You can put a 4.5 high school GPA on your resume only if you are applying for a job—straight out of high school, or while you are in college—that requires a resume submission. In all other cases, you can leave your high school GPA off your resume.
If you’re applying for jobs after college ends, you can consider including your college/university GPA on your resume, but only include it if it’s a 3.5 or higher. What you did in high school, including your academic performance, is no longer relevant after college (in most cases). Including a high school GPA on your resume after college will take focus away from college achievements you should consider profiling on a resume. These would include things like internships (which could count as work experience), or involvement with any clubs, associations or activities that are tied to the field you’re aiming to launch a career in.
Including a GPA on a resume is typically not mandatory (except in cases where the job advertisement notes that a GPA must be included in a resume). There is no need to include your GPA if it is not requested. Including a strong GPA on a resume really only comes in handy for those with little work experience. If your high school or college GPA is low (below a 3.5) and an employer does not request it, leave it off your resume.
A 4.5 GPA can help you get into college, but it may not be the best thing to put on a resume. In the event you are still in high school and apply for jobs, then listing a high GPA may help you because you probably do not have a lot of work experiences to discuss. However, if you graduated from high school a while ago, then it is time to leave your GPA off. You should put a 4.5 high school GPA on your resume as long as you are in high school. However, it may work more to your advantage to focus on awards and accomplishments than a simple number. For example, if you are a National Merit Scholar, then you will be better off mentioning that than a GPA. When you apply for jobs in college, you want to leave information about high school off your resume. The reason for this is that employers want to know where you are in your life now. Focusing on your high school life when you are in your 20s shows you may have not advanced much since you were a teenager.