Percentage Calculator
Calculate percentages, percentage increase, and percentage decrease instantly. Free percentage calculator for math and finance.
Loading tool...
What is Percentage Calculator?
Percentage Calculator performs all percentage calculations: finding percentages of numbers, calculating percentage increase/decrease, and determining what percent one number is of another. Shows formulas and supports reverse calculations.
Key Benefits
- Multiple calculation types
- Formula display
- Reverse calculations
- Instant results
Common Use Cases
- •Discount calculations
- •Grade computing
- •Financial analysis
- •Data analysis
- •Tip calculations
How to Calculate Percentages
- Choose calculation type: Select: percentage of a number, percentage change, or find percentage.
- Enter your numbers: Input the values based on your calculation type.
- View the result: The result is calculated and displayed instantly with the formula used.
- Use additional features: Try reverse calculations or percentage increase/decrease modes.
Key Features
- Calculate percentages easily
- What is X% of Y?
- X is what % of Y?
- Percentage increase/decrease
- Multiple calculation modes
- Calculation history
Frequently Asked Questions
How do I calculate percentage of a number?
Enter the percentage and the number. For example, to find 20% of 80: enter 20 as percentage and 80 as the number. Result: 16. The formula is (percentage/100) × number.
How do I calculate percentage increase/decrease?
Enter the original value and new value. The calculator shows the percentage change. Positive result means increase, negative means decrease. Formula: ((new-original)/original) × 100.
How do I find what percentage one number is of another?
Enter the part and the whole. For example, 25 is what percent of 200? Answer: 12.5%. Formula: (part/whole) × 100.
Can I reverse-calculate the original from a percentage?
Yes, if you know the result and percentage, you can find the original. For example, if 20% of X is 16, then X = 80. Enter the values and select reverse calculation mode.