The Complete GPA Guide

Updated July 17, 2026 · 11 min read

Grade Point Average — GPA — is the single number that college admissions officers, scholarship committees, and graduate schools use to summarize years of coursework. It's more important than any individual grade, and yet most students never learn how it's actually calculated. This guide fixes that.

What GPA is

A GPA is a weighted average of the letter grades you've earned, converted to a number and weighted by the credit hours (or course units) of each class. On the standard US 4.0 scale:

A = 4.0
B = 3.0
C = 2.0
D = 1.0
F = 0.0

Schools that use plus/minus letter grades typically use this finer scale:

A+ = 4.0 (or 4.3 at some colleges), 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

The GPA formula

GPA = Σ (Grade points × Credit hours) ÷ Σ (Credit hours)

Multiply each course's grade points by its credit hours, add those products, then divide by the total credit hours.

Worked example (one semester)

Assume five classes:

English (3 credits): A → 4.0 × 3 = 12.0
Biology (4 credits): B+ → 3.3 × 4 = 13.2
Algebra II (3 credits): B → 3.0 × 3 = 9.0
US History (3 credits): A− → 3.7 × 3 = 11.1
PE (1 credit): A → 4.0 × 1 = 4.0

Total quality points = 49.3. Total credits = 14. GPA = 49.3 ÷ 14 = 3.52.

Our GPA calculator handles the arithmetic for as many courses as you want.

Unweighted vs weighted GPA

Unweighted GPA caps every A at 4.0, whether the class was AP Physics or study hall. Weighted GPA gives extra points for harder classes — usually +1.0 for AP/IB and +0.5 for honors. A student with all A's in five AP classes could have a 5.0 weighted GPA on a 4.0 unweighted scale.

Most high school transcripts show both. Colleges recalculate GPA their own way anyway, so don't obsess — but understand which number your school is reporting.

Cumulative GPA vs semester GPA

A semester GPA is just for the current term. A cumulative GPA combines every semester you've completed. To calculate cumulative GPA:

Cumulative GPA = Σ all quality points earned ever ÷ Σ all credits attempted

It is not the average of your semester GPAs — that math only works if every semester has identical credit hours. Always go back to total quality points and total credits.

How much can one bad grade hurt your GPA?

The higher your cumulative GPA and the more credits you've completed, the smaller the impact of any one grade. A single C+ (2.3) in a 3-credit class drops a 3.8 cumulative GPA by roughly 0.05 after one semester of freshman year — but by only 0.01 after three years of college. The math is unforgiving early and forgiving late.

How to raise a GPA

Retake if your school allows grade replacement. Some high schools and most colleges will replace the original grade in the GPA calculation (though the original stays on the transcript).
Load up on credits when you're doing well. An A in a 4-credit class helps more than an A in a 1-credit class.
Attack the low grades first. Moving a D to a B raises GPA more than moving a B to an A, because the range is bigger.
Don't drop below full-time strategically. Withdrawn (W) grades don't hurt GPA, but too many raise flags with admissions and financial aid.

What's a "good" GPA?

It depends on where you're headed. Nationally, roughly:

3.0 unweighted — meets most public university thresholds
3.5+ unweighted — competitive for selective universities
3.8+ unweighted or 4.5+ weighted — competitive for elite admissions
3.0+ college — safe for most graduate programs
3.5+ college — competitive for professional schools (law, med)

These are ballpark numbers. Individual programs vary dramatically; check the schools you actually care about.

Frequently asked questions

Is a 4.0 the highest GPA possible?

On an unweighted 4.0 scale, yes. On a weighted scale, GPAs above 4.0 are common — 4.5, 5.0, and occasionally higher.

Does pass/fail count toward GPA?

Usually no. Pass/fail courses appear on the transcript but don't contribute quality points or credits to the GPA calculation.

Do middle school grades count?

For high school GPA and college admissions, no. Only courses taken for high school credit (occasionally including 8th grade Algebra I or a foreign language) show up.

Ready to compute yours? Open the GPA calculator and enter one class at a time.