Enter the original value
Type the starting number.
Calculators
Percentage Change Calculator
Free online percentage change calculator
Enter the values
Local processingThe difference is divided by the original value and multiplied by 100.
Result
The result will appear here after you run the tool.
Press Ctrl or Command and Enter to run the tool.
About this tool
About this tool
Percentage Change Calculator divides the difference between the new and original values by the original value and multiplies by 100, preserving the sign. A positive result is an increase and a negative result is a decrease, both clearly labeled.
Find the percentage change between any two numbers, whether the value went up or down. Enter the original and new values, and the calculator returns a signed percentage with the direction labeled, plus the absolute difference and the formula. Handles both increases and decreases in one tool.
Built for daily work
- Measure a stock or index move between two days.
- Track month-over-month website traffic changes.
- Compare sales figures across periods.
- Calculate how much a bill went up or down.
How to use this tool
How to use this tool
Enter the new value
Type the number it changed to, higher or lower.
Read the change
The signed percentage appears with the direction, the difference, and the formula.
Key features
Key features
Both directions supported
Increases and decreases are handled in one tool with clear labels.
Signed output
The sign of the result makes the direction explicit at a glance.
Difference included
The absolute change is shown alongside the percentage.
Local calculation
The math runs in your browser with no upload.
Practical use cases
Practical use cases
- Measure a stock or index move between two days.
- Track month-over-month website traffic changes.
- Compare sales figures across periods.
- Calculate how much a bill went up or down.
- Report any before-and-after percentage comparison.
Private by default
For local tools, input is processed in your browser and is not sent to application analytics.
Data processing noticeTechnical details
Technical details
ProcessingLocal browser processing
Formula(new - original) / original x 100
OutputSigned percentage change and difference
PrivacyValues never leave the browser
Limitations and important notes
Limitations and important notes
- Percentage change from a very small base can be misleadingly large.
- The original value cannot be zero.
- The tool measures a single change, not a trend over multiple periods.
Frequently asked questions
Frequently asked questions
It is a decrease. The tool labels the direction so the sign is never ambiguous.
This tool accepts both directions, while the increase tool is focused on upward changes.
No. A zero original value makes the change undefined.
Yes, the result includes the expression used, so it is easy to verify.
Related guides and solutions
Related guides and solutions
Calculate a percentage increase in seconds
Salary changes, price rises, revenue growth, and cost increases are all percentage increase questions. Enter the original and new values, and the calculator returns the percentage increase with the difference and the formula.
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