Math and Education
Percentage Change Calculator
Percentage Change Calculator calculate the absolute and percentage change between an original value and a new value, with increase or decrease direction.
Math and Education
Percentage Change Calculator
Calculate the absolute and percentage change between an original value and a new value, with increase or decrease direction.
Formula
Percentage change = (new value - original value) / |original value| x 100%.
About the Percentage Change Calculator
Calculate the absolute and percentage change between an original value and a new value, with increase or decrease direction.
How the Percentage Change Calculator Works
The signed difference is divided by the magnitude of the nonzero original value, so decreases remain negative even when the starting value is negative.
Formula
Percentage change = (new value - original value) / |original value| x 100%.
The calculation runs in your browser. Values are validated for required ranges, compatible units, and method-specific restrictions before results are displayed.
Required Inputs
- Original value (required).
- New value (required).
Results Reported
The result panel reports the final answer and the intermediate quantities needed to check the calculation:
- Percentage change (%)
- Absolute change
- Direction
- New-to-original factor
Percentage Change Calculator Example
Select Example Data in the calculator to load this reproducible input set:
| Input | Example value |
|---|---|
| Original value | 80 |
| New value | 100 |
How to Use the Calculator
- Confirm that the calculator title and formula match the quantity you need.
- Enter every required value using the unit shown with its field.
- Select Example Data to inspect a valid input set, or enter your own values and select Calculate.
- Review all reported values and the displayed formula before using the answer.
- Use Copy Result or Download CSV when you need a reusable record.
Accuracy and Limitations
The original value cannot be zero because a percentage change from zero is undefined. Use percentage-point change for two percentages when that is the intended comparison.
Keep units consistent, use measurements that represent the actual situation, retain full precision during the calculation, and round only the final answer. Professional decisions may require current official rules, field measurements, laboratory methods, or specialist review.
Frequently Asked Questions
What does the Percentage Change Calculator calculate?
Calculate the absolute and percentage change between an original value and a new value, with increase or decrease direction.
Which formula does the Percentage Change Calculator use?
Percentage change = (new value - original value) / |original value| x 100%. The signed difference is divided by the magnitude of the nonzero original value, so decreases remain negative even when the starting value is negative.
What should I check before using the Percentage Change Calculator result?
The original value cannot be zero because a percentage change from zero is undefined. Use percentage-point change for two percentages when that is the intended comparison.