How to combine multiple calendars into one

Most of us don't have a calendar — we have a pile of them: a work calendar, a personal one, your partner's, plus everything you've subscribed to (the kids' school, sports teams, the gym). Apple Calendar can show them together, but it can't fold them into a single calendar you own, sync everywhere, hand to someone else, or filter. Here's how to actually merge them.

The built-in ways (and where they stop)

Turn calendars on and off in Apple Calendar. Open Calendar, tap Calendars, and tick the ones you want to see. This overlays them in one view — handy, but it isn't one calendar: every device needs the same boxes ticked, you can't share the combined view as a single thing, and you can't trim a noisy feed down to what matters.

Subscribe to calendar links (.ics). If a school or team publishes a calendar link, add it under Settings → Calendar → Accounts → Add Account → Other → Add Subscribed Calendar. That pulls the feed in — but again, on each device separately, and it stays a separate calendar.

Export and re-import (Mac only). On a Mac you can select a calendar, choose File → Export, then File → Import it into another — which does genuinely merge the two. But it's a one-time manual copy (events added later won't follow), it's Mac-only, and you're left deleting the leftover calendar afterward. Fine for a one-off tidy-up; not a way to live with several calendars combined.

The honest limit: apart from that one destructive export trick, Apple gives you ways to view many calendars together, but no way to keep them merged into one real calendar you can own, sync, share, and filter.

The simpler way: one master calendar

Calends does the merging for you. You pick the calendars you already see in Apple Calendar — work (Outlook/Exchange, Google), iCloud, subscriptions — and it builds one master calendar — a real calendar that lives inside your Apple Calendar — out of them:

• It's a normal iCloud calendar, so it's on all your devices automatically.
• Keep it to yourself, or share it with anyone — they just subscribe, no app needed.
• A busy-only option shares when you're booked without the details.
• Keyword filters trim a noisy feed — e.g. keep only your child's class out of a whole-school calendar.
• It's 100% on your device and private iCloud — no servers, no account, no tracking.

Common questions

Can I merge a work calendar (Outlook / Exchange / Google)?

Yes — if it already shows up in Apple Calendar on your Mac or iPhone, Calends can include it. It never connects to your work account or asks for any permission (so there's no third-party "OAuth" access for IT to block) — it only reads what your device already syncs.

I use Outlook or Google Calendar, not Apple Calendar — does that matter?

No — you can use both. Calends works through Apple's built-in Calendar app, but your work or Google account can sit in Apple Calendar and in Outlook/Google at once. Adding it to Apple Calendar takes a minute in Settings and removes it from nowhere else; once it shows up there, Calends can include it. Some people add Apple Calendar just to use Calends.

Does it work across iPhone, iPad, and Mac?

Yes. The master calendar syncs through your own iCloud, so it appears on every device signed into your Apple account.

Is my data sent anywhere?

No. Calends has no servers and no account — everything stays on your devices and in your private iCloud.

Can people see the calendar without installing anything?

Yes. You share the master like any calendar, and they subscribe in their own calendar app. Calends is only needed on the side that builds it.

Related: How to share your availability without giving access to your calendar →