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Nigeria Grade Conversion to US GPA

Convert Nigerian university CGPA (5.0 scale) and degree classifications — First Class, Second Class Upper, Second Class Lower — to the US 4.0 GPA scale.

Scale: 5.0 CGPA with British-style degree classifications  |  Range: 0.0–5.0
US GPA Equivalent
4.00
Excellent
US Letter Grade
Nigeria Grade
First Class (4.50–5.00)
Score Range
4.5–5
Classification
First Class Honours

How Nigeria's Grading System Works

Nigerian universities use a 5.0 CGPA (Cumulative Grade Point Average) scale, which is distinct from both the US 4.0 scale and many other countries' systems. The National Universities Commission (NUC) regulates this system across all accredited Nigerian universities, including the University of Lagos, Obafemi Awolowo University, University of Ibadan, and others.

The Nigerian system classifies degrees into five honors classes: First Class (4.50–5.00), Second Class Upper (3.50–4.49), Second Class Lower (2.40–3.49), Third Class (1.50–2.39), and Pass (1.00–1.49). A CGPA below 1.0 results in a fail or academic dismissal. These class designations follow the British tradition inherited during colonialism.

First Class honors is highly prestigious in Nigeria, and only a small percentage of students achieve it. Universities such as Covenant University and private institutions have been known to produce higher First Class rates. Second Class Upper (commonly called "2:1") is the benchmark for most competitive graduate programs and corporate jobs.

When converting to the US GPA system, Nigerian First Class (5.0) maps to a 4.0 US GPA. Second Class Upper (3.5–4.49) corresponds to roughly 3.5 US GPA, making Nigerian Second Class Upper graduates competitive for US master's programs.

Conversion Formula

Nigerian 5.0 CGPA → US 4.0 GPA:
First Class (4.50–5.00) → 4.0 GPA
Second Class Upper (3.50–4.49) → 3.5 GPA
Second Class Lower (2.40–3.49) → 2.7 GPA
Third Class (1.50–2.39) → 2.0 GPA
Pass (1.00–1.49) → 1.0 GPA
Fail (<1.00) → 0.0 GPA

US GPA ≈ Nigerian CGPA × (4.0 / 5.0) for rough conversion

Worked Example

Student: Chukwuemeka, B.Sc. Computer Science, University of Lagos

Chukwuemeka graduates with a CGPA of 4.12/5.0 — a Second Class Upper.

4.12 / 5.0 × 4.0 = 3.30 US GPA (approximate). Using the class-based table: Second Class Upper → 3.5 GPA.

His degree is competitive for US graduate admissions in computer science at mid-tier universities.

Frequently Asked Questions

The simplest method is to divide your Nigerian CGPA by 5.0 and multiply by 4.0. For example, a 3.8/5.0 CGPA becomes (3.8/5.0) × 4.0 = 3.04 US GPA. However, class-based conversion tables (as shown above) are more widely accepted by US institutions since they reflect academic standing rather than a simple ratio.
Yes, a Second Class Upper (2:1) from a recognized Nigerian university is generally competitive for US master's programs. It converts to approximately 3.3–3.5 on the US scale. Top-ranked US programs may prefer First Class or Second Class Upper combined with strong GRE scores and research experience.
First Class honors requires a CGPA of 4.50–5.00 on Nigeria's 5-point scale. It is the equivalent of a 4.0 US GPA and represents the highest academic achievement. First Class graduates are highly sought after by employers and graduate programs, but only about 1–5% of students achieve this at most Nigerian universities.
Yes, WES (World Education Services) and other NACES-member organizations evaluate Nigerian degrees for US admission purposes. They typically request official transcripts from your university and will produce an equivalency report. For Nigerian universities, WES is one of the most commonly requested evaluators. Processing typically takes 7–20 business days.
Third Class (1.50–2.39 CGPA) corresponds to approximately a 2.0 US GPA. While this limits options for competitive US graduate programs, some universities accept students with lower GPAs if accompanied by strong professional experience, recommendations, or a strong personal statement. Community colleges and some state universities may also admit international students with Third Class degrees for undergraduate-level coursework.

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