A 3.8 grade point average is, on the commonest American scale, about roughly two A grades for every A-. That sentence is only true of the scale it is calculated on, and the institutions in this index do not use one scale: the same B+ is worth 3.3 at some, 3.33 at others, 3.3333 at one, and 3.5 at an institution with no minus grades at all. So a 3.8 earned in one place is not the same work as a 3.8 earned in another.
What produces this number
On a plus/minus 4.0 scale a 3.8 is roughly roughly two A grades for every A-, weighted by credit hours rather than by course count. Oregon State states the arithmetic in the clearest published form on this shelf, printing its table as grade points per credit rather than as a bare lookup, which is why a three-credit course moves the average three times as far as a one-credit one. Nothing about that calculation is national: it is your institution's.
The same number on a different scale
South Carolina prints a scale with no minus grades, where a B+ is 3.5 rather than 3.3. Arizona State records an A+ at 4.33 while capping the cumulative average at 4.00. Memphis prints an A- at 3.84 where almost everyone else prints 3.67 or 3.7. A transcript producing 3.8 at one of those institutions would produce a different figure at the others on identical work, which is the single most useful thing to know before comparing your number with anyone else's.
Close to an honours threshold, and why that is not one number
At the top of the scale the published rules stop agreeing. A fixed-threshold institution such as UMBC tells a student exactly what summa cum laude takes. A percentile institution cannot: UMass Amherst awards it to the top five per cent of each school and publishes the realised cut-off afterwards, which for recent graduates has run close to 3.99 in some schools and lower in others.
Questions people ask about 3.8 gpa
Is a 3.8 GPA good?
Good against what is the question the number cannot answer by itself. Against the published honours rules in this index, a fixed-threshold institution such as UMBC puts summa cum laude between 3.95 and 4.0 and UConn puts its floor at 3.7 with a percentile on top, while three institutions here publish no threshold at all. Against your own institution's rules, its registrar page is the only authority.
What letter grades make a 3.8 GPA?
On a plus/minus 4.0 scale, roughly roughly two A grades for every A-. On a scale without minus grades the mix is different, and on a scale recording an A+ above four it is different again.
Does a 3.8 mean the same everywhere?
No. It is a number produced by a scale, and the scales differ. Two institutions in this index price a B+ half a grade point apart, which over a full transcript is worth more than the width of most honours bands.