Percentage Calculator

The Percentage Calculator handles the everyday percentage math that comes up constantly but is easy to fumble in your head. It covers the core questions: what is X percent of a number, what percent one number is of another, and what the original value was given a percentage and a part. Each mode applies the basic relationship that a percentage is simply a fraction of 100.

To find a percentage of a value, the tool multiplies the value by the percentage divided by 100; to find what percentage one number is of another, it divides the part by the whole and multiplies by 100. By separating these into distinct modes, the calculator removes the common confusion about which number to divide by, which is the source of most percentage mistakes.

People reach for this when calculating tips, sales tax, discounts, exam scores, commission, or statistical proportions. It pairs naturally with a percentage change calculator for measuring growth or decline over time, and with discount or markup calculators when working through pricing scenarios.

A practical tip is to be clear about which value is the whole, since that anchor determines the answer. For chained calculations such as a discount followed by tax, apply each percentage in sequence rather than adding them together, because percentages of different base amounts do not simply combine by addition.