Transferring your gmail contacts from one account to another can be tedious. However there is a simple export and import facility in Gmail contacts that can come very handy.
Login to your gmail account and click on “Contacts”
Now click on “Export” in More
Export all the contacts and save the file in your computer.
Similarly now login to your gmail account and go to “Contacts” -> “More” and import the contact file that you had exported earlier.