Online Percentage Calculator
To calculate a percentage directly, you need to multiply the two numbers together and divide the result by 100, based on the following formula: A x B / 100. For example, if we want to know what 30% of 150 is, we simply multiply 30 x 150 and then divide by 100. So we get 4500 (that is, the product of 30 x 150) / 100 = 45. The concept is straightforward: we take 30 units of a number divided into 100 parts; in practice, we consider 1 hundredth of 150 which equals 1.5 and calculate the desired percentage (in this case, 30) by performing a multiplication. So we get 1.5 x 30 = 45.
The same result is obtained using the proportion "A : C = B : 100", where A represents the unknown we want to find, C is the total, and B is the number that quantifies the percentage (100). The ratio between the two numbers will be A : 150 = 30 : 100. Since in proportions the product of the means (30 and 150) equals the product of the extremes (A and 100), to find the unknown A we need to multiply 30 x 150 and divide the result by 100, obtaining 4500 : 100 = 45. Another way to explain the concept is to convert the percentage into a fraction (30% = 30 / 100, where 30 is the numerator and 100 is the denominator) and multiply it by the total (0.3 x 150).
On this page, alongside the first calculator (the most used one), 9 more have been added, each of which shows the formula used and the explanation of the result, making use of both Direct Percentage Calculation and Inverse Percentage Calculation.
Note: for decimals use a period (.), not a comma (,). To format results with thousands separators, use the small button with the dollar symbol which turns into a hash (#). Finally, please note that clicking or tapping the white box where the extended result is shown will copy it to the device clipboard, so you can paste it into a file.