Solve the three most common percentage questions in one place: what is X% of a number, what percent is one number of another, and the percentage increase or decrease between two values. Percentages come up constantly in discounts, tips, tax, grades, growth rates and statistics, and it is easy to make a mistake doing them in your head. This calculator lays out each type clearly with its own inputs so you pick the one you need and get an instant, accurate answer. Whether you are checking a sale price, working out a markup, or measuring how much a number grew, the math is done for you, right in the browser.