The Calendars app on the iPhone and iPad can keep track of all your events and appointments, all in one place. But it doesn't have to keep them all in the same calendar. If you prefer to keep your work life and personal life separate, or to have a specific calendar for kids activities, or a special vacation, or for anything else, you can easily do so. Since each calendar gets its own color, and you have the ability to hide or show individual calendars, it's a great way to stay organized and stay sane at the same time. Additional calendars are easy to setup, and if you ever stop needing them, they're easy to delete as well.
Give the new calendar a name and a color to represent it.
Tap Done in the upper right hand corner.
That's it! Your new calendar is now available for you to start adding events to! When creating a new appointment, meeting, or other kind of entry, just choose your new calendar under the calendar section.
How to delete calendars on your iPhone and iPad
Launch the Calendars app on your iPhone or iPad.
Tap on Calendars at the bottom.
Tap on Edit at the top.
Tap on the calendar you'd like to delete.
Tap on Delete Calendar. It's located all the way at the bottom.
Tap Delete Calendar one more time on the popup that appears.
The calendar should now disappear as will all the events that were in it. Keep in mind that sometimes subscribed calendars and CalDAV subscriptions need to be deleted a different way through the Settings app. So if you don't see a delete button and that's what you're trying to delete, try through the Settings app just like you did to add the subscription.