Google Calendar’s multi-calendar export downloads as a ZIP archive containing individual ICS files. The archive is a container, not the file you should select for an ordinary Calendar import. Match each contained calendar to its intended destination before adding any events.
Inspect the archive safely
Use a trusted export and extract the ZIP with your normal archive tool. Review the filenames and identify which calendars they represent. Keep the original archive unchanged as a reference, and avoid assuming every contained calendar should be merged into your primary schedule.
Import one identified ICS file
On a computer, open Calendar’s Settings > Settings > Import & export. Select an extracted ICS file and choose the correct destination calendar. Review the selection before importing. Repeat deliberately for another calendar only when it is actually part of the migration.
Google’s guidance says exported calendars can be imported into other calendar applications, but an import creates copies. It does not establish a live relationship with the exported calendar.
Verify each destination separately
Check representative events, recurrence, all-day spans, and time zones in the destination. Record which source file was imported where so an interrupted migration can resume without repeating completed imports. Guest and conference information is not imported with the event copies. Keep room reservations and current invitation ownership separate from the migration result. If one calendar is missing, inspect its specific file and permissions rather than importing the entire archive again. A clear file-to-calendar record helps avoid duplicate entries and makes it possible to distinguish an omitted source calendar from an already imported calendar that is simply hidden in the current view.
References
Reviewed against the linked official product guidance on November 4, 2026. Features, limits, screen labels, and access can vary by account, platform, region, and organization policy.