Lambert High School GPA Calculator

This page provides a GPA calculator tailored for Lambert High School students, letting you compute your grade point average by entering your course grades and credit hours. You get both your unweighted and weighted GPA based on the standard 4.0 and 5.0 scales used at Lambert. The calculator also shows how your GPA is affected by honors, AP, and dual enrollment courses.

Formula

For each course, convert the numerical grade to a 4.0 scale using the standard Lambert conversion: A (90-100) = 4.0, B (80-89) = 3.0, C (70-79) = 2.0, D (60-69) = 1.0, F (below 60) = 0.0. Then add the weight for each course type: 0 for regular, 0.5 for honors, and 1.0 for AP/IB. The unweighted GPA is the average of the 4.0 values. The weighted GPA is the average of the (4.0 + weight) values.

In symbols: UW GPA = (g1 + g2 + … + gn) / n, where gi is the 4.0 equivalent of course i. W GPA = (g1 + w1 + g2 + w2 + … + gn + wn) / n, where wi is the weight for course i.

Worked Example

Using the default grades: 92, 85, 78, 88, 95, 90. First convert each to the 4.0 scale:

• 92 → 4.0
• 85 → 3.0
• 78 → 2.0
• 88 → 3.0
• 95 → 4.0
• 90 → 4.0

Sum = 4.0 + 3.0 + 2.0 + 3.0 + 4.0 + 4.0 = 20.0. Divide by 6 = 3.33 unweighted GPA.

Now add weights. Assume the first three courses are AP (weight 1.0 each) and the last three are regular (weight 0). Weighted values: 4.0+1=5.0, 3.0+1=4.0, 2.0+1=3.0, 3.0+0=3.0, 4.0+0=4.0, 4.0+0=4.0. Sum = 23.0. Divide by 6 = 3.83 weighted GPA.

The calculator gives the same results: 3.33 and 3.83.

How Lambert Calculates GPA

Lambert High School, part of Forsyth County Schools in Georgia, uses a standard 4.0 scale for unweighted GPA. Weighted GPA adds 0.5 for honors courses and 1.0 for AP or IB courses. Dual enrollment courses typically receive the same weight as AP. The GPA is calculated on a 4.0 scale, meaning the highest possible weighted GPA is 5.0 if all courses are AP/IB. This is different from some schools that use a 6.0 or 100-point scale.

When you apply to college, colleges often recalculate your GPA using their own formula. Some colleges only look at core academic courses, while others include electives. Your transcript will show both the weighted and unweighted GPA, but colleges may use their own calculation.

How to Use the Calculator

Enter your grades for each course (0-100). For each course, select the type: Regular, Honors, or AP/IB. The calculator automatically converts the grade to the 4.0 scale and adds the weight. The result shows both your unweighted and weighted GPA for the six courses you entered.

If you have more than six courses, you can calculate in batches and average the results manually, or adjust the calculator by entering additional courses (not available here). For a full semester, you typically have 6-7 courses, so this covers most schedules.

To find your cumulative GPA, you would need to factor in all previous courses with their credit hours. This calculator assumes each course carries equal credit (1.0). If you have a course that is half-credit, you would need to weight it accordingly.

Common Mistakes

One common mistake is using letter grades instead of numerical grades. Lambert uses numerical grades on report cards, so use the number. Another mistake is forgetting to select the course type for each course, which would give you an unweighted GPA only.

Also, be careful with the grade conversion. Some schools use a plus/minus system where an A- is 3.7, but Lambert uses a straight scale: 90-100 is an A (4.0), 80-89 is a B (3.0), etc. There is no 3.5 for a B+. This calculator follows the straight scale.

Rounding can also cause confusion. The calculator rounds to two decimal places, which is typical for GPA reporting. But some colleges may round differently, so your official GPA might differ slightly.

Weighted vs. Unweighted GPA

Your unweighted GPA is the simple average of your grades on the 4.0 scale, regardless of course difficulty. Your weighted GPA adds bonus points for challenging courses. A student with all A’s in regular courses has a 4.0 unweighted and 4.0 weighted. A student with all A’s in AP courses has a 4.0 unweighted but a 5.0 weighted.

