Percentage Calculator
Calculate percentages, percentage changes, and determine what percent one number is of another.
How to use the Percentage Calculator
This calculator offers three different percentage calculations:
- Basic Percentage: Calculate a percentage of a number (e.g., 10% of 100)
- Percentage Change: Calculate the percentage increase or decrease between two values
- Percent of Value: Determine what percentage one number is of another
About Percentages
A percentage is a number expressed as a fraction of 100. It is often denoted using the percent sign, "%". For example, 45% (read as "forty-five percent") is equal to 45/100, or 0.45.
Percentage calculations are common in many areas, including finance (interest rates, discounts), statistics, academic grading, and many everyday situations like calculating tips or sales tax.
Common Percentage Formulas
- Finding a percentage of a value: (Value × Percentage) ÷ 100
- Calculating percentage change: ((New Value - Original Value) ÷ Original Value) × 100
- Finding what percent X is of Y: (X ÷ Y) × 100