Percentage Calculator - Calculate Percentages Online
Our Percentage Calculator is a free, easy-to-use tool that handles all percentage calculations. Whether you need to find what percent one number is of another, calculate percentage change, or add/subtract percentages, this tool does it all.
Features of Percentage Calculator
Our calculator offers four calculation modes:
- X% of Y - Find what percentage of a number is
- X is ?% of Y - Find what percentage one number is of another
- Percentage Change - Calculate increase or decrease between values
- Add/Subtract % - Add or subtract a percentage from a value
Calculation Modes Explained
Mode 1: What is X% of Y?
Find a specific percentage of any number.
- Example: What is 15% of 200? = 30
Mode 2: X is what % of Y?
Find what percentage one number is of another.
- Example: 30 is what % of 150? = 20%
Mode 3: Percentage Change
Calculate the percentage increase or decrease between two values.
- Example: From 100 to 125 = 25% increase
Mode 4: Add/Subtract Percentage
Add or subtract a percentage from a value.
- Example: 100 + 20% = 120
- Example: 100 - 25% = 75
Percentage Formulas
| Calculation | Formula |
|---|---|
| X% of Y | (X ÷ 100) × Y |
| X is ?% of Y | (X ÷ Y) × 100 |
| % Change | ((New - Old) ÷ Old) × 100 |
| Add % | Value × (1 + X÷100) |
| Subtract % | Value × (1 - X÷100) |
Common Percentage Examples
| Scenario | Calculation | Result |
|---|---|---|
| 20% tip on $50 | 20% of 50 | $10 |
| 30% off $80 | 80 - 30% | $56 |
| Sale price to original | 56 is ?% of 80 | 70% |
| Price increase | 80 to 100 change | 25% increase |
FAQs About Percentage Calculator
How do I calculate a tip?
Use "X% of Y" mode: Enter the tip percentage and your bill amount.
How do I find the sale price?
Use "Add/Sub %" mode with subtract: Enter original price and discount percentage.
How do I calculate percentage increase?
Use "% Change" mode: Enter the old value and new value.
What if my percentage change is negative?
A negative percentage change indicates a decrease, which will be shown with a down arrow.
Use Cases
- Shopping - Calculate discounts and sale prices
- Finance - Interest rates and investment returns
- Grades - Calculate test scores and GPA
- Tips - Calculate restaurant gratuity
- Business - Profit margins and markups
- Taxes - Calculate tax amounts
- Real Estate - Commission calculations