Percentage Change Calculator
Calculate the percentage increase or decrease from one value to another. Works for prices, scores, populations — any two numbers.
Enter your values
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Original
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New value
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Difference
Frequently asked questions
How do I calculate percentage increase? ›
Subtract the original from the new value, divide by the original, then multiply by 100. Formula: ((New − Old) ÷ Old) × 100. Example: from 80 to 100 → ((100 − 80) ÷ 80) × 100 = 25% increase.
How do I calculate percentage decrease? ›
Use the same formula — a negative result means a decrease. Example: from 100 to 75 → ((75 − 100) ÷ 100) × 100 = −25%, which is a 25% decrease.
What is the difference between percentage change and percentage difference? ›
Percentage change goes from a specific starting point to an ending point — it has a direction (increase or decrease). Percentage difference is the absolute difference between two values relative to their average — it has no direction. Use percentage change for before/after comparisons; use percentage difference when comparing two values without a clear "original."
About this percentage change calculator
Percentage change measures how much a value has grown or shrunk relative to its starting point. It's widely used to compare prices over time, test score improvements, population growth, investment returns, and business metrics like revenue or user counts.
The formula is: ((New Value − Original Value) ÷ Original Value) × 100. A positive result is an increase; a negative result is a decrease.