How do you calculate GPA from letter grades?
Convert each letter to points (A=4.0, B=3.0, C=2.0, D=1.0, F=0), multiply by the course's credit hours, add the results, and divide by total credits. An A in a 3-credit course and a B in a 4-credit course give (12 + 12) ÷ 7 = 3.43.
Worked example: 4-course semester
| Course | Grade → points | Quality points |
|---|---|---|
| English (3 credits) | A = 4.0 | 3 × 4.0 = 12.0 |
| Biology (4 credits) | B = 3.0 | 4 × 3.0 = 12.0 |
| History (3 credits) | A− = 3.7 | 3 × 3.7 = 11.1 |
| Math (4 credits) | B+ = 3.3 | 4 × 3.3 = 13.2 |
| Semester GPA | 3.46 | 48.3 ÷ 14 credits |
How to read this table
- English (3 credits) sits at the top of the table (A = 4.0) — 3 × 4.0 = 12.0. If your situation looks like this row, plan against the upper half of the range rather than the midpoint.
- Biology (4 credits) anchors the bottom (B = 3.0) — 4 × 3.0 = 12.0. Treat this as the conservative case you should still be profitable at.
- With 5 reference points in the "worked example: 4-course semester" table, the fastest way to use this page is to find the closest row, take its grade → points, then stress-test it ±30% before you build a plan on it.
Context
Plus/minus grading changes the result materially: most schools use A− = 3.7, B+ = 3.3, B− = 2.7, so the difference between B+ and A− across a semester is about 0.2 GPA points. Weighted high-school GPA adds 0.5–1.0 for honors/AP courses, which is how valedictorians exceed 4.0. Check whether your school caps weighted GPA or reports both weighted and unweighted.
What moves this number
Syllabus weighting scheme
The same scores produce different grades under category weights, points-based grading, and drop-lowest policies. The syllabus — not the raw scores — determines which formula applies.
Plus/minus and cutoff policy
Schools set their own letter-grade cutoffs (90 vs 93 for an A) and whether plus/minus exists. A 2-point cutoff difference moves a borderline grade by a full letter.
Credit-hour weighting
GPA is credit-weighted, so a 4-credit course moves the average twice as much as a 2-credit course with the same grade.
Methodology
Standard US 4.0 scale with the common plus/minus values (A=4.0, A−=3.7, B+=3.3, B=3.0, B−=2.7, C+=2.3, C=2.0, C−=1.7, D=1.0, F=0). Quality points = grade points × credit hours; GPA = Σ quality points ÷ Σ credits.
Assumptions and caveats
- Grading policies (weights, drops, curves, cutoffs) are set by each school — verify against the syllabus before acting on a computed grade.
- Letter-grade and GPA scales shown are the common US conventions, not a universal standard.
- This page was last reviewed on 2026-10-01. Ranges are updated as new data lands, so re-check before using them in a contract or a plan.
- Use these numbers as a starting range, not a guarantee — your own historical data always beats a benchmark.
Frequently asked questions
How do you calculate GPA from letter grades?
Convert each letter to points (A=4.0, B=3.0, C=2.0, D=1.0, F=0), multiply by the course's credit hours, add the results, and divide by total credits. An A in a 3-credit course and a B in a 4-credit course give (12 + 12) ÷ 7 = 3.43.
Which option pays the most in the worked example: 4-course semester table?
English (3 credits), at A = 4.0 (3 × 4.0 = 12.0). That row represents the strongest case in this dataset, so use it as an upper bound rather than an expectation.
What is a realistic low-end figure?
Biology (4 credits) at B = 3.0 (4 × 3.0 = 12.0). Plan your costs so the low end still works, then treat anything above it as upside.
Where do these numbers come from?
Standard US 4.0 scale with the common plus/minus values (A=4.0, A−=3.7, B+=3.3, B=3.0, B−=2.7, C+=2.3, C=2.0, C−=1.7, D=1.0, F=0). Quality points = grade points × credit hours; GPA = Σ quality points ÷ Σ credits.
How can I estimate my own number instead of using a benchmark?
Use the Cumulative GPA Calculator on RevenueLab — it takes your own inputs and returns a figure specific to your setup, which is always more accurate than a published range.
Model your own numbers
Related reading
More answers in this category
- How do you calculate a weighted grade when you have missing assignments?
- How do you calculate a weighted grade?
- How do you calculate what grade you need on the final exam?
- How do you calculate your grade from percentages?
Looking for a calculator?
Search every free tool on RevenueLab — or describe your problem and Rex will pick one.
Last updated 2026-10-01.