Everyday math
Find a percentage of a number quickly and clearly.
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Percentage calculator guide
Percentages describe a quantity out of 100. This calculator handles the common “what is P% of N?” question by converting the percentage to a decimal and multiplying it by the number. That is useful for discounts, tips, tax estimates, test scores, budgets, and quick comparisons. A percentage is not the same as a percentage point: moving from 20% to 30% is a 10 percentage-point increase, but it is a 50% relative increase from the original 20%. When you are comparing a part with a whole, use part ÷ whole × 100 instead. When a known part and percentage are given and you need the whole, divide the part by the decimal percentage. Read the wording first, because “15% of 240,” “15 is what percent of 240,” and “15 is 15% of what number?” are three different questions. That small wording check prevents most percentage mistakes before you touch the calculator.
To find a percentage of a number: result = percentage ÷ 100 × number. To find what percent one number is of another: percent = part ÷ whole × 100. To find the whole from a part: whole = part ÷ (percentage ÷ 100).
Worked example with the defaults: to find 15% of 240, convert 15% to a decimal, 15 ÷ 100 = 0.15, which the calculator shows as the decimal equivalent. Then multiply: 0.15 × 240 = 36, the result it displays. As a mental check, 10% of 240 is 24 and 5% is half of that, 12; 24 + 12 = 36. If the question were “36 is what percent of 240?”, reverse the operation: 36 ÷ 240 × 100 = 15%. And if 36 is 15% of an unknown number, that number is 36 ÷ 0.15 = 240.
Percentages are dimensionless, but the number beside them may represent dollars, people, points, or another unit. Keep the unit attached to the result: 15% of $240 is $36. Enter 15 for 15%, not 0.15, because the calculator performs the divide-by-100 conversion for you and displays that decimal in the results.
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 percentage and number, so start there if the percentage calculator returns something you did not expect.
Identify the base number before calculating. Do not subtract a 20% discount and then assume adding 20% returns to the original price: $100 less 20% is $80, and $80 plus 20% is only $96, because percentage changes use the current base each time. Distinguish a percentage from a percentage-point change when reading interest rates or poll results. Do not enter 0.15 when you mean 15%, or the result will be 100 times too small, and do not confuse “percent of” with “percent more than”: 15% more than 240 is 276, not 36.
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 a percentage of a number quickly and clearly. This tool explains the calculation so you can adjust the assumptions to match your situation.
Worked example
With Percentage = 15 % · Number = 240 → 36 (15% of 240). Change an input above and this example updates with your numbers.
Common questions
15% of 240 is 36. Convert 15% to the decimal 0.15 and multiply: 0.15 × 240 = 36. The same method gives 15% of $240 as $36 or 15% of 240 students as 36 students.
Divide the part by the whole and multiply by 100. For example, 36 ÷ 240 × 100 = 15%, so 36 is 15% of 240. Make sure the whole is the original or reference amount, not the part.
Divide the percent by 100, or move the decimal point two places left. For example, 15% becomes 0.15, 7.5% becomes 0.075, and 150% becomes 1.5. Reverse the step to turn a decimal back into a percentage.
No. Percentage points describe the direct difference between two percentages, such as 20% to 30% being 10 points. Percentage change compares that difference with the original value, so the same move is a 50% increase.
Find the percentage of the original amount, then subtract it for a discount or add it for a tip. A 15% tip on a $240 bill is $36, making the total $276; a 15% discount on the same amount leaves $204.