Solve the three most common percentage problems instantly.
Percentage problems come in a few distinct forms, and it's easy to get confused about which formula applies to which question — finding what percentage one number is of another, finding a percentage of a number, or figuring out the percentage change between two values. Each requires a slightly different calculation, and mixing them up is one of the most common sources of everyday math mistakes.
This shows up constantly in real situations: calculating a discount at checkout, figuring out a tip, working out what percentage of a budget has been spent, or determining how much a value has grown or shrunk over time.
Select which type of percentage problem you're solving — what percentage X is of Y, what value is X percent of Y, or the percentage change from one number to another — enter your numbers, and get the instant result.
They are: finding what percent one number is of another, finding a specific percentage of a given number, and calculating the percentage increase or decrease between two values.
Percentage change is calculated as (new value − original value) divided by the original value, multiplied by 100, giving either a positive result for an increase or a negative result for a decrease.
Using the original value as the base reflects how much the number changed relative to its starting point, which is the standard convention for reporting growth or decline consistently.
Yes, by using the "percentage of a number" calculation to find the discount amount, then subtracting it from the original price, or by entering the values directly if the tool supports discount calculation.
Yes — percentage points refer to the raw arithmetic difference between two percentages (e.g., 40% to 50% is a 10 percentage point increase), while percent change describes that same difference relative to the original value (a 25% increase in this example).