How to Calculate Your GPA on the 4.0 Scale (and Get a Number That Matches Your Transcript)
By the Super Simple Digital Tools Team · Updated June 2026
Most students assume GPA is just the average of their letter grades, but that shortcut quietly produces the wrong number. GPA is a credit-weighted average, which means a course's credit hours decide how much each grade counts. Before you calculate anything, gather two pieces of information for every class: the letter grade and how many credit hours it carried. With those in hand, the math becomes mechanical and repeatable, and it will line up with what your registrar reports.
Start by converting each letter grade to its point value on the 4.0 scale. The common mapping is 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, and F=0.0. Pluses generally add 0.3 and minuses subtract 0.3, though plenty of schools skip plus/minus grades entirely and a few treat A+ as 4.3. If your school does something different, use its table instead, because the conversion step is where most calculation errors creep in.
Next, turn each grade into quality points by multiplying its point value by the course's credit hours. An A (4.0) in a 4-credit course is 16 quality points; a B+ (3.3) in a 3-credit course is 9.9. Add up every course's quality points, then add up every course's credit hours separately. Your GPA is the total quality points divided by the total credit hours. A worked semester of A/4cr, B+/3cr, A-/4cr, and B/3cr gives 49.7 quality points over 14 credits, or a 3.55 GPA.
To extend this into a cumulative GPA, resist the urge to average your semester GPAs together. That only works when every term has identical credits, which almost never happens. Instead, keep two running totals across all terms: total quality points and total credit hours, and divide one by the other. A term with 18 credits moves your cumulative average far more than a light 9-credit term, exactly as it should, and this method captures that automatically.
Finally, decide whether you need a weighted or unweighted figure and use the right one for the right purpose. Weighted GPA rewards honors and AP/IB rigor with bonus points and is useful for class rank and scholarship cutoffs that expect it. Unweighted GPA strips that bonus and is what many colleges recalculate to so they can compare applicants on equal footing. Knowing which number a form is asking for prevents you from reporting a 4.3 where a 3.9 was expected, or the reverse.
- Always weight by credit hours, never average letter grades directly; a 4-credit course counts roughly a third more than a 3-credit one.
- For cumulative GPA, sum total quality points and total credits across all terms and divide once, rather than averaging per-semester GPAs.
- Confirm your school's exact scale before trusting a result, since some omit plus/minus grades and some count A+ as 4.3 instead of 4.0.
- Keep separate weighted and unweighted figures on hand so you can report whichever a scholarship or application specifically requests.