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Percentage Difference Calculator

Calculate percentage difference between two numbers instantly. Compare values, find percentage change, and analyze increases or decreases accurately using our free Percentage Difference Calculator.

Compare two values and calculate percentage difference, percentage change, increase, or decrease instantly.

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How the Percentage Difference Calculator Works

1

Enter First Value

Enter the original or first number.

2

Enter Second Value

Enter the new or comparison number.

3

Calculate Difference

The calculator finds the absolute difference between values.

4

View Percentage Difference

See percentage difference, absolute difference, and change amount.

Percentage Difference Formula

|A - B| ÷ ((A + B) ÷ 2) × 100

Percentage difference measures how much two numbers differ relative to their average value. It is commonly used in mathematics, statistics, finance, research, and data analysis.

Example Calculation

Input: 100 and 120

Output: 18.18%

Common Uses

  • • Mathematics
  • • Statistics
  • • Finance
  • • Business Analysis
  • • Research
  • • Data Analysis
  • • Academic Studies
  • • Performance Comparison
  • • Market Analysis
  • • Scientific Calculations

Questions about this calculator

Percentage difference measures how much two values differ relative to their average.

Percentage difference equals the absolute difference divided by the average of the two values multiplied by 100.

Percentage change uses an original value as a reference, while percentage difference compares two values equally.

No. Percentage difference is always expressed as a positive value because it uses absolute difference.

It is used in statistics, finance, business, research, science, and education.

Percentage difference is used when comparing two observed values where neither is considered a standard or true benchmark. Percentage error is used when comparing an experimental result against a known theoretical or accepted true value.

Percentage difference compares two peer values

Use percentage difference when neither value is a designated starting value or reference. The absolute difference is divided by the average of the two values, making the result symmetric: swapping the first and second values does not change it.

Example

For 80 and 100, the absolute difference is 20 and the average is 90. The percentage difference is 20 ÷ 90 × 100 = 22.22%.

Difference versus percentage change

Percentage change measures movement from an old value to a new one and divides by the old value. Percentage difference instead compares two measurements without choosing a baseline. If both values are zero, the percentage form is undefined because their average is zero.

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Written & maintained by Aditya Singh

Aditya Singh is a software engineer and the founder of DevCalc, based in Uttar Pradesh, India. He builds and maintains every calculator on this site using documented formulas, worked examples, and clearly stated limitations, with careful attention to accuracy. Read more about the author →