Percentage Calculator Online
This percentage calculator online is a free tool for common percentage calculations. You can calculate a percentage of a number, find what percentage one value is of another, work out percentage increase or decrease, and calculate the percentage difference between two values. The results update as you enter numbers and show the formula used, making the calculation easier to understand.
Whether you are checking a discount, comparing two values, working with statistics, reviewing a price change, or solving a school or everyday maths problem, this percent calculator provides a quick way to get the result without doing the arithmetic manually.
What Can You Calculate With This Percentage Calculator?
The calculator includes four common percentage calculation methods. What is X% of Y? calculates a percentage of a number. X is what percent of Y? tells you what percentage one number represents of another. Percentage increase or decrease measures the relative change from an original value to a new value. Percentage difference compares two values using their average as the reference.
How to Calculate a Percentage
For a basic percentage calculation, use the formula (percentage ÷ 100) × number. For example, 20% of 150 is 30 because (20 ÷ 100) × 150 = 30. For finding what percentage one value is of another, use (part ÷ whole) × 100.
For percentage change, the calculator uses ((new value − original value) ÷ original value) × 100. A positive result represents an increase and a negative result represents a decrease. For percentage difference, the absolute difference is divided by the average of the two values and multiplied by 100.
Percentage Calculator for Discounts, Prices and Everyday Math
Percentages are commonly used for discounts, sales tax calculations, tips, markups, price changes, test scores, statistics, business comparisons, and budgeting. For example, if an item costs $100 and has a 20% discount, the discount amount is $20 and the price before any other charges is $80. The same percentage formulas can be used with pounds, dollars, euros, or other numeric values because the calculation itself is unit-independent.
This makes the tool useful for visitors in the United States, the United Kingdom, and other regions where percentage calculations are part of everyday shopping, finance, education, and business tasks.
Why Use This Free Percent Calculator?
- Multiple calculation types: Calculate a percentage of a number, percentage of a value, percentage change, and percentage difference.
- Instant results: Results update automatically as values are entered.
- Formula display: Each calculation shows the formula used so you can understand the result.
- Decimal-friendly: Useful for calculations involving decimal values.
- Free and simple: No mandatory registration is required to use the calculator.
- Mobile-friendly: Designed for modern desktop and mobile browsers.
Examples of Percentage Calculations
What is 25% of 200? The answer is 50.
25 is what percent of 100? The answer is 25%.
What is the percentage increase from 100 to 150? The increase is 50%.
What is the percentage difference between 100 and 150? The percentage difference is 40%.