Free tool
Add one calendar to another
Pick where a calendar lives and where you want to see it — and get the exact, up-to-date steps to connect them, plus the honest limits of each method.
Where the calendar lives
Where you want to see it
Need the calendars to actually stay in sync?
SyncThemCalendars copies events between Google, Outlook and Apple iCloud calendars in near real time — one-way or two-way, with a privacy mode that can hide details behind a simple "Busy" block.
Start syncing freeFrequently asked questions
What's the difference between subscribing to a calendar and syncing it?
A subscription is a read-only snapshot that the target app refreshes now and then — you can look, but not touch, and updates lag by hours. A sync copies events between the calendars as real, editable events, in both directions if you want, usually within minutes or seconds.
Why don't new events show up in the calendar I subscribed to?
Subscribed (ICS/webcal) calendars are refreshed on the target app's schedule, not yours. Google and Outlook typically re-fetch every few hours and can take up to 24 hours or more; neither offers a manual refresh button. If you need changes to appear quickly, use account-level integration or a sync service instead.
Is Google's "Secret address in iCal format" safe to share?
Treat it like a password: anyone who has the URL can read the full calendar without signing in. Only paste it into calendar apps you trust, and if it ever leaks, reset it from the same "Integrate calendar" section in Google Calendar's settings.
Will the subscribed calendar show on my phone too?
Yes — subscriptions live in your account, not on one device. A calendar added to Google Calendar or Outlook on the web appears in their mobile apps automatically, and iPhone supports subscribed calendars natively via Settings → Calendar → Accounts.