Need to calculate a discount, a tip, or a pay rise? Our free online Percentage Calculator makes it easy to solve any percentage-related math problem in seconds. From finding a simple percentage of a number to calculating percentage increases or decreases, this all-in-one utility tool is perfect for students, business owners, and shoppers alike. No manual math requiredjust enter your values and get an instant result.
How to Calculate Percentages
The Basics
A percentage is a number or ratio expressed as a fraction of 100. It represents a part of a whole, where 100% is the complete amount.
Real World Use
Use our tool to calculate sales tax, retail discounts, tip amounts, interest rates on loans, pay raise percentages, and profit margins.
Quick Tips
- Always double-check if you are looking for the increase or the final amount
- For discounts: subtract the percentage from 100, then multiply
- For tips: calculate on the pre-tax total for accuracy
Frequently Asked Questions
How do I calculate 20% of a number?
Multiply the number by 0.20. For example, 20% of 100 is 20. You can also divide the number by 5 to get the same result.
What is the formula for percentage increase?
Subtract the original number from the new number, divide that by the original number, and multiply by 100. Formula: ((New - Old) / Old) × 100
Can I use this for my math homework?
Yes! Our calculator is designed to provide instant results for educational and professional use. It's perfect for homework help, exam preparation, and everyday calculations.
How do I calculate a discount?
To calculate a discount, multiply the original price by the discount percentage (as a decimal), then subtract from the original price. Or use our "Find Percentage" tool to find the discount amount, then subtract.