Percentage Calculator
Calculate percentages instantly. Find percentage of numbers, percentage increase/decrease, discounts, and more.
Calculate what X% of a number is
Enter numbers above to calculate
Free Percentage Calculator – Calculate Any Percentage Instantly
Our free percentage calculator handles all your percentage needs in one place. Whether you need to find what percent one number is of another, calculate percentage increases or decreases, or figure out sale prices with discounts – this tool does it all instantly.
Perfect for students, shoppers, business professionals, and anyone who works with percentages. No signup required, works on any device, and gives you instant results.
How to Calculate Percentages
Basic Formula: Percentage = (Part ÷ Whole) × 100
X% of Y: (X ÷ 100) × Y
Percentage Change: ((New − Old) ÷ |Old|) × 100
Discount: Original Price × (1 − Discount% ÷ 100)
Calculator Modes
- What is X% of Y? – Find a percentage of any number (e.g., 15% of 200 = 30)
- X is what % of Y? – Find what percentage one number is of another (e.g., 25 is 12.5% of 200)
- Percentage Change – Calculate increase or decrease between two values (e.g., 80 to 100 = +25%)
- Discount Calculator – Find the final price after applying a discount percentage
Common Percentage Uses
Calculate discounts, sales tax, and tip amounts
Grade percentages, test scores, and GPA
Interest rates, investment returns, profit margins
Body fat percentage, weight change, nutrition
Frequently Asked Questions
How do I calculate a percentage?
To calculate what percent X is of Y, divide X by Y and multiply by 100. For example, 25 is 50% of 50 because (25 ÷ 50) × 100 = 50%.
How do I find X% of a number?
Multiply the number by the percentage and divide by 100. For example, 20% of 150 = 150 × 20 ÷ 100 = 30.
How do I calculate percentage increase?
Subtract the old value from the new value, divide by the old value, and multiply by 100. For example, going from 80 to 100: (100-80) ÷ 80 × 100 = 25% increase.
How do I calculate a discount?
Multiply the original price by the discount percentage, then divide by 100. Subtract this from the original price. For 20% off $100: $100 × 20 ÷ 100 = $20 savings, final price = $80.
What is the formula for percentage?
The basic percentage formula is: Percentage = (Part ÷ Whole) × 100. This formula can be rearranged to solve for any unknown value.