How to Convert a 100-Point High School Scale to a 4.0 Unweighted GPA

The Percentage Scale Confusion

While most American high schools use the standard A, B, C, D letter grading system, many schools (particularly in states like Texas and New York) use a 100-point percentage scale.

Your transcript might say your cumulative average is a 92.4%. But when you look at college admissions data, every university lists their requirements on a 4.0 scale.

So, how does a 92.4% translate? Is it a 3.8? A 4.0?

The Fatal Flaw of Direct Division

The most common mistake students make is trying to mathematically map the 100-point scale directly onto the 4.0 scale by dividing by 25.

Incorrect Logic:* 92.4 / 25 = 3.69 GPA.

This is entirely wrong. The 4.0 scale is not a linear percentage scale; it is a rigid bracket system.

The Standard Conversion Table

When colleges receive a transcript with a 100-point scale, they do not average the percentages. They convert every individual class grade into a 4.0 scale number first, and then average those numbers.

Here is the most common conversion scale used by the College Board and major universities:

93 - 100: A (4.0 points)

90 - 92: A- (3.7 points)

87 - 89: B+ (3.3 points)

83 - 86: B (3.0 points)

80 - 82: B- (2.7 points)

77 - 79: C+ (2.3 points)

73 - 76: C (2.0 points)

Why Class-by-Class Conversion Matters

Let's say you took two classes. You got a 100% in History and an 86% in Math.

Your percentage average is a 93%.

If you look at the chart, a 93% equals an 'A' (4.0).

But that is not how colleges calculate it. They convert the individual classes first:

100% in History = 4.0

86% in Math = 3.0

Your actual Unweighted GPA is a 3.5.

This is why percentage scales can be so deceiving. A single 86% drags down your 4.0 GPA, even if your overall percentage average remains extremely high. Always convert class-by-class!