What is "Percentage Change"?
Percentage change represents the degree of change over time. It is used for many purposes in finance, often to represent the price change of a security.
How do I calculate a discount?
Use the "What is X% of Y?" mode. Enter the discount percentage as X and the original price as Y. The result is the discount amount.
Is it free?
Yes, this tool is 100% free to use for any number of calculations.
Is it accurate?
Yes, it uses precise floating-point math to ensure accuracy up to many decimal places.
Can I use decimals?
Yes, decimal inputs (e.g., 12.5) are fully supported for precise calculations.
What is the difference between "Percentage of" and "Percentage off"?
"Percentage of" calculates a portion of a whole, while "Percentage off" calculates a discount and subtracts it from the original amount.
How do I calculate a tip?
Enter the bill amount as the Total Value (Y) and the tip percentage (e.g., 15) as the Percentage. The result is the tip amount.
Can I calculate percentage increase?
Yes, use the Percentage Change mode. If the result is positive, it is an increase; if negative, it is a decrease.
What if my percentage is over 100%?
The calculator handles percentages greater than 100% correctly (e.g., 200% of 50 is 100).
Does it work with negative numbers?
Yes, the calculator supports negative values for calculating changes or portions of debts/losses.