What's the difference between "percentage change" and "increase/decrease by percentage"?
"Percentage change" takes two values (before and after) and gives you the percentage of the difference between them. "Increase/decrease by percentage" is the reverse: you enter a value and a percentage, and get the new value after applying it — useful for calculating a discount or price increase, for example.
How do I calculate a discount percentage on a product?
Use "increase/decrease by percentage" mode, enter the original price, the discount percentage, and choose "decrease" to get the price after the discount directly along with the amount saved.
Why does the percentage change sometimes show as negative?
A negative sign means the value decreased, while positive means it increased. The calculator also clarifies this with the word "increase" or "decrease" next to the number to avoid any confusion.
Can decimal or negative numbers be used?
Yes, all modes accept decimal numbers, and some accept negative numbers (like the percentage change mode) as long as the base value isn't zero (to avoid dividing by zero).
