It is not difficult to learn how to calculate the percentage of one number vs. another number. All you have to do is divide one number by another number. Then, then take that number and move the decimal place two spaces to the right. This way you will get your percentage. Percentage calculator lets you do all calculations quickly. You can calculate the value of a percentage of a number by entering the percentage you seek of the number that you also enter and clicking "Calculate". You can also enter two numbers to calculate the percentage the first is of the second. Do not forget to click "Calculate" button.