Calculate percentages, increases, decreases, added values, and more instantly with this free online percentage calculator.
1. What is X% of Y?
Enter values and click Calculate All.
2. Y is what percent of X?
Enter values and click Calculate All.
3. Percentage Increase
Enter values and click Calculate All.
4. Percentage Decrease
Enter values and click Calculate All.
5. Add Percentage to a Number
Enter values and click Calculate All.
6. Subtract Percentage from a Number
Enter values and click Calculate All.
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How to Use the Percentage Calculator
The Percentage Calculator is a fast and easy online tool that helps you solve common percentage problems in seconds.
You can use it to find what percentage of a number, calculate percentage increase or decrease,
and quickly add or subtract percentages from values.
To use the tool, simply enter your values into the correct section and click the Calculate All button.
The calculator will instantly show the result for each completed section. You can also use the
Sample button to load example values and test the calculator.
This tool is useful for discount calculations, tax calculations,
profit analysis, exam score comparisons, salary growth,
and many everyday math situations.
Common Percentage Formulas
Percentage of a Number = (Percentage ÷ 100) × Number
Percentage Increase = ((New Value - Old Value) ÷ Old Value) × 100
Multiple Calculations: Solve several percentage problems in one place.
Fast Results: Get instant answers without manual math.
Student Friendly: Useful for homework, exams, and practice.
Business Friendly: Great for discounts, markups, sales, and profit calculations.
Simple Interface: Easy to use on desktop and mobile.
Free to Use: No login or signup required.
Browser-Based: All calculations happen instantly in your browser.
Where Can You Use It?
You can use this calculator for shopping discounts, GST and tax estimates, school marks,
salary increments, business reports, savings goals, financial planning, and many other situations
where percentages matter.
Frequently Asked Questions (FAQ)
To find X% of Y, divide the percentage by 100 and multiply it by the number.
For example, 20% of 50 is:
(20 ÷ 100) × 50 = 10
To calculate percentage increase, subtract the old value from the new value, divide by the old value,
and multiply by 100.
Example:
Old value = 100, New value = 125
Increase = ((125 - 100) ÷ 100) × 100 = 25%
To calculate percentage decrease, subtract the ending value from the starting value, divide by the starting value,
and multiply by 100.
Example:
Starting value = 80, Ending value = 60
Decrease = ((80 - 60) ÷ 80) × 100 = 25%
Yes, this tool is useful for discounts, price reductions,
tax calculations, markups, and many financial calculations involving percentages.
Yes, this percentage calculator is 100% free and works directly in your browser.
No signup, download, or payment is required.