STEM Degree ROI Comparison: Which STEM Major Pays Best?

Salary Overview

STEM degree costs and outcomes vary dramatically across disciplines. A computer science degree costs roughly the same as an engineering degree ($40,000–$120,000) but delivers entry-level salaries 15–25% higher. Biology and chemistry degrees cost the same but lead to lower entry-level pay, making the ROI timeline longer unless the graduate pursues graduate credentials.

The highest-ROI path depends on your risk tolerance and timeline. Computer Science and Engineering offer the fastest payback (2–4 years) and clearest high-pay ceiling. Physics and Math PhDs require longer educational investment but reach comparable top-end earnings. Biology careers often require advanced degrees (MD, PhD, DVM) to reach premium salaries.

Salary by Role and Experience

RoleMedian SalaryTop 10% SalaryComputer Science (BS)$120,000–$150,000$200,000+ with experienceChemical Engineering (BS)$75,000–$95,000$130,000+ with PEPetroleum Engineering (BS)$95,000–$120,000$160,000+ with experienceBiology (BS)$50,000–$65,000$85,000+ with MS/PhD/MDMathematics (BS)$70,000–$90,000$130,000+ with PhDPhysics (BS)$65,000–$85,000$140,000+ with PhD/specialization

Return on Investment Analysis

Computer Science degrees deliver the fastest ROI: $40,000–$120,000 tuition cost with $120,000–$150,000 entry-level salaries means payback within 1–2 years. Engineering (excluding petroleum) delivers slower but still strong ROI: $2–3 year payback with $75,000–$95,000 entry salaries.

Biology majors face the longest ROI timeline for a BS alone: $50,000–$65,000 entry salary requires 5–8 years to recoup a $120,000 degree cost. However, biology graduates who pursue MD, DVM, or PhD credentials reach $150,000–$300,000+ earnings, making the long-term ROI exceptional if professional school is planned.

Factors That Affect Earnings

• Entry-level salary is the primary differentiator across STEM majors
• Graduate degree requirements — Computer Science can reach $200,000+ with BS alone; Biology typically requires MS/PhD/MD
• Job market demand — Computer Science, Engineering, and specialized roles (Actuarial) have stronger demand than general Biology
• Specialization path — Physics PhD ($140,000+) vs Physics BS ($65,000) has a massive variance based on graduate school pursuit
• Geographic market — Tech hubs pay 20–40% premiums for CS, while engineering pays regionally based on industry concentration

Career Growth Timeline

1. Year 1–2 entry: CS ($120K+), Engineering ($75K–$95K), Biology ($50K–$65K), Math ($70K–$90K)
2. Year 3–5 growth: CS ($150K–$180K), Engineering ($95K–$130K), Biology with MS ($75K–$95K), Math MS/PhD start ($85K+)
3. Year 5–10 advancement: CS ($180K–$250K+), Engineering senior ($130K–$160K), Biology with advanced degree ($100K–$150K)
4. Year 10+ peak: CS principal engineer ($250K+), Engineering principal ($160K–$200K+), Biology MD/PhD ($150K–$300K+)

Geographic and Industry Variation

Computer Science salary premiums cluster in tech hubs: San Francisco Bay Area ($180,000–$220,000 median), Seattle ($160,000–$180,000), Boston ($150,000–$170,000), and New York ($140,000–$160,000). Engineering salaries are more distributed, with petroleum/chemical concentrated in Texas and Gulf states.

Cost-of-living adjusted, Midwest and Southeast states often offer better purchasing power for STEM graduates. A $150,000 CS salary in San Francisco yields less disposable income than a $120,000 engineering salary in Texas or a $110,000 salary in Minnesota.

Related Reading

• engineering-salary-guide
• mathematics-actuary-salary-guide
• biomedical-scientist-salary-guide

Key Takeaways

• Computer Science delivers fastest ROI: $120K+ entry, payback in 1–2 years
• Engineering ranges from $91K (civil) to $135K (petroleum) median
• Biology BS is lowest entry ($50K–$65K) unless MS/MD/PhD is planned

Sources

• BLS May 2024 OES
• NSF salary surveys
• Levels.fyi