How it works
Use a positive original value. A positive result means an increase and a negative result means a decrease. From 100 to 125, the difference is 25 and the increase is 25%.
Inputs and units
| Input | Example value | What to enter |
|---|---|---|
| Original value | 100 | Enter a numeric value. Must be greater than zero. |
| New value | 125 | Enter a numeric value. |
Worked example
Show example inputs and results
This example is generated by the same calculation engine using the starting values in the form. Your own inputs produce your own result.
- Original value
- 100
- New value
- 125
Complete example results
- Percentage change
- 25 %
- Difference
- 25
Reading the result
Use quantities on the same basis. The starting value in percentage change, the denominator in a ratio and the length unit in geometry determine the meaning of the answer. Check the formula conditions alongside the example.
Questions and answers
Can I use the example values for my own calculation?
The example values illustrate the calculation. Replace every input with your own information, especially dates, rates and the selected operation.
Can the original value be zero?
No. Percentage change divides by the original value, so a zero base has no defined percentage change. This calculator also excludes negative bases to avoid ambiguous interpretations.
Why are some results rounded?
Results display up to 8 decimal places. Calculations use the unrounded values; very small values use scientific notation. JavaScript floating-point arithmetic can introduce tiny rounding differences.
Are my inputs sent to a server?
The calculator processes inputs in your browser. Its code does not send your values to a server.