# Percentage calculator

This calculator is designed to help you quickly and easily calculate percentages for a variety of purposes. Whether you’re working out how much something has increased or decreased in value, what percentage of a number something is, or what number is a percentage of another value, our percentage calculator can help.

Page written by Ian Hawkins. Last reviewed on June 25, 2024. Next review due July 1, 2025.

This calculator is intended for illustration purposes only and exact payment terms should be agreed with a lender before taking out a loan.

## What is a percentage?

A percentage is a way of expressing a fraction or proportion of a whole, typically out of 100. It represents a portion of something relative to the total amount, where 100% represents the entire quantity or value.

Percentages are commonly used to compare quantities, indicate changes, or express rates in various contexts, such as finance, statistics, mathematics, and everyday life.

## How to calculate percentages

One common method to calculate percentage is the proportion method, where the percentage is calculated by dividing the part by the whole and then multiplying the result by 100. For example, to calculate what percentage 25 is of 100: (25 / 100) x 100, resulting in 25%.

Furthermore, percentages have an interesting reversible property. For example, 25% of 200 = 50. Likewise, 200% of 25 = 50. This demonstrates that percentages can be applied in different ways to get the same result. By understanding this reversibility, you can see how the relationship between numbers and percentages can be flexible, providing a useful tool in various calculations.

There are various techniques and shortcuts for calculating percentages, depending on the specific scenario and calculation required.