To calculate a percentage, divide the part by the whole and then multiply the result by 100. The formula is: Percentage = (Part ÷ Whole) × 100 . For example, if you scored 45 out of 60 marks, the percentage would be (45 ÷ 60) × 100 = 75%. Learn how to take out percentage of marks with step-by-step formula, examples, and tips. Ideal guide for school, college, and IGNOU students. This free percentage calculator computes a number of values involving percentages , including the percentage difference between two given values. A percentage is a number or ratio that's represented as a fraction of 100. Learning how to calculate a percentage is a useful skill across many job roles. In this article, we show you how to calculate a percentage and offer examples to use as a guide.