Letter Grade to GPA Calculator

What Is the Letter Grade to GPA Calculator?

The Letter Grade to GPA Calculator converts any letter grade — from A+ to F — into its grade point equivalent on the 4.0 scale, the 4.3 scale, and both weighted scales used for AP, IB, and Honors courses. Quick Lookup mode shows all four GPA values for a single grade with one click, with no credit hours or course names required. Multi-Course GPA mode lets you enter an entire semester's grades with course types and returns unweighted and weighted GPA side by side, with a per-course breakdown showing exactly how much each advanced course bonus contributed to the total. According to the College Board's guide to GPA calculation, most students underestimate the impact of AP and Honors course bonuses on their weighted GPA, particularly when those courses contain one or two lower grades that still earn significant weighted credit.

The Standard GPA Conversion Scale

In the United States, the standard unweighted GPA scale assigns a fixed grade point value to each letter grade. These values are uniform across most institutions, though some schools assign A+ the same 4.0 as a plain A while others award 4.3 for A+. The core assignments that apply everywhere are: 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. GPA is then calculated by averaging the grade points across all courses, weighted by credit hours if courses carry different credit loads.

The practical implication of this table is that a C in an AP course (2.0 unweighted) earns 3.0 weighted grade points — identical to a plain B in a regular course. Students who earn Cs in AP classes are not being penalised relative to students earning Bs in easier classes, though the unweighted GPA used by some colleges in recalculation removes the bonus.

Weighted vs Unweighted GPA: What the Difference Actually Means

Unweighted GPA treats every course identically regardless of difficulty. A student taking all regular classes and a student taking four AP classes are both evaluated on the same 4.0 maximum if unweighted GPA is used. Weighted GPA corrects this by adding bonus points for harder courses, typically 0.5 for Honors and 1.0 for AP or IB, raising the effective maximum to 5.0. Most US high schools report weighted GPA on transcripts. The National Association for College Admission Counseling research on admission factors consistently shows that course rigor — the number and difficulty of advanced courses taken — is ranked among the top factors in selective college admissions decisions, meaning that the courses behind the weighted GPA matter as much as the number itself.

For college applications, most selective institutions recalculate GPA on their own scale rather than using the school-reported weighted figure. This recalculation typically strips electives, uses a 4.0 ceiling per course, and focuses on core academic subjects. The result is that two students with very different school-reported weighted GPAs may look similar to an admissions office if their core academic grades are comparable. The National Center for Education Statistics data on GPA and college enrollment shows that students with higher weighted GPAs enroll in four-year colleges at significantly higher rates, reinforcing why understanding the difference between weighted and unweighted figures matters for planning. Knowing both your weighted and unweighted GPA — and understanding how each is calculated — allows you to present your record accurately and to model what additional AP courses would contribute to either figure.

How Plus and Minus Grades Move the Needle

Each plus or minus modifier shifts a grade by 0.3 grade points relative to the plain letter grade. An A− (3.7) is 0.3 below an A (4.0). A B+ (3.3) is 0.3 above a B (3.0). Over a semester of five equal-credit courses, the difference between earning A in all five and earning A− in all five is exactly 5 × 0.3 / 5 = 0.3 GPA points — a 4.0 becomes a 3.7. This is why students near a grade boundary at the end of a term often focus specifically on a single course: moving one A− to an A in a five-course semester raises the semester GPA by 0.06, while doing so in a four-course semester raises it by 0.075. Neither change is dramatic in isolation, but across a cumulative record of 20 to 40 courses, the compounding effect matters.

Why Credit Hours Matter for Multi-Course GPA

In high school, courses typically carry equal weight (one credit per semester-long class), so a simple average of grade points gives the correct GPA. In college, courses carry different credit values: a 4-credit lecture course contributes more to GPA than a 1-credit lab. The correct calculation multiplies each course's grade points by its credit hours, sums all the products, and divides by total credit hours. A student earning an A (4.0) in a 4-credit course and a C (2.0) in a 1-credit course has a GPA of (4.0 × 4 + 2.0 × 1) / 5 = 18 / 5 = 3.6, not the simple average of (4.0 + 2.0) / 2 = 3.0. The credit-weighted calculation is always the more accurate one for college GPA, and our GPA Calculator handles it directly with full credit hour inputs.

Using This Calculator for College Applications

Students preparing college applications often need to report both weighted and unweighted GPA on application forms. Quick Lookup mode lets you check any single grade conversion instantly — useful when filling in a grade report field on an application and needing to verify that a B+ is 3.3, not 3.5. Multi-Course GPA mode lets you model hypothetical scenarios: what would my GPA be if I earned a B instead of a C in AP Physics? Enter the new grade, see both unweighted and weighted figures update immediately, and use the result to set specific study targets. Our Cumulative GPA Calculator extends this to multi-semester tracking, showing how a strong semester can offset a previous lower-performing term in the cumulative record that colleges receive. The most common mistake I see in this process is students reporting their weighted GPA when an application asks for unweighted, or vice versa — using both modes in this calculator gives you both figures accurately and prevents that error.