What is a Percentage Calculator?
A percentage calculator is a free online tool that helps you calculate percentages of numbers, percentage increases, percentage decreases, discounts, tips, and sales tax. This percent calculator is perfect for shopping, math homework, financial calculations, and everyday use.
Whether you need to calculate a discount on a product, determine a percentage increase in your salary, or figure out a tip at a restaurant, our free percentage calculator gives you instant, accurate results without any signup or registration.
Why Use Our Free Percentage Calculator?
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For Shopping
Calculate discounts, sale prices, and savings instantly while shopping online or in-store.
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For Finance
Calculate interest rates, investment returns, salary increases, and budget percentages.
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For Students
Solve math homework problems involving percentages, ratios, and fractions easily.
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For Daily Life
Calculate tips at restaurants, sales tax, recipe scaling, and more.
How to Use the Percentage Calculator
Our free online percentage calculator offers three powerful calculators in one tool. Here's how to use each:
1. Percentage of a Number
Enter the base number and the percentage you want to calculate. For example, to find 20% of 100, enter 100 as the number and 20 as the percentage. The result will show 20.
2. Percentage Increase / Decrease
Enter the original value and the new value. The calculator will show the percentage change. If the new value is higher, it's an increase. If lower, it's a decrease.
3. Discount Calculator
Enter the original price and the discount percentage. The calculator will show the discounted price and how much you save. Perfect for Black Friday, sales, and coupon calculations.
Common Percentage Calculations
Here are some of the most common percentage calculations people use every day:
- 10% of a number: Move the decimal point one place to the left. 10% of 250 = 25.
- 20% tip: Divide the bill by 5. 20% of $80 = $16.
- 50% off: Divide the price by 2. 50% of $100 = $50.
- 25% discount: Divide the price by 4. 25% of $200 = $50.
- 5% sales tax: Divide the price by 20. 5% of $100 = $5.
- Percentage increase: ((New - Old) ÷ Old) × 100. Salary from $50k to $55k = 10% increase.
- Percentage decrease: ((Old - New) ÷ Old) × 100. Price from $100 to $80 = 20% decrease.
Frequently Asked Questions (FAQ)
What is a percentage?
A percentage is a number expressed as a fraction of 100. For example, 50% means 50 out of 100, or half of a total amount. The symbol "%" is used to denote percentages.
How do you calculate a percentage of a number?
To calculate a percentage of a number, multiply the number by the percentage and divide by 100. Formula: (Number × Percentage) ÷ 100 = Result. For example, 20% of 150 = (150 × 20) ÷ 100 = 30.
How to calculate percentage increase?
Subtract the original value from the new value, divide by the original value, then multiply by 100. Formula: ((New - Original) ÷ Original) × 100. For example, if your salary increased from $50,000 to $55,000, the increase is ((55000 - 50000) ÷ 50000) × 100 = 10%.
How to calculate percentage decrease?
Subtract the new value from the original value, divide by the original value, then multiply by 100. Formula: ((Original - New) ÷ Original) × 100. For example, if a product price dropped from $100 to $80, the decrease is ((100 - 80) ÷ 100) × 100 = 20%.
How to calculate discount percentage?
Subtract the sale price from the original price, divide by the original price, then multiply by 100. Formula: ((Original - Sale) ÷ Original) × 100. For example, a $100 item on sale for $75 has a discount of ((100 - 75) ÷ 100) × 100 = 25%.