PERCENTAGECHANGECALCULATOR
Calculate any percentage increase or decrease instantly. Enter your percentage and number below.
What is a Percentage Increase/Decrease?
A percentage increase or decrease calculates the new value after adding or subtracting a percentage from an original number. Essential for price changes, salary adjustments, investment returns, discounts, and inflation effects.
How to Calculate Percentage Change
Multiply the original number by the percentage, then add (increase) or subtract (decrease) from the original.
Calculate the change amount
Multiply the original number by the percentage divided by 100
Apply the change
Add for an increase, or subtract for a decrease
Get the new value
The result is your new value after the percentage change
The Formulas
For a 20% increase on 80: 80 × 1.20 = 96. For a 20% decrease on 80: 80 × 0.80 = 64.
Tips & Best Practices
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A 100% increase doubles the original value
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A 50% decrease halves the original value
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VAT at 20% means the price increases by a factor of 1.20
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To reverse a discount, divide by (1 - discount percentage)
Frequently Asked Questions