Share of total
Input: 45 out of 180
Result: 25%
Percentage Calculator
Calculate percentage changes, increases, decreases, and ratios with ease. Find what percent one number is of another or calculate percentage differences.
Percentage Change
Result
50% Change
Change Value: 50
Percentage of Value
25% of 200 is
50
Formula and decision logic
Percentage calculations usually compare a part to a whole or compare the change between an old value and a new value.
Part as percent = part / whole × 100
Percent change = (new - old) / old × 100
Worked examples
Growth rate
Input: 120 -> 150
Result: 25% increase
How to use this calculator
- 1Choose the type of percentage calculation
- 2Enter the required values
- 3View the calculated percentage result
How to read the result
- Percentage change is relative, so the same absolute difference can create very different percentage results.
- Negative percentages usually mean decline, discount, or loss compared with the base value.
Common input mistakes
- Dividing by the new value instead of the original value when measuring change.
- Confusing percentage change with percentage points.
Frequently asked questions
How do I calculate percentage change?
Enter the original value and the new value. The calculator will show the percentage increase or decrease.
Can I find what percentage one number is of another?
Yes, enter the part and the whole to find what percentage the part represents.
What is the difference between percentage change and percentage point?
Percentage change is relative to the original value, while percentage point is the absolute difference between two percentages.