Δ% Percentage Change Calculator
How It Works
Calculate percentage increase or decrease between two values. Get a clear result with the inputs shown on the page. Use Percentage Change Calculator to apply the displayed mathematical method to your values and see the result immediately.
The result is most useful when the inputs match the definitions used by this calculator. For this tool, the underlying method is: Percentage Change = ((New Value - Old Value) / Old Value) × 100. Compare the output with the worked example, then change one meaningful input at a time to see how the result responds.
Understanding Percentage Change
Percentage Change describes a mathematical relationship between the values entered in the calculator. Understanding the reference values and formula helps you interpret the result correctly.
Keep in mind: Check units, signs, reference values, and rounding conventions when using the result for an important calculation. Review the percentage change inputs and units before relying on the result.
When to Use This Calculator
Use Percentage Change Calculator to apply the displayed mathematical method to your values and see the result immediately.
Practical tip: For this Percentage Change Calculator, identify the reference values and units first, then change one meaningful input at a time so the effect on the result is clear.
Formula
Percentage Change = ((New Value - Old Value) / Old Value) × 100
Example
Price increased from $80 to $100: Change = ((100-80)/80) × 100 = 25% increase.