Percent to GPA: why no two tables agree

Type "percentage to GPA" into a search box and you will find a dozen converters, each presenting one table as if it were the law. Here is the uncomfortable truth those pages skip: the mapping from a percent to grade points passes through two school-owned tables — percent to letter, then letter to points — and schools genuinely disagree about both. The same 91 is worth three different GPAs at three real institutions. This guide shows the disagreement with published sources, so you can stop looking for the "right" universal table and start using your school's.

One score, three published readings

United States University's published scale puts the A band at 94–100 and runs its points in thirds: an A− (90–93.99) is 3.67, a B+ is 3.33, a D− is 0.67. North Carolina's State Board of Education has required a statewide 10-point high school scale since 2015–16: A is 90–100 worth 4.0, B is 80–89 worth 3.0, no plus-minus at all. And the common convention this site defaults to reads A at 93 with points in tenths (A− = 3.7).

Now read a 91 on each: this site's default calls it A− = 3.7; USU calls it A− = 3.67; North Carolina calls it A = 4.0. An 88 spreads the same way: B+ = 3.3 here, B+ = 3.33 at USU, B = 3.0 in North Carolina — the NC reading is a third of a point below the USU one, on the same score, from two official published tables. At the bottom of the ladder a 62 is a D− worth 0.7 here, 0.67 at USU, and a D worth a full 1.0 in North Carolina. None of these tables is wrong. They are different policies, each authoritative exactly where it applies.

That is why the calculator prints the comparison in the result itself instead of burying it in fine print: whatever score you enter, you see this table's answer next to USU's and North Carolina's. If the three agree, your score sits safely mid-band. If they split, you have learned that your GPA claim depends on whose table does the reading — which is precisely the thing to know before writing a number on an application.

The reverse direction is a range, not a number

The calculator also runs backward — GPA to percent — and it deliberately refuses to hand back a single percent. A banded table maps every score from 90 to just under 93 onto the same 3.7; reversing that honestly returns the band, not a point inside it. Ask it about 3.7 and you get "A−, 90% to just under 93%." Ask it about a value between rows — a 3.5, say, the average of a B+ term and an A− term — and it names the two straddling rows and declines to interpolate, because no single score produces 3.5 on a banded table; only averages land there. Converters that print "3.5 = 88.75%" are inventing a linearity the table does not have.

What to do in practice

Three situations, three answers. If you are converting your own grades at your own school: find the registrar's table, edit the calculator's minimums and points to match, and the conversion is exact — the tool re-reads the table on every keystroke. If an application asks for a 4.0-scale GPA and your transcript speaks percents: the honest route is percent → your school's letter → the standard ladder, course by course, which is what the GPA calculator does when you feed it letters and credits. If you are comparing across systems — a North Carolina transcript against a 93-band one — resist the urge to convert at all and report each on its own scale with the scale named; that is what admissions offices do themselves, and the recalculation guide shows two published examples of how.

The one thing never to do is average the tables, or pick the friendliest one score by score. A GPA assembled from mixed tables describes no school on earth.

Sources for the two reference tables

United States University publishes its scale in the grading-system section of its policy and procedure manual: A 94–100 = 4.00, A− 90–93.99 = 3.67, B+ 87–89.99 = 3.33, down to D− 60–62.99 = 0.67, F at 59.99 and below. (Its nursing programs run a separate, stricter table; the figures here are the general undergraduate one.) North Carolina's State Board of Education voted in October 2014 to move the state's high schools to a 10-point scale from the 2015–16 school year: A 90–100 = 4.0, B 80–89 = 3.0, C 70–79 = 2.0, D 60–69 = 1.0. The Board's own policy text lives in its grading and transcript standards, which it republishes as a PDF at a URL that changes with each revision, so it is named here rather than linked; the scale itself is reproduced on district pages across the state. Both tables are quoted as published contrasts, not endorsements — your school's table wins.