A method of scheduling alerts based on location-based reminders and calendar events includes receiving, at one or more computing devices, a location-based reminder including a reminder location having a reminder proximity level. The method further includes receiving, at the one or more computing devices, a calendar event including a calendar event location and a calendar event duration. If the reminder location matches the calendar event location based on the reminder proximity level and the calendar event duration, the method further includes determining, using the one or more computing devices, a time to provide an alert.