How to See All My Calendars in One Place

The problem, honestly stated

Search "see all my calendars in one place" and you mostly get listicles written by people who have one calendar. If you are a consultant, contractor, or fractional exec, you have four or five: a personal Google account, your own business calendar, and a managed Microsoft 365 account from every client you work with. This guide walks through the three real ways to get all of them into one view, what each way requires, and exactly where each one breaks.

The hard part is never the calendars you own. It is the accounts your clients issue you. You do not control those tenants, and since November 2025 Microsoft Entra's default settings block users from consenting to third-party apps that request calendar permissions, so the usual "just connect your account" tools now need an admin to approve them on most managed tenants. We wrote up what changed in that Microsoft default if you want the details.

Option 1: consolidate everything on one provider

If you own every account, the cleanest fix is fewer accounts. Forward invites to a single address, or migrate old calendars into one Google or Microsoft account and retire the rest. Zero new tools, zero cost.

It breaks the moment a client hands you a managed account. You cannot migrate a client's calendar into your personal Google account, and quietly copying their meeting data into an account they do not control can violate their security policy even when export technically works. For anyone juggling client tenants, consolidation is a partial answer at best.

Option 2: subscribe with ICS feeds

Every major calendar can publish a read-only ICS feed, and every major calendar can subscribe to one. Google has a secret iCal address per calendar, Outlook has calendar publishing, and most niche tools export .ics. Subscribe each calendar to the others' feeds and you get cross-visibility inside the apps you already use, including on your phone.

Two catches. First, refresh lag: providers update subscribed feeds on their own schedule, often every few hours and sometimes longer, so a meeting moved this morning may not show until this afternoon. Second, feeds only exist if the admin allows them. Managed tenants frequently disable calendar publishing and hide the secret address, and there is nothing you can click to turn them back on.

If feeds are available to you, use them. They are free, standard, and durable. The free plan of manyCalendars accepts unlimited feed URLs and .ics files precisely because this is the right first move.

Option 3: merge them in your browser

manyCalendars is a desktop browser extension that merges every calendar into one local view. Feeds and .ics files are free and unlimited, with month, week, and day views and per-calendar color coding. Everything is 100 percent local, no account needed, and nothing is uploaded anywhere.

For the accounts that cannot publish a feed, Tab Sync (a Pro feature) closes the gap. Open the calendar in a browser tab, signed in as you normally are, and turn Tab Sync on. The calendar follows that tab into your merged view. There is no OAuth grant, no API connection, and nothing for an admin to approve, which is why it works when IT says no. It is read-only on the source, so nothing you do in the merged view can touch a client's data.

Step by step: one view in about ten minutes

1. Install manyCalendars in your desktop browser. The 14-day full trial starts on install, no card, no account.
2. Add your first calendar: paste an ICS feed URL or import an .ics file. Manual calendars are unlimited on the free plan.
3. Repeat for every account that allows a feed, using Google's secret iCal address or Outlook's published calendar link.
4. For the accounts that do not allow feeds, open each one in a browser tab, signed in as normal, and turn on Tab Sync. Each calendar follows its tab.
5. Color code each calendar so clients are distinguishable at a glance.
6. Pick month, week, or day view and start planning from one screen.

What this will not do

Three honest limits. manyCalendars is a desktop browser extension only, so there is no phone app. Tab Sync reads what is visible in a tab you are signed into, so if you sign out of a client calendar, that source stops updating until you sign back in. And the merged view is read-only on the source: you edit or join events in the original calendar, not in the merged view.

If you specifically need events copied between accounts on a server, that is a different job, and tools like CalendarBridge do it well where an admin will approve the connection. Our comparison covers the trade-offs: manyCalendars vs CalendarBridge.

What it costs

Feeds and .ics files are free forever, with unlimited calendars. Tab Sync comes with Pro at $15/month or $150/year (which works out to $12.50 a month), along with meeting reminders, a custom work-week view, time zones, and .ics export. Premium at $29/month or $290/year adds Privacy Mode, cross-calendar conflict detection, auto-block busy mirroring, and share availability. Teams pay $39 per seat per month with a 2-seat minimum. Full details are on the pricing page.

Every install starts a 14-day full trial with everything unlocked. No card, no account. Install manyCalendars free and see your whole week on one screen today.