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Percentage Change Calculator

Calculate percent increase or decrease

Percentage Change

25.00%

Increase

+25.00

Final Value

125.00

Percentage Change

25.00%

Increase

Absolute Change

+25.00

Final Value

125.00

Value Comparison

Original Value100
New Value125
+25.00 (25.0%)

Formula

Percentage Change = ((New - Original) / Original) × 100

= ((125 - 100) / 100) × 100

= 25.00%

Formulas Used

Percentage Change

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

Calculate the percentage increase or decrease from an original value to a new value.

Where:

Original Value= The starting or baseline value
New Value= The updated or current value

Absolute Change

Absolute Change = New Value - Original Value

The raw numerical difference between the new and original values.

Where:

New Value= The updated value
Original Value= The starting value

Example Calculations

1Price Increase: $100 to $125

Inputs

Original Value100
New Value125

Result

Percentage Change25.00% Increase
Absolute Change+25.00
Final Value125.00

Percentage Change = ((125 - 100) / 100) × 100 = (25 / 100) × 100 = 25.00% Increase.

2Price Decrease: $200 to $150

Inputs

Original Value200
New Value150

Result

Percentage Change25.00% Decrease
Absolute Change-50.00
Final Value150.00

Percentage Change = ((150 - 200) / 200) × 100 = (-50 / 200) × 100 = -25.00%. The absolute percentage is 25.00%, shown as a Decrease.

Frequently Asked Questions

Q

How do you calculate percentage change?

Percentage change = ((New Value - Original Value) / Original Value) × 100. A positive result means an increase, negative means a decrease.

  • Gas from $3.20 to $3.85/gal = ((3.85 – 3.20) / 3.20) × 100 = 20.3% increase
  • Stock from $150 to $127 = ((127 – 150) / 150) × 100 = –15.3% decrease
  • Always use the original (starting) value as the denominator, not the new value
  • Convert the result to absolute value when labeling it simply as "increase" or "decrease"
Q

What is the difference between percentage change and percentage difference?

Percentage change compares a new value to an original value. Percentage difference compares two values without designating one as "original".

  • Percentage change has direction: old → new (e.g., Q1 revenue vs. Q2 revenue)
  • Percentage difference uses the average of both values as the denominator
  • Example: values 40 and 60 — % change from 40 to 60 = +50%, but % difference = 40%
  • Use % change for time-series data; use % difference for comparing two independent measurements
Q

Can percentage change be negative?

Yes! A negative percentage change indicates a decrease. For example, if a price drops from $100 to $80, that's a -20% change.

  • A home dropping from $400,000 to $360,000 = –10% change
  • Negative % change is common in stock markets — the S&P 500 fell –19.4% in 2022
  • A value can decrease by at most 100% (to zero), but can increase by any amount
  • To reverse a 20% loss, you need a 25% gain — losses and gains are not symmetric
Q

How do you calculate percentage increase?

Use the same formula: ((New - Original) / Original) × 100. If the result is positive, it's an increase. If negative, it's a decrease.

  • Rent from $1,200 to $1,350/mo = ($150 / $1,200) × 100 = 12.5% increase
  • Salary from $52,000 to $58,000 = ($6,000 / $52,000) × 100 = 11.5% increase
  • US median home price rose roughly 42% from 2019 ($320K) to 2024 ($455K)
  • Tip: multiply original by (1 + rate/100) to verify — $1,200 × 1.125 = $1,350

Understanding Percentage Change

Percentage change is a fundamental concept in finance, economics, and data analysis.

It helps compare values over time, track growth or decline, and make informed decisions.

The formula works for any two values, whether prices, quantities, or measurements.

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Last Updated: Mar 9, 2026

This calculator is provided for informational and educational purposes only. Results are estimates and should not be considered professional financial, medical, legal, or other advice. Always consult a qualified professional before making important decisions. UseCalcPro is not responsible for any actions taken based on calculator results.

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