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How to Calculate Percentage Change

Find the percentage increase or decrease between two values.

The Formula

((New-Old)/Old) × 100

The percentage change formula uses the mathematical relationship: ((New-Old)/Old) × 100. Each variable in the formula represents a measurable quantity that affects the final result.

Step-by-Step Method

  1. 1Identify all input values needed for the percentage change calculation.
  2. 2Substitute your known values into the formula: ((New-Old)/Old) × 100.
  3. 3Perform the arithmetic operations in the correct order (PEMDAS/BODMAS).
  4. 4Check that your result has the correct units and is within a reasonable range.
  5. 5Verify using the interactive Percentage Change Calculator to confirm your answer.

Related Topics

percentage changepercent increase

Use the Interactive Calculator

Skip the manual math — get instant results with our free Percentage Change calculator.

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