Percentage Change Calculator

Percentage Change Calculator

A free online calculator to find the percentage increase or decrease between two values. Used by businesses tracking growth rates, students analyzing data changes, and professionals measuring performance metrics.

Percentage Change Calculator

Calculate percentage increase or decrease between two values.

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Original Value

New Value

Calculate→

For example, if a value changed from 50 to 75, enter 50 as the original value and 75 as the new value. The result is a 50% increase.

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Result =

Enter values to see result

How to Calculate Percentage Change

To calculate percentage change, subtract the original value from the new value, divide by the original value, and multiply by 100:

Formula: Percentage Change = ((New Value - Original Value) / Original Value) × 100

• Positive result = Percentage increase
• Negative result = Percentage decrease

Examples

• 50 to 75: ((75 - 50) / 50) × 100 = 50% increase
• 100 to 80: ((80 - 100) / 100) × 100 = -20% decrease
• 200 to 250: ((250 - 200) / 200) × 100 = 25% increase
• 80 to 60: ((60 - 80) / 80) × 100 = -25% decrease

Common Uses

Business & Finance

• Calculate revenue growth rates
• Track sales performance changes
• Measure profit margin variations
• Analyze stock price changes

Statistics & Analytics

• Compare year-over-year growth
• Measure data fluctuations
• Track KPI changes
• Analyze trends over time

Everyday Applications

• Calculate price increases
• Track weight loss/gain percentages
• Measure temperature changes
• Compare before/after values

Real World Examples

Example 1: Sales Growth

If sales increased from $50,000 to$65,000:

• Percentage change: ((65,000 - 50,000) / 50,000) × 100 = 30% increase

Example 2: Price Reduction

If a product’s price dropped from $120 to$90:

• Percentage change: ((90 - 120) / 120) × 100 = 25% decrease

Example 3: Population Growth

If a city’s population grew from 500,000 to 575,000:

• Percentage change: ((575,000 - 500,000) / 500,000) × 100 = 15% increase

Quick Reference Table

Original	New	Change
100	120	+20%
100	80	-20%
50	75	+50%
200	150	-25%
80	100	+25%

Understanding Percentage Change

• Always use the original value as the base (denominator)
• Positive results indicate growth or increase
• Negative results indicate decline or decrease
• A 100% increase means the value doubled
• A 50% decrease means the value is cut in half

Frequently Asked Questions

How do I calculate percentage increase?

Subtract the original from the new value, divide by the original, and multiply by 100. For example: (75 - 50) / 50 × 100 = 50% increase.

What’s the difference between percentage change and percentage difference?

Percentage change uses the original value as the base, while percentage difference typically uses the average of both values. This calculator uses percentage change.

Can percentage change be negative?

Yes, a negative result indicates a percentage decrease. For example, going from 100 to 80 is a -20% change (20% decrease).

How do I calculate year-over-year growth?

Enter last year’s value as the original and this year’s value as the new value. The result shows your year-over-year growth percentage.

What does a 100% increase mean?

A 100% increase means the value doubled. For example, increasing from 50 to 100 is a 100% increase.

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