Calculating GPA as a homeschool parent feels strange the first time. There is no school registrar, no transcript office, no formula handed down from administration. You are the administrator. The 4.0 scale you remember from your own high school still applies: A is 4.0, B is 3.0, C is 2.0, D is 1.0, F is 0.0. But a few things shift when you are running the numbers yourself.
You decide which courses count. You decide which courses are weighted (Honors at 4.5, AP and Dual Enrollment at 5.0). You decide whether middle school courses appear on the high school transcript. You decide whether to use plus and minus grades or stick to whole letters. There is no single right answer, only the answer that is consistent across the whole transcript and that you can explain to admissions officers if asked.
This calculator handles the math so you can focus on the decisions. Add a course, enter the grade, set the credits (most full-year courses are 1.0 credit, most semester courses are 0.5), choose the weighting type, and the GPA updates as you go. Both weighted and unweighted figures appear, since most colleges want both. Your data saves to your browser automatically: close the tab, come back tomorrow, your courses are still there.
The unweighted GPA is the credit-weighted average of your grade points. Each course contributes grade points times credits to the total, and the total is divided by total credits earned. A 1.0-credit A is 4.0 grade points; a 0.5-credit A is 2.0 grade points. A year-long course counts twice as much as a semester course of the same grade.
Weighted GPA gives extra grade points for harder courses. Honors courses earn one extra half-point (A becomes 4.5). AP and Dual Enrollment courses earn one full extra point (A becomes 5.0). The exact weighting can vary by college, so most homeschool families use the most common system: 4.0 / 4.5 / 5.0 for Regular / Honors / AP-DE.
The cumulative GPA at the end of high school is what most colleges report on admissions decisions, but the per-year breakdown helps you see academic trends.
Most homeschool families use this calculator at four key moments. First, at the end of each semester to check that grades are recorded correctly and the running GPA is on track. Second, when building the transcript for college applications, needed by every US college, usually due January through March of senior year. Third, when applying for scholarships, since many merit scholarships have GPA cutoffs (3.0, 3.5, 3.7) and require transcripts showing the GPA. Fourth, for state reporting in states like Pennsylvania and North Dakota that ask for academic progress including GPA on annual paperwork.
If you have just finished a semester and want to update your records, start with this calculator and then move to the transcript builder.