There are a apps available as well as a few lengthy tutorials with various methods of getting your calendars in sync, but a quick and easy setup will have your iPhone and Google Calendars up to date in just one minute. Follow the simple 3 step process after the break.
How to set up your iPhone or iPod Touch to sync calendars with Google over the air:
1. On your iPhone, go to Settings > Mail, Contacts, Calendars > Add Account > Other > Add CalDAV Account
2. For the CalDAV settings, enter the following information. Note that your username should be the email address you use to access your Google calendar as well as the password.
3. Then tap “Next” and it should verify your information.
4. If you can’t get your account verified, tap “Advanced settings” and make sure that “Use SSL” is On, that the port is 443, and that your Account URL includes the sign “@” in your email address.
I just set this up and immediately checked my iPhone calendar for appointment I recently entered only in Google Calendar and I’m happy to report a successful sync has occurred.