How do I work out what X percent of Y is?
Type the percent in the first field and the number in the second, and read the first result line. The formula behind it is percent divided by 100, times the value: 15% of 200 is 0.15 x 200 = 30.
Is this percentage calculator free?
Yes, free with no signup. It recalculates on every keystroke, so there is not even a button to press.
What is 20% of 150?
30. Twenty percent is one fifth, so divide by 5. The calculator confirms it: enter 20 and 150 and the first line reads 30, with 150 plus 20% (180) and minus 20% (120) below it.
Can it tell me what percent one number is of another?
Yes, that is what the Compare field is for. With a value of 200 and a compare figure of 50, it reads 25 percent. The tool also shows the value with the percentage added and subtracted, which is the other common reason people open a percentage calculator.
How do I find what percentage one number is of another?
Divide the part by the whole and multiply by 100. For 30 out of 200 that is 30 / 200 x 100 = 15%. You can verify it here by entering 15 as the percent and 200 as the value, which returns 30.
Why does typing 1,000 give me 0?
The field is parsed with JavaScript's Number(), which rejects thousands separators and currency symbols. A comma turns the whole entry into NaN, and the tool falls back to 0. Enter 1000 with no comma.
Is 15% of 200 the same as 200% of 15?
Yes, both are 30. Multiplication is commutative, so you can swap the two fields whenever the reversed version is easier to do in your head. It is the reason 18% of 50 is best computed as 50% of 18.
How do I reverse a percentage, for example find the price before 20% was added?
Divide by 1 plus the percentage as a decimal. A total of 120 that already includes a 20% addition came from 120 / 1.2 = 100. This tool only works forward, so do that division yourself.
Does any number I type reach a server?
No. The entire calculation is a few lines of arithmetic running in your browser tab. Nothing is sent anywhere, and the tool keeps working with the network disconnected.
How do I calculate the percentage increase between two numbers?
That is a different formula: the change divided by the starting value, times 100. Going from 80 to 100 is a 25% increase. Use the Percentage Change Calculator for that job; this page computes percentages of a single value.
How do I take a percentage off a price?
Enter the discount percent and the price, and read the minus line: 200 minus 15% is 170. Equivalently, multiply the price by 1 minus the percent as a decimal, 200 x 0.85. For a version with dedicated price and savings fields, use the Discount Calculator.