A 4.0 is good enough, but try to get a 5.0 because someone with a slightly higher grade can get admitted.
Again, Harvard does not set a certain boundary on what your GPA should be, but you might want your GPA to be very close to perfect.
Roughly 600 to 800 on each section of the SAT. http://www.admissions.college.harvard.edu/apply/faq.html#7
4.5 and1
There is no accorate GPA to get on harvard
3.0
The average GPA standards for Harvard is at the least a 3.9. Most students who get in have a GPA of 4.0. It also depends on how well you do on your SATs. Most scores are ranged between 2300 to 2400(the full score).
3.5 - 4.0
Might be not. They didn't open their GPA score of accepted students but it's known as around 3.7. And other test scores are high. check out the harvard admission requirements and scores.
Yes
this is the GPA you need to get a 2.0 GPA
4.0 maybe lower but that's the easiest way to get in.
I don't know the exact GPA required for Harvard. But you definitely need to get awesome grades. An awesome GPA and a great SAT score is a must. After you accomplish this, start thinking about ways you can separate yourself from the competition. Extracurricular activates are very important. Lastly, make sure you want to go to Harvard. I know a lot of students that thought they wanted to go to their dream school, but when they got in and went to that school, they were really disappointed. You can get information about the academic requirements here: http://www.unigo.com/harvard_college/rankins and reviews of Harvard by actual students here: http://www.unigo.com/harvard_college/reviews