How do I calculate X% of Y?

Enter X and Y in the first tab. The tool instantly shows the result.

What is percent increase or decrease?

Enter the original and new values. The tool calculates the percentage change between them.

Yes, completely free with no usage limits.

How do I find what percent A is of B?

Enter both numbers in the third tab. The tool calculates what percentage the first number is of the second number instantly.

Can I calculate percentage of a number?

Yes. Use the first tab to enter the percentage and the total amount. The tool shows the result along with a breakdown for common percentages.

Free Tool — 4 Modes, Instant Results

Percentage Calculator

Calculate percentages in 4 different ways: find a percentage of a number, determine what percent one number is of another, or compute percent increase/decrease.

Calculate what is X% of Y. Enter the percentage and the number.

Percentage (%)

Number

Calculate X is what percent of Y. Enter both numbers.

Number (X)

Total (Y)

Calculate the percentage increase or decrease from one value to another.

From (Original)

To (New)

Increase or decrease a number by a percentage.

Number

Percentage (%)

12.5% of 2000 = 250.00

Formula: (Percentage ÷ 100) × Number

Why Use AFFLIGO?

100% Private

Your numbers stay in your browser. Nothing sent anywhere.

4 Calculation Modes

Cover all common percentage scenarios in one tool.

Formula Shown

See the math behind every result — great for learning.

More Tools

SIP Calculator

EMI Calculator

GST Calculator

Case Converter

How to Use Percentage Calculator

Step 1

Select a Calculation Mode

Choose from X% of Y, Is What %, % Change, or Change by %.

Step 2

Enter Numbers

Type the values into the input fields for your selected calculation.

Step 3

View & Copy Result

The result and mathematical formula are shown instantly. Click Copy Result to copy.

Frequently Asked Questions

What calculations are supported?

Find X% of Y, what percent X is of Y, and percent increase/decrease between two numbers.

Is calculation instant?

Yes, results update in real-time as you type the numbers.

Can I use decimal numbers?

Yes, supports decimal numbers for precise calculations.

Is my data private?

Yes, all calculations happen in your browser. No data is sent to any server.

Can I copy the result?

Yes, click the Copy Result button or click directly on the result text to copy to your clipboard.