Everyday utility

Percentage Calculator

Calculate percentages, find what percent a number is, or compute percent change. Use this Data and utilities tool to enter your numbers, review the result, and understand the key assumptions before making the next decision.

What you get
A focused calculator, clear explanation, common questions, and useful next tools.
Quick intro
Calculator
Result
Explanation
Common questions
Related tools

Calculator tool

How this calculator works
The result depends on the numbers you enter and the assumptions shown below.

Three modes: (1) Percentage of — find X% of a number. (2) What % is — find what percentage one number is of another. (3) Percent change — calculate the percentage increase or decrease between two values.

Review the inputs carefully and treat the output as an estimate. For decisions involving money, taxes, health, law, or security, compare the result with trusted professional guidance when needed.

Frequently asked questions

How do I calculate a percentage of a number?

Multiply the number by the percentage and divide by 100. For example, 15% of 200 = 200 × 15 / 100 = 30.

How is percent change calculated?

Percent change = (new value − old value) / old value × 100. A positive result means an increase; negative means a decrease.