Percentage Calculator
Calculate percentages, percentage change, and what percent X is of Y.
Free Percentage Calculator
Percentages come up constantly in everyday life — calculating a restaurant tip, figuring out a sale discount, understanding a grade, or working out how much tax to add to a price. This calculator handles three common percentage problems in one place, with results updating in real time as you type.
No more second-guessing whether you're doing the math right. Enter your numbers, pick the type of calculation, and get the answer — along with the formula used, so you understand how it was calculated and can do it yourself next time.
How to Calculate Percentages
There are three fundamental percentage calculations. Finding a percentage of a number: multiply the number by the percentage and divide by 100. For example, 15% of 200 = (15 / 100) x 200 = 30. Finding what percentage one number is of another: divide the part by the whole and multiply by 100. For example, 30 is what % of 200? = (30 / 200) x 100 = 15%. Percentage change: subtract the original from the new value, divide by the original, and multiply by 100. For example, 200 to 250 = ((250 - 200) / 200) x 100 = +25%.