🔢 Percentage Calculator
Calculate percentages, increases, decreases, and more
What is X% of Y?
X is what % of Y?
Percentage Increase
Percentage Decrease
Increase Number by X%
Decrease Number by X%
About Percentage Calculator
Our Percentage Calculator is a comprehensive tool for all your percentage calculation needs. Whether you're calculating discounts, tax, tips, grade scores, or financial changes, this calculator provides instant, accurate results for various percentage operations.
Common Percentage Calculations
What is X% of Y? Find a percentage of a number. Example: What is 15% of 200? Answer: 30
X is what % of Y? Find what percentage one number is of another. Example: 50 is what % of 200? Answer: 25%
Percentage Increase: Calculate the percentage increase from one value to another. Example: From 100 to 150 = 50% increase
Percentage Decrease: Calculate the percentage decrease from one value to another. Example: From 100 to 75 = 25% decrease
Real-World Applications
- Shopping: Calculate discounts and sale prices
- Finance: Calculate interest rates, returns, and changes
- Business: Analyze growth rates and profit margins
- Education: Calculate grade percentages and scores
- Cooking: Adjust recipe quantities by percentage
- Fitness: Track weight loss or gain percentages
Percentage Formulas
Basic Percentage: (Part / Whole) × 100 = Percentage
Percentage of a Number: (Percentage / 100) × Number = Result
Percentage Change: ((New - Old) / Old) × 100 = % Change
Percentage Increase: Original × (1 + Percentage/100) = New Value
Percentage Decrease: Original × (1 - Percentage/100) = New Value
Tips for Working with Percentages
- Remember the Base: Always identify what 100% represents
- Convert to Decimals: Divide by 100 to convert percentage to decimal
- Check Your Work: Results should make logical sense
- Round Appropriately: Use 2 decimal places for money, more for precision
Frequently Asked Questions
How do I calculate a discount?
Use "Decrease Number by X%" calculator. Enter the original price and the discount percentage to get the final price.
What's the difference between percentage increase and decrease?
Percentage increase shows growth (positive change), while percentage decrease shows reduction (negative change). Both use the same formula but interpret direction differently.
Can percentages be greater than 100%?
Yes! Percentages over 100% indicate values greater than the whole. For example, 200% means twice the original amount.
How do I calculate tip at a restaurant?
Use "What is X% of Y?" calculator. Enter the tip percentage (15%, 18%, 20%) and your bill amount to get the tip amount.