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Your GPA (grade point average) sums up your grades in a single number on the US 4.0 scale. Because courses carry different credit weights, a heavier class counts more — so GPA isn’t a plain average of letters. Enter each course as “credits, grade” and this calculator does the credit-weighted maths.
How is it calculated?
Letter grades become grade points
Each letter maps to points on the 4.0 scale:
| Grade | Points | Grade | Points |
|---|---|---|---|
| A / A+ | 4.0 | C | 2.0 |
| A− | 3.7 | C− | 1.7 |
| B+ | 3.3 | D+ | 1.3 |
| B | 3.0 | D | 1.0 |
| B− | 2.7 | D− | 0.7 |
| C+ | 2.3 | F | 0.0 |
Credit-weighted average
GPA weights each course by its credit hours:
GPA = Σ(credits × grade points) ÷ Σ credits
So a 4-credit A affects your GPA more than a 1-credit A. Add up the grade points times credits, divide by total credits, and you have your GPA.
Scale notes
This uses the common unweighted US 4.0 scale, capping A/A+ at 4.0. Some schools use a weighted scale (up to 5.0 for honors/AP) or count A+ as 4.3 — check your institution’s policy if yours differs.
Worked example
Three courses: a 3-credit A (4.0), a 4-credit B+ (3.3), and a 3-credit A− (3.7). Grade points are 3×4.0 = 12.0, 4×3.3 = 13.2, and 3×3.7 = 11.1, totalling 36.3 over 10 credits. GPA = 36.3 ÷ 10 = 3.63. Note the 4-credit B+ pulls the average down more than a 1-credit B+ would.
FAQ
How is GPA calculated?+
Multiply each course’s grade points by its credit hours, add those up, and divide by the total credits: GPA = Σ(credits × points) ÷ Σ credits. It’s a credit-weighted average, so bigger courses count more.
What are the grade point values?+
On the standard 4.0 scale: 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+ = 1.3, D = 1.0, D− = 0.7, and F = 0.0. This calculator uses these values.
Why weight by credits?+
Because courses aren’t equal in size. A 4-credit course represents more work than a 1-credit one, so it should influence your GPA more. Weighting by credit hours reflects that, unlike a plain average of letter grades.
Does it handle a weighted (5.0) scale?+
This tool uses the unweighted 4.0 scale, where A caps at 4.0. Weighted scales add points for honors or AP classes (often up to 5.0) and vary by school, so if yours is weighted, adjust the grades or check your institution’s policy.
Is A+ worth more than A?+
On most US 4.0 scales, no — both A and A+ count as 4.0, which is what this calculator uses. Some schools give A+ a 4.3, but that isn’t standard, so check your institution if it matters to you.