Percentage Calculator

How to Use the Percentage Calculator

Our free percentage calculator helps you find percentages in just seconds. Whether you need to calculate a percentage of a number, determine percentage increase or decrease, or work out percentage difference, this tool gives instant, accurate results — no sign-up or download required. Perfect for students, business owners, and anyone working with numbers.

1. Find X% of a Number

Example: 15% of 200

Select “X% of N” mode.
Enter 15 in the Percent (X%) box.
Enter 200 in the Number (N) box.
Click Calculate – your result appears instantly.

2. Find What Percent One Number is of Another

Example: What % is 40 of 200?

Select “What % is A of B?” mode.
Enter 40 in A (part).
Enter 200 in B (whole).
Click Calculate – you’ll see the percentage.

3. Increase or Decrease a Number by a Percentage

Example: Increase 120 by 15%

Select “Increase / Decrease by %” mode.
Enter 120 in Number (N).
Enter 15 in Percent (X%).
Click Increase or Decrease.

4. Calculate Percentage Change

Example: From 80 to 100

Select “% Change (A → B)” mode.
Enter 80 in Start (A).
Enter 100 in End (B).
Click Calculate to see % change.

5. Reverse a Percentage

Example: 1/4

Select “Fraction → %” mode.
Enter 1 in Numerator.
Enter 4 in Denominator.
Click Calculate.

6. Convert a Fraction to a Percentage