Percentage Change Calculator

Calculate percentage increase or decrease between two values. Free online percentage change calculator.

The Percentage Change Calculator determines the relative change between two values as a percentage. Whether tracking investment growth, price changes, population shifts, or performance metrics, understanding percentage change is crucial for data analysis. Simply enter your original and new values to instantly see the percentage increase or decrease with clear positive or negative indication.

Common use cases

  • Tracking investment returns
  • Analyzing sales growth or decline
  • Monitoring weight loss or gain
  • Comparing year-over-year metrics
  • Evaluating price changes over time

How to use

  1. Enter the original (starting) value
  2. Enter the new (ending) value
  3. Click calculate for the percentage change
  4. See whether it's an increase or decrease
  5. View the calculation formula used

FAQ

How is percentage change calculated?

((New - Original) ÷ Original) × 100. Positive results indicate increase, negative indicate decrease.

What if the original value is zero?

Percentage change from zero is undefined mathematically. You'd need a different metric for this case.

Is a 50% decrease the same as a 50% increase reversed?

No. If 100 decreases by 50% to 50, you need a 100% increase to return to 100.

How do I calculate compound percentage changes?

Apply each percentage change sequentially to the running total, or calculate the overall multiplier.