Percentage Calculator
Calculate percentages - X% of Y, percentage increase/decrease, percentage difference, and finding the original value before a change.
Choose the type of percentage calculation you need - each is clearly labeled with its own inputs and formula.
Percentage increase/decrease and percentage difference are calculated differently - increase/decrease is relative to the original value, while difference treats both values symmetrically.
Which Calculation Do You Need?
X% of Y finds a portion of a value. Percentage increase/decrease finds how much a value changed, relative to its original value. Percentage difference compares two values symmetrically (neither is treated as "original"). Find the original value works backward from a final value and a known percentage change.
How to Use It
- Choose the calculation type that matches what you need.
- Enter the relevant numbers.
- View the result along with the formula used.
Handling Division by Zero
Percentage change from zero is undefined (you can't express a change relative to nothing) - this tool clearly reports that case rather than showing an incorrect number like Infinity or NaN.