Colleges often look at both. The weighted GPA shows course rigor, while the unweighted GPA shows your raw performance. For class rank, Lambert uses the weighted GPA, which is why students are encouraged to take AP courses.

It’s important to note that a high weighted GPA does not compensate for a low unweighted GPA. Colleges evaluate your transcript holistically.

Limitations of the Calculator

This calculator assumes all courses are full-year and equal credit. If you have semester-long courses, you may need to adjust. Also, it does not account for pass/fail courses, which do not affect GPA. It only works for numerical grades; if you have letter grades, convert them first to numbers (A=95, B=85, etc.).

The calculator uses the standard Lambert conversion, but always verify with your counselor for the most accurate calculation, especially if you have transfer credits or unusual courses.

Frequently Asked Questions

Q: Does Lambert use a 5.0 scale for weighted GPA?
A: Yes, the weighted GPA scale goes up to 5.0, with AP/IB courses receiving a 1.0 weight and honors receiving 0.5. So a student with all A’s in AP courses would have a 5.0 weighted GPA.

Q: What is a good GPA at Lambert?
A: A GPA above 4.0 is considered strong because it indicates you’re taking advanced courses. The average GPA for admitted students to top colleges is often above 4.0 weighted. However, a good GPA depends on your goals and the colleges you’re targeting.

Q: How do I calculate my GPA if I have more than six courses?
A: You can use this calculator for the first six, then repeat with the remaining courses and average the results. For a more accurate cumulative GPA, you need to include all courses and their credit hours, which this calculator does not support.

Q: Are dual enrollment courses weighted the same as AP?
A: Yes, at Lambert, dual enrollment courses typically receive a 1.0 weight, same as AP/IB. However, check with your counselor because some dual enrollment courses may be weighted differently depending on the subject.

Q: Does this calculator work for middle school courses?
A: No, this calculator is designed for high school courses. Middle school courses are not typically included in high school GPA, unless they are high school credit courses, which would follow the same rules.

Q: What if I have a grade below 60?
A: Any grade below 60 is an F, which converts to 0.0 on the 4.0 scale. The calculator handles this by using a minimum of 0. So a grade of 55 would still be 0.0.

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in c1 | Course 1 Grade (0-100) | - | 92 | 0
in c2 | Course 2 Grade (0-100) | - | 85 | 0
in c3 | Course 3 Grade (0-100) | - | 78 | 0
in c4 | Course 4 Grade (0-100) | - | 88 | 0
in c5 | Course 5 Grade (0-100) | - | 95 | 0
in c6 | Course 6 Grade (0-100) | - | 90 | 0
sel w1 | Course 1 Type | Regular=0, Honors=0.5, AP/IB=1
sel w2 | Course 2 Type | Regular=0, Honors=0.5, AP/IB=1
sel w3 | Course 3 Type | Regular=0, Honors=0.5, AP/IB=1
sel w4 | Course 4 Type | Regular=0, Honors=0.5, AP/IB=1
sel w5 | Course 5 Type | Regular=0, Honors=0.5, AP/IB=1
sel w6 | Course 6 Type | Regular=0, Honors=0.5, AP/IB=1
out uw | Unweighted GPA | - | (round((min(max((c1-60)/10,0),4)+min(max((c2-60)/10,0),4)+min(max((c3-60)/10,0),4)+min(max((c4-60)/10,0),4)+min(max((c5-60)/10,0),4)+min(max((c6-60)/10,0),4))/6,2)) | 2
out w | Weighted GPA | - | (round((min(max((c1-60)/10,0),4)+w1+min(max((c2-60)/10,0),4)+w2+min(max((c3-60)/10,0),4)+w3+min(max((c4-60)/10,0),4)+w4+min(max((c5-60)/10,0),4)+w5+min(max((c6-60)/10,0),4)+w6)/6,2)) | 2