Best methods/tools for reliable academic weighted average calculation?

Hi,

I’m helping a friend who’s currently studying in a university program and needs accurate ways to compute their General Weighted Average (GWA) across multiple subjects. Since many DevOps roles today also hinge on attention to detail and analytical skills, I thought I’d bring this topic here—especially because students in tech fields often juggle academic tracking with real-world projects.

Manual computation can get tricky when you have different unit values and decimal grades across subjects. To make this easier, I found an online GWA calculator for students that lets you input subject grades and units and instantly get an accurate weighted average, plus GPA and percentage equivalents.

Has anyone here used tools or scripts (even basic ones) to automate weighted average or similar statistical calculations in their workflow? If so, what methods or tools do you recommend to ensure precision and efficiency?

Thanks in advance—looking forward to hearing your strategies!