Percentage Increase & Decrease
Local ProcessingCalculate the percentage growth from an original value to a new higher value.
How It Works & Processing Standards
Enter values above to calculate results automatically. Check each input field for guidance and units.
Example: Initial Value = 100, New Value = 125 → 25
Tool processing runs in your browser. If you create a calculator or conversion share link, its values are included in the URL. See the privacy policy for account, analytics and advertising data.
Finds how many percent a new value rose or fell compared with the old value. Choose increase or decrease under "Calculation".
What You Can Do
- Percent increase
- (new − old) ÷ old × 100. A drop shows as a negative number.
- Percent decrease
- (old − new) ÷ old × 100. Shows the drop as a positive number.
How to Use Percentage Increase & Decrease
- 1Choose a calculationPick increase to see growth or decrease to see a drop.
- 2Enter old and new valuesThe old value is the reference. It cannot be 0.
- 3Read the resultThe result is in percent. Copy it or keep it with a share link.
Examples
Common Use Cases
- Month-over-month or year-over-year sales changes
- How much a price dropped after a discount
- Reporting changes in visitors or subscribers
Frequently Asked Questions (FAQ)
Does +50% then −50% bring me back to the start?
No. 100 becomes 150, and 50% less than 150 is 75, because the decrease is measured from the new value.
How is this different from percentage points?
A rate going from 2% to 3% is a 50% increase but a 1 percentage-point difference. This tool calculates the percent change.