GPA to 4.0 scale converter

How do I convert a 100-point GPA to the 4.0 scale?

Find the letter grade your average earns on your school’s scale, then use that letter’s points on the 4.0 scale. An A is 4.0, a B is 3.0, a C is 2.0 and a D is 1.0. With plus and minus grades, an A− is 3.7, a B+ 3.3, a B− 2.7 and so on down.

The College Board’s GPA guide uses whole letters: A for 90 to 100, B for 80 to 89, C for 70 to 79, D for 66 to 69, and E or F below 65. Its chart leaves 65 itself out, so if your school uses that chart, set the D cutoff in the converter to 65 or 66 to match. The College Board also says its ranges “reflect one commonly used system, but your school may calculate GPA differently.”

One limit matters more than the cutoffs. A 100-point GPA is an average of course grades, and converting the average gives a different answer from converting each course. Two courses at 100 and 86 average 93, an A worth 4.0. Converted one at a time they are an A (4.0) and a B (3.0), and the 4.0-scale GPA is 3.5. If you have your course grades, convert each one with the percentage to GPA calculator and average them in the GPA calculator.

100-point GPA to 4.0 scale chart

Each row is one whole-number GPA. “Letters only” uses A 90, B 80, C 70. “Plus and minus” uses the common syllabus ladder (A 93, A− 90, B+ 87, B 83, B− 80, C+ 77, C 73, C− 70). The straight proportion column is shown only to compare.

Below 70, the letters-only scale gives a D (1.0) from 60 to 69 and an F (0.0) under 60, and the plus and minus ladder gives a D+ (1.3) from 67, a D (1.0) from 63 and a D− (0.7) from 60. If your school uses College Board’s chart, a D starts at 66 instead.

How do I convert a weighted GPA to unweighted?

A weighted GPA adds extra points for harder courses. On a 5.0 scale, honors courses commonly add 0.5 and AP, IB or dual-credit courses add 1.0, so an A in an AP course counts as 5.0. On a 6.0 scale, the top courses can add up to 2 points. To take the weighting out, subtract the average extra points per course:

4.0-scale GPA = weighted GPA − (sum of extra points × courses that got them) ÷ all courses

Example: 12 courses, 2 of them honors (+0.5) and 3 of them AP (+1). The extra points add up to 2 × 0.5 + 3 × 1 = 4, which is 4 ÷ 12 = 0.333 per course. A 4.2 weighted GPA is 4.2 − 0.333 = 3.87 unweighted.

This assumes each course counts the same. If one course carries double credit, count it twice. If you don’t know how many courses were weighted, the converter gives a range instead: no higher than 4.0 (or your GPA, if lower), and no lower than your GPA minus the largest extra.

The table shows how much the share of weighted courses matters, for courses that each added 1 point. “Not possible” means a 4.0-scale GPA would come out above 4.0, so more of the courses must have been weighted.

How do I convert a 4.3 GPA to the 4.0 scale?

On a 4.3 scale only the A+ is different: it is worth 4.3 instead of 4.0, and every other letter keeps its points. So subtract 0.3 for each A+, divided by all your courses. With 3 A+ grades in 20 courses, a 3.95 on the 4.3 scale is 3.95 − (3 × 0.3) ÷ 20 = 3.905, or 3.91 on the 4.0 scale. A 4.33 scale works the same way with 0.33 per A+.

Without the count, the 4.0 value is somewhere between your GPA minus 0.3 and your GPA capped at 4.0.

Can I convert a 10-point CGPA to a 4.0 GPA?

Only roughly. There is no single official formula from a 10-point scale to the US 4.0 scale. The converter shows the straight proportion, CGPA × 4 ÷ 10, so an 8.2 becomes 3.28. That is arithmetic, not an evaluation. If a US college or a credential evaluator asks for a GPA on the 4.0 scale, use the conversion it names, or send what it asks for and let it convert.

Why dividing by the top of the scale gets it wrong

Dividing assumes your grades are spread evenly up to the scale’s maximum. They aren’t. On a weighted scale, a regular course can never earn more than 4.0, so the top of the scale is out of reach for most of your courses. In the example above, the straight proportion turns a 4.2 weighted GPA into 4.2 × 4 ÷ 5 = 3.36, while removing the actual extra points gives 3.87. On the 100-point scale, a 93 divided down is 3.72, though a 93 is an A on both scales in the chart above.

What GPA is a B average?

On the 4.0 scale a B average is a 3.0. A B+ is 3.3 and an A− is 3.7. A C average is 2.0 and a D average is 1.0. An A or A+ is 4.0, unless your school uses a 4.3 scale, where an A+ is 4.3.

Do colleges use my converted GPA?

Many recalculate it themselves. The College Board says colleges “may recalculate your GPA based on their own criteria.” Some remove noncore courses such as physical education or electives, some focus on core subjects, some “adjust or remove weighting assigned to AP or honors,” and some apply their own weighting. It adds that many colleges ask you to report your actual grades, on the Common App or a self-reported academic record, so they can recalculate with their own method. A converted GPA is still useful for comparing yourself with a college’s published ranges.

Related tools: the high school GPA calculator works out weighted and unweighted GPAs side by side from your courses, and the raise GPA calculator shows what you need next term.

GPA scale converter FAQ

Sources

• College Board BigFuture, How to Calculate Your GPA on a 4.0 Scale. The whole-letter chart and how colleges recalculate GPA. Checked October 2026.
• Plus and minus grade points (A− 3.7, B+ 3.3, A+ 4.3 on a 4.3 scale) and the common honors (+0.5) and AP (+1.0) weighting are the scales used across this site’s percentage to GPA calculator. Your school’s own scale overrides them.