High School GPA Scale Explained — The Complete 2026 Guide

The High School GPA Scale — Everything Explained

There isn't just one GPA scale. High schools in the United States use several different systems, and understanding which one your school uses is essential for accurately calculating and reporting your GPA.

1. The Unweighted 4.0 Scale (Most Common)

The standard unweighted GPA scale runs from 0.0 to 4.0. It's used by most US high schools and virtually all colleges.

| Letter Grade | GPA Points | |---|---| | A+ | 4.0 | | 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 | | F | 0.0 |

Key characteristic: Every class is worth the same — AP Calculus and Regular Art both give you 4.0 for an A. The scale maxes out at 4.0.

2. The Weighted 5.0 Scale (For AP/IB/Honors)

The weighted GPA scale is the same as the unweighted scale, but adds bonus points for harder courses:

AP / IB courses: +1.0 bonus (so an A in AP = 5.0)

Honors courses: +0.5 bonus (so an A in Honors = 4.5)

Regular courses: No bonus (same as unweighted)

The maximum weighted GPA is 5.0. This scale exists to reward students for taking more challenging courses.

Important: The weighted 5.0 scale is a high school only concept. College GPA is always calculated on the standard 4.0 unweighted scale.

3. The 100-Point (Percentage) Scale

Some school districts, particularly in Texas and parts of the South, report GPA on a 100-point scale (like a cumulative percentage).

90–100: A

80–89: B

70–79: C

60–69: D

Below 60: F

A "95 average" on this scale is roughly equivalent to a 4.0 GPA. Converting between scales:

100-point to 4.0: (Percentage - 50) × 0.08 (rough approximation)

4. The Plus/Minus vs. No Plus/Minus Distinction

Some high schools use letter grades with plus/minus (A, A−, B+, B, B−, etc.). Others only use straight letter grades (A, B, C, D, F).

Why this matters: A school that only uses straight letter grades with no plus/minus has no way to distinguish between a student who got 93% in every class vs. one who got 99%. Both show as 4.0.

When you're calculating your GPA, it's important to know which system your school uses. Our High School GPA Calculator supports both.

5. How Different School Districts Weight AP/Honors

Not all weighted GPA systems are the same. The specific bonus points vary by district:

Standard Weighting (most common):

AP/IB: +1.0 | Honors: +0.5

Some Texas school districts:

AP: +10 points on the 100-point scale

LAUSD (Los Angeles):

AP: +1.0 | Honors: +1.0

Miami-Dade County:

A in AP = 5.0 × weight | A in Honors = 4.5 × weight (different math)

This is why our High School GPA Calculator has district-specific options — the bonus points are genuinely different across districts and using the wrong system gives you an inaccurate GPA.

How Colleges Interpret Your GPA Scale

When you apply to college, admissions officers know your school's scale. A 4.5 weighted GPA at a school that aggressively weights AP courses (like LAUSD with +1.0 for Honors) isn't equivalent to a 4.5 at a school with standard +0.5 Honors weighting.

This is why most selective colleges recalculate your GPA on their own standardized 4.0 scale before comparing applicants. They strip out the weighting and evaluate the raw unweighted number combined with your course list.

What GPA Scale Should You Report?

College applications: Report both weighted and unweighted GPA, clearly labeled. Most applications (Common App, etc.) ask for both.

Scholarships: Usually ask for unweighted GPA on the 4.0 scale.

Job applications: Report your GPA on whichever scale you were officially graded on. If your transcript says 3.7, report 3.7.

Calculate Your GPA on Any Scale

Use our free tools to calculate your exact GPA: - High School GPA Calculator — Weighted + unweighted, with district options - Weighted GPA Calculator — AP/IB/Honors bonus calculator - Unweighted GPA Calculator — Standard 4.0 scale only