How to Convert GPA to Percentage (and Back) With the Right Formula

A GPA tells you where you stand relative to your classmates. A percentage tells you where you stand relative to the grading scale. Converting between them is not a single universal formula — it depends on whether your school uses a 4.0 scale, a weighted scale, or a 10-point band system, and getting it wrong can cost you on a scholarship application.

Here is how the conversions actually work, plus the formula that most US universities use when they recalculate an applicant’s transcript. You can check any individual course with our grade calculator, or work a whole transcript in one pass with the average percentage calculator.

The Standard Unweighted 4.0 Conversion Table

Letter Grade	Percentage	Unweighted GPA	Weighted GPA (AP/IB)
A+	97–100%	4.0	5.0
A	93–96%	4.0	5.0
A−	90–92%	3.7	4.7
B+	87–89%	3.3	4.3
B	83–86%	3.0	4.0
B−	80–82%	2.7	3.7
C+	77–79%	2.3	3.3
C	73–76%	2.0	3.0
C−	70–72%	1.7	2.7
D	60–69%	1.0	1.0
F	Below 60%	0.0	0.0

The Two Formulas That Actually Get Used

Method 1 — Band lookup (most common). Convert each course percentage to a letter grade using your school’s band cutoffs, then map the letter to the 4.0 scale. This is what almost every US high school and university registrar does. It is not a linear formula, which is why a 92% (A−, 3.7) and a 96% (A, 4.0) look close in percentage but far apart on GPA.

Method 2 — Linear approximation. Some international credential evaluators use a rough linear rule: GPA = (Percentage ÷ 100) × 4. Under this rule a 85% becomes 3.4. Note that this produces noticeably different results from the band table — that same 85% is a B (3.0) in Method 1. Always ask which method the receiving institution uses.

Going the other direction — GPA back to percentage — most institutions use the midpoint of the corresponding band: 3.7 GPA → ~91%, 3.0 GPA → ~85%, 2.0 GPA → ~75%.

Worked Example: One Semester, Five Courses

A student finishes the fall semester with these grades:

• Calculus — 88% → B+ → 3.3
• English — 94% → A → 4.0
• Chemistry — 79% → C+ → 2.3
• History — 91% → A− → 3.7
• Spanish — 83% → B → 3.0

Unweighted GPA = (3.3 + 4.0 + 2.3 + 3.7 + 3.0) ÷ 5 = 3.26.
The simple average of the percentages is (88 + 94 + 79 + 91 + 83) ÷ 5 = 87.0%.

That pairing — 3.26 GPA against 87.0% — is a useful cross-check. If your school weighted Calculus and Chemistry as honors courses, both would shift up by a full point and the weighted GPA would land near 3.66 instead.

Frequently Asked Questions

Is a 3.5 GPA the same as 90%?
Not exactly. A 3.5 GPA generally maps to roughly 87–89% depending on the scale. A 90% typically corresponds to 3.7 on the unweighted 4.0 scale.

Does the conversion differ between high school and college?
The 4.0 scale is the same, but high schools frequently use weighted scales with a 5.0 ceiling for AP and IB courses, while most colleges cap at 4.0 regardless of course difficulty.

Why do credit hours matter?
A GPA is a weighted average, not a simple one. A 3-credit course counts three times as much as a 1-credit lab. Averaging letter grades without weighting by credits will give you the wrong number.

The Bottom Line

Percentage and GPA measure different things: one is raw performance against a scale, the other is performance relative to a grading band. Move between them course by course, weight by credit hours, and confirm which conversion method the receiving institution uses before you put a number on an application. For quick single conversions, the percentage calculator handles the raw arithmetic.