Percentage Increase and Decrease Calculator
Increase or decrease any value by a percentage and see the change amount and both results.
Method and limitations · Report an error
Method
How it works
To increase or decrease a value by a percentage, multiply the original value by the percentage divided by 100. Add that change amount for an increase or subtract it for a decrease.
Both results use the same original value as their base. This calculator applies a stated percentage adjustment; it does not infer the percentage change between two separate observed values.
Common questions
Frequently asked questions
What is the percentage increase formula?
Increased value equals original value multiplied by one plus the percentage divided by 100.
What is the percentage decrease formula?
Decreased value equals original value multiplied by one minus the percentage divided by 100.
Is improvement percentage the same as percentage increase?
When both use the same original baseline and a higher result represents improvement, the calculation is the same percentage-change formula.
Why does reversing the same percentage not restore the original?
After the first change, the second percentage uses a different base, so equal percentage rates produce different absolute amounts.
Not financial advice. This calculator is for general informational purposes only. Check figures independently before making financial decisions.