = 36 · Whole = 240 → 15 % (36 is what percent of 240?). Change an input above and this example updates with your numbers.
Common questions
15%. Divide 36 by 240 to get 0.15, then multiply by 100. The check is 15% of 240 = 0.15 × 240 = 36, which matches the part you started with.
Divide the part by the whole and multiply by 100. The smaller share goes on top; the total goes underneath. If your answer is over 100%, the part is larger than the whole.
75%. 45 ÷ 60 = 0.75, and 0.75 × 100 = 75%. This is the same calculation used to convert a test score into a percentage grade: enter the marks earned as the part and the maximum marks as the whole.
Here you know both numbers and want the percent: 36 of 240 is 15%. The reverse percentage calculator knows the percent and the part and finds the whole: if 80 is 80% of something, that something is 100.
Yes, whenever the part is bigger than the whole. 300 of 240 is 125%. That is common when comparing a result to a target, for example sales of 300 against a goal of 240.