What is the difference between percentage change and percentage difference?

Percentage change compares to an original value, while percentage difference compares to the average of two values. Difference is used when neither value is the 'starting point'.

What is the formula for percentage difference?

Percentage Difference = (|Value 1 − Value 2| ÷ ((Value 1 + Value 2) ÷ 2)) × 100. It always gives a positive result.

When should I use percentage difference vs. percentage change?

Use percentage difference when comparing two independent values (e.g., prices of two products). Use percentage change when one value comes before the other (e.g., price this year vs. last year).

Percentage Difference Calculator

Find the percentage difference between two values.

How to use

1Enter Value 1 — The first number to compare.

2Enter Value 2 — The second number to compare.

3See the difference — The percentage difference is calculated using the average.

Value 1

Value 2

Result

50.00%

Percentage difference between 30 and 50 = 50.00%

0%100%

Step-by-step

1Absolute difference:|30 − 50| = 20

2Average:(30 + 50) ÷ 2 = 40

3Divide and multiply:20 ÷ 40 × 100 = 50.00%

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Understanding Percentage Difference

Percentage difference measures the relative gap between two values without treating either one as the "starting point." Unlike percentage increase or decrease — which compare a new value to an original — percentage difference uses the average of both values as the reference. This makes it ideal for comparing two independent measurements.

The Formula: (|V1 − V2| ÷ ((V1 + V2) ÷ 2)) × 100

When to Use Percentage Difference

Price comparison: One store sells a blender for $89, another for $119. The percentage difference is 28.85%, helping you see how far apart the prices are regardless of which you consider "base."
Scientific measurements: Two lab instruments measure a sample as 4.82g and 5.01g. The 3.87% difference indicates good agreement between instruments.
Performance metrics: Team A completed 145 tasks while Team B completed 168. The 14.70% difference quantifies the productivity gap neutrally.
Survey results: Region A reports 62% satisfaction vs. Region B's 74%. The percentage difference between these rates is 17.65%.

Difference vs. Change

Don't confuse percentage difference with percentage change. If you know which value came first (e.g., last year's revenue vs. this year's), use the Percentage Increase or Percentage Decrease calculator instead. Percentage difference is symmetric — swapping the two values gives the same result.

For a deeper exploration of percentage concepts, check out our complete guide to percentages.