Learning how to calculate the percentage of one number vs. another number is easy. If you want to know what percent A is of B, you simple divide A by B, then take that number and move the decimal place two spaces to the right. That's your percentage!

To use the calculator, enter two numbers to calculate the percentage the first is of the second by clicking Calculate Percentage. You may also calculate the value of a percentage of a number by entering the percentage you seek of the number you also enter and then clicking Calculate % Value. This app is free to use, so send it to your friends!

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Formula used to solve percentage problems that relates two ratios where one of the ratios is a part or portion per 100 and the other ratio is a part or portion per a whole.

Where:

A% of B is C as in: 10% of 90 is 9 where A=10, B=90, C=9

The percentage formula is:

A/100 x B = C as in: 10/100 x 90 = 9

Rearranging:

A 100 =
C B
as in:
10 100 =
9 90

The percentage formula is sometimes expressed as:

percent 100 =
is(part) of(whole)
as in: 10 100 = 9 90

Solving for each of the variables yields:

A = (C / B) x 100 as in: A = (9 / 90) x 100 = 10

B = C / (A / 100) as in: B = 9 / (10 / 100) = 90

C = (A / 100) x B as in: C = (10 / 100) x 90 = 9

Note: A% = A/100 because % means per 100