What is 20 Percent of 400

This calculator provides an easy method to solve percentage calculations such as what is 20 Percent of 400. See explanation below.


What is% of


What are Percentages?


How to Solve?


In this example, the number 400 represents the whole and so, as a percentage, it would be equal to 100%. Written as a ratio, we would get: 100% : 400

If a student took a 400 question test and they got every answer correct, as a percentage they would get a 100% score on the test.

In our problem we have to evaluate the 20 percent of 400. For now, let’s call this unknown value "Y". Written as a ratio, we would get: 20% : Y

To see a relationship between these two ratios, let’s combine them into an equation: 100% : 400 = 20% : Y


"400 : 100% and Y : 20%" is correct.
"400 : 100% and 20% : Y" is wrong.

Let’s solve the equation for Y by first rewriting it as: 100% / 400 = 20% / Y

Drop the percentage marks to simplify your calculations: 100 / 400 = 20 / Y

Multiply both sides by Y to transfer it on the left side of the equation: Y ( 100 / 400 ) = 20

To isolate Y, multiply both sides by 400 / 100, we will have: Y = 20 ( 400 / 100 )

Computing the right side, we get: Y = 80

This leaves us with our final answer: 20% of 400 is 80