Percentage Calculator
Calculate percentages and % change
How to Use Percentage Calculator
- 1
Choose the type of percentage calculation: percentage of a number, percentage change, or what percentage X is of Y.
- 2
Enter the values.
- 3
The result is shown instantly. Copy it if needed.
About Percentage Calculator
Calculate percentages, percentage change, what percentage X is of Y, and percentage increase/decrease. Free online calculator.
Best Use Cases
- •Finding what percentage one number is of another for reports
- •Calculating percentage increase or decrease between two values
- •Finding the result of applying a percentage to a base number
- •Calculating grade percentages for academic scores
- •Determining markup or discount percentages for pricing
Examples
Grade calculation
Enter 42 out of 50 to find it equals 84%. Quick way to convert scores to percentages.
Price change
Enter old price $80 and new price $100. See the percentage increase is 25%.
Discount amount
Enter $250 and 15% to find the discount is $37.50 and the final price is $212.50.
Common Mistakes to Avoid
- !Confusing percentage of vs percentage change, which are different calculations
- !Entering decimal percentages (0.15) instead of whole numbers (15)
- !Calculating percentage change with the wrong base value in the denominator
Limitations
- –Handles one calculation at a time, not batch percentage operations
- –Does not show step-by-step formula breakdowns for learning purposes
- –Rounding may occur for results with many decimal places
Disclaimer
This tool is for informational and educational purposes only. Results are estimates and should not be treated as financial, tax, legal, or investment advice. Always consult a qualified professional before making financial decisions.
Frequently Asked Questions
How do I calculate a percentage?
To find X% of a number, multiply the number by X and divide by 100. For example, 20% of 50 = 50 × 20 / 100 = 10.