Percentage Change Calculator
Calculate the percentage difference between two numbers. Determine the percent increase or decrease from an original value to a new value.
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About Percentages
A percentage is a number or ratio expressed as a fraction of 100. It is often denoted using the percent sign, "%". Percentages are used to express how large or small one quantity is relative to another.
Calculation Examples
| Type | Calculation | Result |
|---|---|---|
| Increase | 100 to 150 | 50% increase |
| Decrease | 200 to 150 | -25% decrease |
Common Formulas
- Percentage: (Part / Whole) × 100
- Percentage Change: ((New - Old) / Old) × 100
- Percentage Decrease: ((Old - New) / Old) × 100
Frequently Asked Questions
How do I calculate percentage change?
Percentage Change = ((New Value - Old Value) / Old Value) × 100. If positive, it's an increase. If negative, it's a decrease.
Why is percentage change important?
It helps track growth (like sales, population, prices) or decline over time in a standardized way.