How to Use the Percentage Calculator
This free percentage calculator provides three essential calculation modes to handle any percentage-related math you encounter. In the first mode, enter a percentage and a number to find what that percentage equals — perfect for calculating discounts, tips, or tax amounts. The second mode lets you find what percentage one number is of another, which is useful for determining grades, completion rates, or proportions.
The third mode calculates the percentage increase or decrease between two values. This is commonly used in finance to track investment gains or losses, in business to measure growth rates, and in everyday life to compare prices. Simply enter the original value and the new value, and the calculator instantly shows you the percentage change along with whether it is an increase or decrease.
Understanding Percentages
A percentage is a way of expressing a number as a fraction of 100. The word comes from the Latin "per centum," meaning "by the hundred." Percentages are used everywhere in daily life — from sales tax and restaurant tips to interest rates and exam scores. Mastering percentage calculations helps you make better financial decisions, understand statistics, and solve everyday math problems quickly and accurately.