Calculate the percentage increase or decrease between two values.
What is Percentage Change?
Percentage change is a mathematical concept used to describe the relationship between an old value and a new value. It expresses the difference as a percentage of the original number.
- Percentage Increase: When the final value is higher than the initial value (e.g., a stock price going up).
- Percentage Decrease: When the final value is lower than the initial value (e.g., a discount on a retail item).
The Formula for Percentage Change
To calculate the percentage change manually, you can use the following formula:
Percentage Change = [(Final Value – Initial Value) / |Initial Value|] × 100
Step-by-Step Calculation:
- Subtract the Initial Value from the Final Value to find the “Absolute Change.”
- Divide that change by the absolute value of the Initial Value.
- Multiply the result by 100 to get the percentage.
Example: If a product originally cost R500 and the price increased to R650:
- Step 1: 650 – 500 = 150
- Step 2: 150 / 500 = 0.3
- Step 3: 0.3 × 100 = 30% increase.
Common Uses for this Calculator
- Business & Finance: Calculating year-on-year revenue growth or loss.
- Shopping: Figuring out the true discount percentage during a sale.
- Investments: Tracking the performance of your stock portfolio or crypto assets.
- Demographics: Measuring population growth or decline in a specific area.
- Health: Monitoring changes in body weight or blood pressure over time.
Difference Between Percentage Change and Percentage Point Change
It is important not to confuse “Percentage Change” with “Percentage Points.”
- Percentage Change measures the rate of change relative to the original number.
- Percentage Point Change is simply the arithmetic difference between two percentages (e.g., moving from 10% to 15% is a 5-percentage point increase, but a 50% percentage change).
Why Use Our Tool?
Manual calculations can lead to errors, especially when dealing with negative numbers or small decimals. Our Percentage Change Calculator automates the process, providing you with the Absolute Change, the Percentage Change, and identifying whether it is an Increase or Decrease instantly.