A BS is a Bachelor of Science, a four-year undergraduate degree that emphasizes technical, analytical, and scientific coursework. It’s one of the two most common bachelor’s degrees awarded in the United States, alongside the Bachelor of Arts (BA). Most BS programs require 120 to 128 credit hours and take four years of full-time study to complete.
What a Bachelor of Science Covers
A BS degree is built around hard skills and specialized knowledge in a particular field. Where a Bachelor of Arts program leans toward broad exploration, with generous room for electives in subjects like literature, philosophy, or foreign languages, a BS curriculum is more rigid. You’ll spend a larger share of your credits on courses directly tied to your major, with a heavier emphasis on math, science, and problem-solving.
That doesn’t mean you skip general education entirely. BS students still take humanities and social science courses, but there’s less flexibility to wander into unrelated electives. If your program requires 120 credits total, more of those credits are locked into your major’s sequence than they would be in a BA program.
Common BS Majors
Bachelor of Science degrees are most closely associated with STEM fields (science, technology, engineering, and math), but they extend well beyond the lab. Some of the most popular fields that typically award a BS include:
- Business and management: Accounting, finance, marketing, and supply chain management are frequently offered as BS programs, especially when the curriculum includes statistics, economics modeling, or data analysis.
- Health professions: Nursing, health information management, public health, and pre-medical tracks almost always lead to a BS.
- Biological and biomedical sciences: Biology, biochemistry, microbiology, and related fields.
- Engineering: Civil, mechanical, electrical, computer, and chemical engineering programs award a BS (sometimes labeled a BSE or BSME, depending on the school).
- Computer science: Most computer science programs offer a BS track focused on programming, algorithms, and systems design.
- Psychology: Some schools offer psychology as either a BA or a BS. The BS version typically includes more research methods and statistics coursework.
To give a sense of scale, U.S. colleges awarded about 2 million bachelor’s degrees in the 2021-22 academic year. Business alone accounted for roughly 375,400 of those degrees, followed by health professions at 263,800 and engineering at 123,000. Many of those degrees were awarded as a BS.
BS vs. BA: How They Differ
Some subjects, like English or political science, are almost always offered as a BA. Others, like mechanical engineering, are almost always a BS. But a surprising number of fields offer both options, and the distinction comes down to curricular emphasis rather than prestige.
A BA in computer science, for example, might suit someone interested in web design or digital media, with more room for creative electives. A BS in computer science is geared toward students aiming to become software engineers, with deeper coursework in mathematics and systems architecture. Similarly, a BA in economics might focus on policy and theory, while a BS in economics loads up on calculus, econometrics, and data analysis.
The practical difference: a BS signals to employers and graduate programs that you have technical depth in your field. A BA signals broader intellectual range. Neither is inherently better. The right choice depends on what career you’re targeting.
How a BS Affects Your Career Path
In many industries, hiring managers don’t distinguish between a BA and a BS. A bachelor’s degree is a bachelor’s degree. But in technical fields, a BS can matter. Engineering roles, lab positions, and data-heavy business jobs often expect the quantitative foundation that a BS curriculum provides. Some graduate programs in the sciences also prefer applicants with a BS because they’ll have completed prerequisite courses in math and lab sciences that BA holders may lack.
A BS in economics, for instance, can open doors to quantitative finance or data science roles that a BA in economics might not, simply because the coursework includes the statistical and mathematical training those jobs require. Students who double major in a STEM field alongside economics often choose the BS track specifically because employers in those crossover roles expect it.
That said, if your career goals lean toward communication, management, education, or creative fields, a BA can be equally or more valuable. The letters after “Bachelor of” matter less than the skills and knowledge you actually gained.
What It Takes to Earn a BS
Plan on four years of full-time coursework, though some students finish in three years with summer classes or AP credits, and others take five years if they change majors or attend part-time. You’ll complete general education requirements (writing, social science, humanities), your major’s core courses, and whatever electives fit into the remaining credits.
BS programs tend to have more sequential prerequisites than BA programs. A biology major, for example, can’t take advanced genetics without first completing introductory biology and chemistry, which means your course schedule has less wiggle room, especially in the first two years. Many BS programs also include lab components, capstone projects, or internship requirements that add structure to your final semesters.
The total cost and admissions process are the same whether you pursue a BA or BS at a given school. The degree type is a curricular distinction, not a separate admissions track. You typically declare your major (and by extension, whether you’re on the BA or BS path) during your first or second year.