Percentage Calculator

Calculate percentages, increases, decreases, and changes with ease.

Calculate Percentage

What is X% of Y?

Quick Examples

What is 15% of 200?
Result: 30
Increase 100 by 20%
Result: 120
50 is what % of 200?
Result: 25%

Understanding Percentages

Percentages are a way to express a number as a fraction of 100. They are commonly used in everyday life for discounts, interest rates, and statistics.

Common Percentage Calculations

Percentage of a Number

Formula: (Percentage × Total) ÷ 100
Example: 15% of 200 = (15 × 200) ÷ 100 = 30

Percentage Change

Formula: ((New - Old) ÷ Old) × 100
Example: Change from 100 to 120 = ((120-100)÷100) × 100 = 20%

Pro Tips

  • • To find 10% of a number, divide by 10
  • • To find 5% of a number, divide by 20
  • • To increase by 10%, multiply by 1.1
  • • To decrease by 10%, multiply by 0.9