Try out our new RRULE tool for creating RRULE compatible strings.

Property Name



This property defines the categories for a calendar component.

Value Type


Property Parameters

IANA, non-standard, and language property parameters can be specified on this property.


The property can be specified within "VEVENT", "VTODO", or "VJOURNAL" calendar components.


This property is used to specify categories or subtypes of the calendar component. The categories are useful in searching for a calendar component of a particular type and category. Within the "VEVENT", "VTODO", or "VJOURNAL" calendar components, more than one category can be specified as a COMMA-separated list of categories.

Format Definition

This property is defined by the following notation:

 categories = "CATEGORIES" catparam ":" text *("," text)

 catparam   = *(
            ; The following is OPTIONAL,
            ; but MUST NOT occur more than once.
            (";" languageparam ) /
            ; The following is OPTIONAL,
            ; and MAY occur more than once.
            (";" other-param)


The following are examples of this property



This document was automatically converted to XHTML using an RFC to HTML converter with the original text document at the Internet Engineering Task Force web site at .  The original text document should be referred to if there are any errors or discrepancies found in this document.

Need to test your iCalendar feeds?

The iCalendar Validator provides developers and testers a method to validate their iCalendar feeds, which can take data from either a URL, file or text snippet and compare it against the RFC 5545 specification.  We believe we have one of the best iCalendar validation tools available on the internet. More information about the validator can be found here.