Percentage Calculator
A percentage calculator helps you quickly find what percent one number is of another, calculate percentage increases or decreases, and determine the percentage of a given number. Percentages are used everywhere in daily life from shopping discounts to financial calculations. Understanding how percentages work is essential for making informed decisions about money, health, and business. This tool handles three common percentage scenarios instantly: what is X percent of Y, X is what percent of Y, and what is the percentage change from X to Y. Each calculation is performed with precision and the results are displayed clearly. How the Percentage Calculator works: The calculator uses three standard percentage formulas. To find what percent X is of Y: divide X by Y and multiply by 100. To find X percent of Y: multiply Y by X divided by 100. To find percentage change: subtract the original from the new value, divide by the original, and multiply by 100. Each calculation is performed instantly as you enter values, with results shown to two decimal places for accuracy. Everyday use cases: Calculating sale discounts during shopping. Determining tax amounts on purchases. Computing grade percentages from test scores. Analyzing investment returns and losses. Understanding statistical data in reports. Calculating tip amounts at restaurants. Determining commission earnings on sales. Comparing proportions across different datasets. Tips for accurate results: Percentages can be added only when they refer to the same base value. A 50% increase followed by a 50% decrease does not return to the original value. When calculating percentage change, the order matters: increasing from 100 to 150 is a 50% increase, but decreasing from 150 to 100 is a 33% decrease. Common questions: What is a percentage? A percentage represents a fraction of 100, shown with the % sign. For example, 25% means 25 out of 100, or one quarter of a total. How do I calculate a percentage of a number? Multiply the number by the percentage divided by 100. For example, 25% of 200 is 200 × (25/100) = 50. The Percentage Calculator is one of 57 free math calculators on CalcKit; the Math category covers percentage, fractions, area, volume calculators. How to use it: enter your values into the Percentage Calculator above and the result updates instantly as you type, with no button to press and nothing to install. It is one of 57 free tools in the Math category on CalcKit, alongside Fraction Calculator, Average Calculator, Random Number Generator. Because the calculation runs entirely on your device, your inputs stay private, and the formula notes on this page let you verify every result by hand.