Percent Change Calculator
Calculate the percent increase or decrease between two numbers.
Interactive calculator
Result
Change
25
Percent change
25%
What it is
Percent change measures growth or shrinkage between two values — sales growth, price changes, weight loss, anything.
The formula
% change = (New − Old) ÷ Old × 100
Why it matters
Understanding percent change calculator helps you make a better-informed decision before you commit money or time.
Worked examples
Try the example
Use the defaults above as a starting point — then adjust the inputs to match your situation.
Common pitfalls
- Double-check the units on every input — most errors come from mixing units.
- Round at the end, not in the middle of the formula.
Frequently asked questions
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