Google Calendar or a spreadsheet for team availability?Four questions, and a clear answer.

Day-of awareness. Your team already lives in Google Calendar, so an all-day event on a shared Team time off calendar shows up right above their meetings, with no new tab and no new habit. On Monday morning you see who's out this week without opening anything.

On Google Workspace accounts, the Out of office event type adds something a spreadsheet can't: it declines meeting invites for those days automatically, with a message. That saves the person who's away a pile of rescheduling. Two catches matter. It only exists on Workspace, not on personal Gmail accounts, and it only lives on your own calendar, so teammates don't see it on a shared one.

It's also the lowest-effort place for people to enter their own time off. They're already creating events all day. If your team is small and you mostly need to know who's out this week, Google Calendar is hard to beat.

One row per person, one column per day. That shape is the whole point. You can see six people across six weeks on one screen, and gaps and overlaps jump out as patterns instead of as titles you have to read.

It counts. Say you have eight engineers in rows 2 to 9, and Thursday, December 10 is column K. =COUNTA(K2:K9) tells you how many people have anything marked that day, and =COUNTIF(K2:K9,"V") counts only vacation. A calendar can show you the events; it can't give you a number for a date.

It's also the easiest thing to start. Paste your team's names into column A and you're done with setup. If you want one already built, with US holidays and a too-many-out warning, the vacation calendar template is free, and I wrote up how I'd run one in a team vacation spreadsheet for engineering managers.

You can't see six people over six weeks. Six weeks is 30 working days, so that's 180 person-days, and the week view shows one week at a time. Month view stacks all-day events on top of each other and hides the overflow behind a “more” link, so the busiest days are exactly the ones you can't read.

Personal out of office is invisible unless it's shared. If Ana sets Out of office on her own calendar and forgets the shared one, you only find out when you try to book her, or when someone overlays her calendar. The Google Calendar guide has people enter each absence twice for this reason, and the second entry is the one that gets skipped.

Mixed time zones make half days confusing. Chloe in Portland enters a half day from 1:00 PM to 5:00 PM her time, and on your calendar in Boston it shows from 4:00 PM to 8:00 PM. All-day events don't shift, but all-day is the only kind of event that stays readable across the team.

It goes stale. People tell you about time off in Slack, in standup, in a hallway, and someone has to type it into the sheet. Usually that's you. Miss one message and the sheet is wrong without looking wrong.

Nobody opens it. A spreadsheet doesn't appear above anyone's meetings and doesn't remind anyone of anything. Google Sheets can email you when the file changes, but nothing tells you that two people are out tomorrow. The sheet only helps when someone remembers to look before the sprint is planned.

Edits collide. Google Sheets copes with two people typing at once, but one person sorting a range while another fills in a row can scramble a week, and an Excel copy that got downloaded and emailed around becomes a second version of the truth. The bigger the team, the more often it happens.

1. How many people? Up to about six people in one time zone, a shared calendar is enough, because you can hold the whole team in your head. By eight or so, you need rows, and that means a spreadsheet. 2. How far ahead do you plan? If your horizon is this week and next, use the calendar. If you plan sprints or releases four to twelve weeks out, you need the wide view only a sheet gives you.

3. Do you need counts on specific dates? If a release date, a code freeze or an on-call handoff depends on how many people are around, you need a number per day, and only the sheet does arithmetic. Before you commit to a date, run through the availability checks before choosing a release date. 4. Will people actually update it? Be honest. If your team won't open a spreadsheet, a calendar they already use will be more accurate. If you're willing to be the one who types it in, the sheet works.

Here's the answer. If you got “calendar” on all four, use Google Calendar and stop there. If you got “sheet” on question 2 or 3, which is most engineering teams that ship on a schedule, plan in a spreadsheet and keep the calendar for the day-of view. That's the setup below.

Give each tool one job. Google Calendar is for today: each person marks their own time off there, as Out of office on Workspace (so invites get declined) or as an all-day event on a personal account. The spreadsheet is for planning: it's the one you look at in sprint planning and before you pick a release date, and it's the one that's right when the two disagree.

Pick one day a week to reconcile, like Monday morning or the hour before sprint planning. Open the shared calendar for the next two weeks next to the sheet, copy anything missing, and ask about anything that looks off. It takes about ten minutes for eight people, and it catches most of what slipped through Slack.

Put the team's own dates in the sheet too: release days, code freezes, the offsite. A column header that says Release 4.2 turns a grid of names into a planning tool. When you plan the sprint itself, how to plan a sprint when three people are away picks up from there.