Calculator Form
Example Data Table
| Case | Original | New | Signed Change | Percent Change |
|---|---|---|---|---|
| Sales growth | 80 | 100 | 20 | 25% |
| Price drop | 150 | 120 | -30 | -20% |
| Test score rise | 64 | 80 | 16 | 25% |
| Inventory shrink | 500 | 425 | -75 | -15% |
| Website traffic jump | 1200 | 1560 | 360 | 30% |
Formula Used
1) Standard percent change
Percent Change = ((New Value − Original Value) ÷ Original Value) × 100
2) Final value from known rate
Final Value = Original Value × (1 + Rate ÷ 100)
3) Original value from known rate
Original Value = Final Value ÷ (1 + Rate ÷ 100)
4) Percent change from change amount
Percent Change = (Absolute Change ÷ Original Value) × 100
5) Symmetric percent difference
Percent Difference = |A − B| ÷ ((|A| + |B|) ÷ 2) × 100
How to Use This Calculator
- Select the calculation mode that matches your problem.
- Enter the required numbers in the visible fields.
- Choose your preferred decimal precision.
- Click Calculate to show the result below the header.
- Review the summary cards, detailed table, and Plotly graph.
- Use the CSV or PDF buttons to export the result.
FAQs
What does percent change measure?
Percent change measures how much a value increased or decreased relative to its starting value. It shows the movement as a percentage of the original amount.
What is the difference between percent change and percent difference?
Percent change uses one value as the base. Percent difference compares two values symmetrically by using their average magnitude as the denominator.
Why can’t the original value be zero in percent change?
The standard formula divides by the original value. Division by zero is undefined, so a percent change cannot be computed from a zero starting point.
Can I use negative values?
Yes. The calculator accepts negative numbers. Results remain mathematically valid, though real-world interpretation may need extra care when the base value is negative.
How do I reverse a known percentage increase?
Choose the mode for finding the original value from a final value and percent rate. Enter the final value and the known rate to recover the starting value.
What does the multiplier mean?
The multiplier shows how many times the final value is compared with the original. For example, 1.25× means the final value is 25% larger.
What does the signed change tell me?
Signed change is the simple arithmetic difference between the final and original values. Positive means increase, while negative means decrease.
What do the export buttons save?
CSV exports the result table as spreadsheet-friendly text. PDF saves the visible result summary and details in a clean document layout.