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Free Calculator
Percentage Difference Calculator
Compare any two numbers and instantly see the percentage difference — symmetric comparison with full working shown.
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Percentage Difference
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Step-by-Step Solution
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Real-Life Examples — Click to Try
🏪 Two Store Prices
Store A: $25 vs Store B: $30
≈ 18.18%
📊 Test Score Comparison
Student A: 88 vs Student B: 72
≈ 19.9%
💸 Monthly Expenses
January $1,200 vs February $950
≈ 23.08%
Frequently Asked Questions
% Difference = (|V1 − V2| ÷ ((V1 + V2) ÷ 2)) × 100. Take the absolute difference, divide by the average, multiply by 100. Always positive.
Percentage change uses the original as reference and has direction (+/-). Percentage difference treats both values equally using their average — making it symmetric. Swap the values and get the same result.
|50−75| = 25; average = (50+75)/2 = 62.5; (25÷62.5)×100 = 40%.
Yes, percentage difference is widely used in science to compare two experimental measurements when neither is the "true" reference value. It is a neutral, symmetric measure.
Using the average makes the result symmetric — swapping V1 and V2 gives the same answer. If you used just V1, swapping would give a different result, which is biased.
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