Gpa math

Hi I don’t know how to do gpa math because when I do it it’s different than when I do it online and when I do it online each website says something else. So my GPA now is 2.92, assuming I get a 4.0 from now on( don’t tell me it’s unlikely, I got a 4.0 my last semester of sophomore year) from now until the end of junior year, what is my highest uw gpa? Also can you tell me my weighted, if I get straight A’s next year I will have around a 4.2 weighted GPA( two ap’s and one honor.) thank you for taking the time to answer for those of you who did

No one can calculate your gpa for you without knowing the number of classes and the number of credits taken. But as a ballpark, if you have a cumulative 2.92 at the end of sophomore yr, and get a 4.0 jr yr, you will have approx a 3.28 uw.
For weighted, you need to know how much your school weights. For instance, some schools will weight an AP class a full point, others may weight it .33 point, some schools not at all