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Percentage Calculator

Quickly calculate percentages for various scenarios.

Math
Percentage Calculator

Calculate a percentage of a number.

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Master Percentages with Ease

Percentages are a fundamental part of everyday life, used in everything from calculating discounts and tips to understanding statistics and financial reports. This versatile calculator handles three of the most common percentage calculations, making them simple and straightforward.

Formulas Explained

  1. What is X% of Y?
    • Formula: Result = (X / 100) * Y
    • This answers questions like "What is a 15% tip on a $50 bill?"
  2. X is what % of Y?
    • Formula: Result = (X / Y) * 100
    • This answers questions like "I scored 45 out of 50 on a test. What is my percentage?"
  3. What is the percentage change from X to Y?
    • Formula: Result = ((Y - X) / X) * 100
    • This answers questions like "My investment grew from $1000 to $1200. What was the percentage increase?"

How to Use the Calculator

Simply select the tab that matches the question you want to answer, input your numbers into the designated fields, and the calculator will provide the result.

Real-World Examples

  • Calculating a Discount: You see a shirt that costs $40 and is on sale for 25% off.
    • Using the 'X% of Y' tab: (25 / 100) * 40 = $10. You save $10, and the final price is $30.
  • Calculating a Test Score: You answered 38 questions correctly on a 50-question exam.
    • Using the 'X is what % of Y' tab: (38 / 50) * 100 = 76%.
  • Calculating Growth: Your website traffic went from 5,000 visitors last month to 6,500 this month.
    • Using the '% Change' tab: ((6500 - 5000) / 5000) * 100 = 30% increase.

Frequently Asked Questions (FAQ)

  • What's the difference between a percentage and a percentage point? A percentage is a ratio of a number. A percentage point is the arithmetic difference between two percentages. For example, if your interest rate goes from 4% to 5%, it has increased by one percentage point, but it's a 25% increase.
  • How do I calculate a percentage decrease? The percentage change formula works for both increases and decreases. If the result is a negative number, it represents a percentage decrease.
  • Can I use this for calculating tips? Yes, the 'X% of Y' function is perfect for quickly calculating a tip for a restaurant bill or service.