Percentage & Percentage Change Calculator
Calculate percentages easily: find X% of Y, determine what percentage X is of Y, and compute percentage change (increase or decrease) between two values.
How to Calculate Percentages
Percentages are used in everyday life, from calculating tax and discounts to tracking financial growth and statistics. This calculator handles three of the most common percentage computations:
1. Finding X% of Y
Use this to find a specific portion of a total. For example, if you want to know what 15% of a $80 bill is:
Formula: (X / 100) × Y
Example: (15 / 100) × 80 = 12
2. Finding What Percentage X is of Y
Use this to find the proportion of one number relative to another. For example, if you got 45 out of 60 marks on a test:
Formula: (X / Y) × 100
Example: (45 / 60) × 100 = 75%
3. Calculating Percentage Change (From A to B)
Use this to find the rate of increase or decrease between two values over time. For example, if a stock price goes from $100 to $150:
Formula: ((B - A) / |A|) × 100
Example: ((150 - 100) / 100) × 100 = 50% increase
Disclaimer: This calculator is for educational and learning purposes only. While we strive for accuracy, calculations are provided "as-is" without warranty. The accuracy of results depends on the accuracy of input data provided. Always verify important calculations independently. For critical applications or when accuracy is essential, consult with appropriate professionals or use verified reference sources. Educational calculators may contain rounding or approximations.