Everyday math
Percentage change
Compare a new value with a positive original value, showing the difference and percentage increase or decrease.
Your inputs
Complete the fields for your selected method. Zero means intentionally zero, not unknown. Currency selection labels amounts; it does not convert exchange rates.
How this calculation works
change = new - original; percentage change = change / original × 100
Ordinary percentage growth requires a positive starting value here. Negative or zero starting values still show a numerical difference; percent change across such baselines can be misleading. This is not percentage-point change.
What information do I need?
Use records for the same job, equipment or accounting period. Only the fields for your selected entry method are required. An unknown amount is not zero.
Input definitions and where to find them
- Original value: Use matching records or a clearly stated assumption for the indicated period. Prefilled figures are illustrative. An unknown value is not zero.
- New value: Use matching records or a clearly stated assumption for the indicated period. Prefilled figures are illustrative. An unknown value is not zero.
Use the Where to find this value controls beside the inputs for available work-it-out helpers. Estimates remain your assumptions; a helper does not verify the source figures.
Worked example
Example amounts use US dollars (USD).
Example answer: Numerical change is 20.00 for the illustrative inputs below.
Example inputs
- Original value: 100.00
- New value: 120.00
- Numerical change
- 20.00
- Percentage change
- 20.0000 %
- Direction
- Increase
These illustrative values are not recommended rates or industry averages. Replace every example input with your own figures.
Use the result well
Compare a new value with a positive original value, showing the difference and percentage increase or decrease.
Keep inputs on the same scope and time basis. Calculations retain precision internally; displayed values generally round to two decimal places, with extra precision for very small values and whole-unit rounding where required. Economic comparisons describe your supplied assumptions and do not guarantee future results.
This tool provides business arithmetic. It does not approve engineering designs, establish legal or tax treatment, select equipment or certify safe operating conditions.