Free Percentage Calculator Online

Q: How do I calculate X% of Y?

Multiply Y by (X ÷ 100). For example, 20% of 150 is 30.

Q: How do I find what percentage one number is of another?

Divide the first number by the second number and multiply by 100. For example, 25 out of 50 is 50%.

Q: How do I reverse a percentage?

Divide the part by the percentage in decimal form. For example, if 30 is 20% of something, the whole is 150.

Q: How do I calculate percentage difference?

Use |Value1 - Value2| divided by their average, then multiply by 100. For example, the difference between 80 and 100 is 22.22%.

Percentage Calculator

Quickly calculate percentages in 3 ways. No data is stored, privacy safe.

1️⃣ What is X% of Y?

2️⃣ X is what % of Y?

3️⃣ X is Y% of what?

Percentage Difference & Change Calculator

First Value: Second Value:

About This Percentage Calculator

This free online Percentage Calculator helps you solve all common percentage problems easily. Whether you need to find X% of Y, reverse percentages, calculate percentage difference, or determine percentage increase or decrease, this tool gives you instant answers with clear results.

Features:

Find X% of Y: Quickly calculate the percentage of any number.
Reverse Percentage: Find the whole when you know the part and the percent.
Percentage Difference: Compare two values to see how much they differ in percent.
Percentage Increase or Decrease: Calculate how much a value has grown or reduced.

Why Use This Tool?

Completely free and works on all devices (mobile, tablet, desktop)
No login or sign-up required
Privacy-friendly: We do not collect or store your data. All calculations happen in your browser.
Instant results with simple steps—no complicated formulas to memorize

This tool is perfect for students, teachers, business owners, shoppers, or anyone who needs fast and accurate percentage calculations.

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Bookmark this page for fast access to all your calculation needs—completely free and privacy-safe!

Frequently Asked Questions

1. How do I calculate X% of Y?

To calculate X% of Y, multiply Y by (X ÷ 100). For example, 20% of 150 is (20 ÷ 100) × 150 = 30.

2. How do I find what percentage one number is of another?

Use the formula: (X ÷ Y) × 100. For example, if you have 25 out of 50, then (25 ÷ 50) × 100 = 50%.

3. How do I reverse a percentage?

To find the whole when you only know the percentage and part, use this formula: X ÷ (Y ÷ 100). For example, if 30 is 20% of something, the whole is 30 ÷ (20 ÷ 100) = 150.

4. How do I calculate percentage difference?

Use the formula: |Value1 – Value2| ÷ Average × 100. For example, between 80 and 100, the percentage difference is |80-100| ÷ 90 × 100 = 22.22%.

5. How do I calculate percentage increase or decrease?

Subtract the old value from the new value, divide by the old value, and multiply by 100. For example, if something increases from 100 to 120, the increase is (120-100) ÷ 100 × 100 = 20%.