A Bachelor of Science is an undergraduate academic degree awarded for completed courses that generally last three to five years, or a person holding such a degree. The first university to admit a student to the degree of Bachelor of Science was the University of London in 1860. Prior to this, science subjects were included in the BA bracket, notably in the cases of mathematics, physics, physiology, and botany.

Whether a student of a particular subject is awarded a Bachelor of Science degree or a Bachelor of Arts degree can vary between universities. For example, an economics degree may be given as a Bachelor of Arts (BA) by one university but as a BS by another, and some universities offer the choice of either. Some liberal arts colleges in the United States offer only the BA, even in the natural sciences, while some universities offer only the BS, even in non-science fields.

At universities that offer both BA and BS degrees in the same discipline, the BS degree is usually more extensive in that particular discipline and is targeted toward students who are pursuing graduate school or a profession in that field.

In India, it is generally a three-year course, however, at some places, it is integrated with another short term course, certification, or ‘honors’, making it a four-year course. After passing the 12th standard, also known as ‘intermediate’ in Physics, Chemistry, Mathematics, and/or Biology from a recognized board (a central board or state board), a student can apply to a college for B.Sc. It is an undergraduate degree, which could either be offered in an annual examination system (3 years) or semester system (6 semesters, odd semester typically lasts from July/August to December, and even semester typically lasts from January to May). All the major colleges and universities offer this course. After getting a B.Sc. Degree, the students can choose to either continue their education and pursue post-graduation, or leave the college and take up a relevant job.