Percentage Calculator

Calculator

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Percent Whole

36

Percent of value

Percent of value 15% of 240

Percentage Basics

Percentages, percentage change, and part-to-whole maths

A percentage calculator helps with three common tasks: finding a percentage of a number, finding what percentage one value is of another, and measuring percentage increase or decrease. These are everyday calculations used in shopping, finance, grades, and general maths.

Percent of a value

When users ask what is x percent of y, they are converting a rate into part of a whole. A percent is simply a quantity measured per hundred, so 25% means 25 out of 100, or 0.25 as a decimal.

Part = (Percent / 100) x Whole

This is the standard formula behind discount calculators, tip calculators, and many basic percentage tools.

Finding what percent one number is of another

This version compares a part against a base. It is common in school work, business reporting, and performance analysis because it converts an absolute comparison into a relative one.

Percent = (Part / Whole) x 100

If 30 is compared with 120, the result is 25%, because 30 is one quarter of 120.

Percentage change

Percentage change compares the size of a difference with the starting value. It is the standard method for expressing growth, decline, or price movement in relative terms.

Percent change = ((New - Old) / Old) x 100

A positive value indicates an increase and a negative value indicates a decrease.

Use percentage increase when the new value is larger than the starting value.
Use percentage decrease when the new value is smaller than the starting value.
A quick percentage calculator is often easier than doing decimal conversions by hand, especially on mobile.

If you are comparing options or checking related figures, these calculators may help.

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