How GPA Is Calculated: The Weighted Average Behind Your Average

The Core Formula

GPA is a weighted average. Each course's grade points are multiplied by its credit hours, those products are summed, and the total is divided by the total credit hours:

GPA = Σ(Grade Points × Credits) ÷ Σ Credits

The 4.0 Scale

On the standard U.S. 4.0 scale, an A is 4.0, B is 3.0, C is 2.0, D is 1.0, and F is 0.0. Pluses and minuses shift the value: an A− is 3.7, B+ is 3.3, and so on.

Full 4.0 Scale Reference

• A+ / 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 | D− = 0.7
• F = 0.0

Why Credits Matter More Than Grades

A 4-credit course counts more than a 1-credit course. That's why an A in a heavy course helps your GPA more than an A in a light one — and why a bad grade in a big course hurts more. A B in a 4-credit physics class impacts your GPA more than an A in a 1-credit lab.

• A 3-credit A (4.0) contributes 12.0 grade points
• A 4-credit B+ (3.3) contributes 13.2 grade points
• Total = 25.2 ÷ 7 credits = 3.60 GPA

Weighted vs. Unweighted GPA

Some high schools use a weighted GPA that adds extra points for honors, AP, or IB courses — sometimes pushing the scale above 4.0. A weighted A in an AP class might be 5.0, meaning a student with all honors/AP courses could have a GPA above 4.0. Colleges often recalculate GPAs on their own unweighted scale, so both numbers matter.

Typical Weighted Scale

• Regular course A = 4.0
• Honors course A = 4.5
• AP/IB course A = 5.0
• This means a B in an AP course (4.0 weighted) can look the same as an A in a regular course
• Colleges see both — the course rigor in your transcript, and the recalculated GPA

Cumulative GPA: It's a Running Average

Your cumulative GPA includes every course you've taken, weighted by credits. Early grades matter, but because each term adds more credits, the impact of any single course shrinks over time. A freshman with 30 credits can move their GPA significantly with one strong semester; a junior with 90 credits will find it much harder to budge.

How to Raise Your GPA

The math is straightforward but unforgiving: you need more grade points to raise a lower GPA. Going from 2.5 to 3.0 across 60 existing credits requires earning roughly 3.5+ in your next 30 credits. The gap narrows as you accumulate more credits. Focus on high-credit courses first — an A in a 4-credit course helps twice as much as an A in a 2-credit course.

Major GPA vs. Cumulative GPA

Many employers and graduate programs look at your major GPA — just courses in your field — separately from your overall cumulative GPA. A student with a 3.8 major GPA in computer science and a 3.2 cumulative GPA (dragged down by general education courses) may still be very competitive for tech jobs.