can I transfer my contacts from iPhone to gmail contacts?
Try setting up your gmail account as an exchange account on your phone as explained here: http://support.google.com/a/users/bin/answer.py?hl=en&answer=138740, and turn on contacts syncing.
Since end of 2012, Google has ended support for the Exchange protocol, so you would not be able to sync your iPhone contacts with your Gmail account via Exchange. try this:
1. Download and install "CopyTrans Contacts" to your PC: http://www.copytrans.net/copytranscontacts.php
2. Run the tool and connect your iPhone. Your iPhone contacts will begin to populate and display on your computer screen, Click on the “Export selected” and choose “Gmail” format, select the location on your PC where you want to save the contacts. Your iPhone contacts will be saved as a single vCard file
3. Now, go ahead and login to your Gmail account. Navigate to Gmail > Contacts, click on More > Import
4. Click on “Browse…” and Navigate to the location where you saved the contacts file, click “Import”. Now Your iPhone contacts have now been transferred to your Gmail
If you use iTunes, you may try to follow this guide.
http://support.apple.com/kb/HT2109
If you've problems while using it, try to follow this guide.
can I transfer my contacts from iPhone to gmail contacts?
