This free percentage calculator computes a number of values involving percentages , including the percentage difference between two given values. Percentages are a fundamental part of quantitative aptitude and play a crucial role in various competitive exams and placement tests. Although the basic concept is simple, percentage problems are often combined with other topics to make them more challenging. 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. Learn how to take out percentage of marks with step-by-step formula, examples, and tips. Ideal guide for school, college, and IGNOU students.