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FREE ONLINE PERCENTAGE CALCULATOR
Three percentage calculators in one. Calculate percentages, discounts, and percentage change instantly. Free, no signup, works everywhere.
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What is a Percentage Calculator?
A percentage calculator handles the three most common percentage calculations instantly. Whether you need to find a discount, calculate a grade percentage, or measure growth, our three-in-one tool covers it all for free.
Three Types of Percentage Calculations
Calculator 1: What is X% of Y?
Use when you know the percentage and the total. Example: What is 15% of 200? Answer: 30. Perfect for tips, discounts, and commissions.
Calculator 2: X is what percent of Y?
Use when you know both numbers and want the percentage. Example: 45 is what percent of 180? Answer: 25%.
Calculator 3: Percentage change
Measures increase or decrease between two values. Example: from 80 to 100 is a 25% increase.
Real-World Uses for Percentage Math
- Shopping discounts — calculate sale prices and savings
- Tax calculations — work out VAT or sales tax
- Grade calculations — convert test scores to percentages
- Finance — calculate interest rates and investment returns
- Tipping — quickly calculate 10%, 15%, or 20% tips
Frequently Asked Questions
What is a percentage?+
A percentage is a number expressed as a fraction of 100. 25% means 25 out of every 100.
How do I calculate 20% of a number?+
Multiply the number by 0.20. For example 20% of 150 = 30. Or use the first calculator above.
What is percentage change?+
It measures how much a value has increased or decreased. Formula: ((New - Old) / Old) x 100.
How do I calculate a discount?+
Use Calculator 1. For a 30% discount on 50, enter 30 and 50 to get 15 off.
Can I calculate both increase and decrease?+
Yes. The percentage change calculator handles both. Positive = increase, negative = decrease.