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Percentage Calculator

Solve any percentage problem instantly. Find discounts, markups, and calculate growth.

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What is X% of Y?

What is
% of
?
30

X is what % of Y?

is what % of
?
20 %

Percentage Increase/Decrease

From
to
is a
+50 %Increase

The Mathematics of Everyday Life

Percentages are simply fractions out of 100. While the concept is simple, manually applying percentage formulas to real-world scenarios—like retail discounts or stock market losses—can be frustrating.

How to Use This Tool

  1. Step 1: Choose Scenario - Select the type of percentage problem (e.g., finding a discount or % change).
  2. Step 2: Enter Numeric Data - Input your values into the labeled fields for instant calculation.
  3. Step 3: Understand Logic - Read the clear explanation of how the result was derived mathematically.

Deeper Dive

Want to master the formulas behind percentages and discounts?

Read our full Percentage Guide

Frequently Asked Questions

To calculate X% of Y, you divide the percentage (X) by 100, and then multiply that number by the total value (Y). For example, to find 20% of 150: (20 / 100) * 150 = 30.
To find the percentage change between two numbers, subtract the Old Number from the New Number. Then divide that result by the Old Number. Multiply the final result by 100. If the answer is positive, it's a percentage increase. If it's negative, it's a decrease.
Percentages are the foundation of all finance. Interest rates on your bank account, the APR on your credit card, and the ROI (Return on Investment) of your stock portfolio are all expressed as percentages.

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