Facebook Event Attendance Prediction Calculator

1. Open a similar event you ran before. Note its Going count and how many people came through the door.
2. Enter the Going count for the event you are planning now.
3. Add Interested counts, a second past event, your capacity and a buffer for the extra results. All are optional.

Facebook event attendance prediction is an estimate of how many people will turn up, based on the responses on the event page. A response is a click, not a ticket. Some people who respond Going stay home, and some who never respond walk in.

Facebook Help lists the responses a host can see. A public event shows Going and Interested. A private event shows Going, Maybe and Can't go. Guests can choose to hide their response from other guests.

The platform does not publish a show-up rate, and no fixed share of Interested people is known to attend. The only rate that fits your audience is the one your own past events produced.

This calculator is for hosts, venue managers, community organisers and small businesses. It is not a ticketing forecast and it does not replace a registration list.

The calculator scales your current responses by a rate measured at your own past event.

1. It divides past attendance by past Going responses.
2. With two past events, it pools them: total attendees divided by total Going responses.
3. It multiplies the current Going count by that rate and rounds to a whole person.
4. It applies the lower and higher single-event rates to give a range.
5. It adds your buffer and compares the result with your capacity.

No modifier is applied for event type, reminders or paid promotion. No published figure supports one.

Example values only. A host ran two workshops. The first had 120 Going, 300 Interested and 78 attendees. The second had 80 Going and 60 attendees. The next workshop shows 160 Going and 400 Interested. The room holds 120.

The estimate of 110 fits the room. The top of the range equals the capacity of 120, and the planning headcount of 121 passes it. The host should cap responses or find a larger room.

How Similar the Past Event Was

A rate from a free evening talk does not carry over to a paid weekend course. Use a past event with the same price, day and audience.

Paid Promotion

Meta counts an event response from an ad as a person who responded Interested or Going. This page applies no adjustment for promotion. To keep the comparison fair, use a promoted past event for a promoted current one.

The Size of Your History

One past event with 45 Going responses gives a rough rate. Two events with 200 Going responses in total give a steadier one.

Walk-Ins and Guests

People who attend without responding raise your measured rate. It can pass 100%. The calculator allows that and reports no expected no-shows.

Timing of the Count

Responses keep arriving until the event starts. Take the current count at the same point before the event as you did last time, such as two days ahead.

The two responses signal different levels of intent, and the platform reports them in different places.

In the example, 78 attendees from 420 total responses is 18.6%. Applied to 560 current responses, that gives 104 people. The two methods agree within the range, which adds confidence. A wide gap between them means the mix of Going and Interested has changed since last time.

Ordering Food and Drink

Use the planning headcount as the order quantity. The party food and drink calculator and the wine for a party calculator turn a headcount into amounts.

Choosing a Room

Compare the top of your range with each venue. A room that holds only the middle estimate leaves no margin.

Deciding Whether to Close Responses

When capacity used passes 100%, the event is over-subscribed on your own history.

Reviewing After the Event

Record the real attendance. Track the share that came with the attendance calculator, then use the new rate next time.

1. Counting Every Going Response as a Guest

At a 69.0% rate, 160 Going responses mean about 110 people and 50 no-shows.

2. Using a Generic Show-Up Rate

Figures such as "half of Going attend" have no published source. Measure your own.

3. Adding Interested and Going with One Rate

A Going rate applied to Interested people overstates turnout. The all-responses check uses a rate measured on both together.

4. Mixing Ad Responses with Guest Counts

Meta notes that event responses from an ad can differ from the Going and Interested totals on the event. Organic responses are not in the ad figure. Use the guest list numbers.

5. Trusting One Small Event

A past event with under 20 Going responses gives an unstable rate. The calculator shows a warning.

6. Planning to the Exact Estimate

The estimate is a centre point. Add your own buffer, and check the range.

The arithmetic is exact. The estimate is only as good as the match between your past event and the next one.

A range from two events is not a statistical confidence interval. It shows what your own two results would have produced. Work out other shares with the percentage calculator.

No official figure exists. The platform publishes no show-up rate, so the reliable number is your own: past attendees divided by past Going responses.

It varies by event and no published rate exists. Measure it by dividing past attendance by past Going plus Interested, as the all-responses check does.

Open the event, scroll to Guests and click See all. Facebook Help says a public event lists Going and Interested, and a private event lists Going, Maybe and Can't go.

Yes. When walk-ins outnumber no-shows, more people attend than responded Going. The calculator accepts that and scales the estimate the same way.

That is your choice and depends on the cost of running short. The range from two past events shows how far your own turnout has moved.

Meta says the event page total is usually higher because people also respond organically, without seeing the ad.

No. Without a past event there is no measured rate, and this page will not supply a generic one. Use registrations or tickets for a first event.

Use two when both are similar to the next event. Pooling 200 Going responses gives a steadier rate than 120, and you also get a range.

No. Maybe appears on private events only, and this page has no input for it. Use the Going count as the base.

No. The maths runs in your browser and nothing is sent to us. Save keeps a result only in this browser.

• See who responded to your event invitation: Going, Interested, Maybe, Can't go (Facebook Help Centre, read 2026-10-02; opens in a browser, blocks automated checks).
• About event ad metrics: event responses and organic responses (Meta Business Help Centre, read 2026-10-02; opens in a browser, blocks automated checks).
• Page Insights: metrics about your Page events (Facebook Help Centre, read 2026-10-02; opens in a browser, blocks automated checks).