Percentage Calculator: Master the Math Behind Everyday Numbers

Percentages are everywhere—discounts, tips, grades, statistics, and financial calculations. Understanding how to calculate percentages quickly can save you both time and money.

Use this guide alongside a percentage calculator to solve any percentage problem instantly and understand the math behind it.

What Is a Percentage?

A percentage represents a fraction of 100. The word comes from the Latin per centum, meaning "by the hundred."

• 50% means 50 out of 100, or 1/2.
• 25% means 25 out of 100, or 1/4.
• 75% means 75 out of 100, or 3/4.

You can think of percentages as another way to write fractions and decimals:

• 50% = 0.50 = 1/2
• 20% = 0.20 = 1/5
• 5% = 0.05 = 1/20

Essential Percentage Formulas

1. Finding a Percentage of a Number

Formula: