Webinar Attendance Rate Calculator

Understanding the webinar attendance rate calculator — concept and principle

The webinar attendance rate tells you what share of the people who registered actually showed up live. Marketers, trainers and event teams use it to judge how well their reminders, timing and topic worked, to forecast audience size for the next event and to report results. Because many people register only to get the recording, the calculator also shows total reach including replay viewers.

How it is calculated

• Live attendance rate = live attendees ÷ registrants × 100
• Total reach = (live attendees + replay viewers) ÷ registrants × 100

Registrants are the people who completed the sign-up form. Live attendees are unique people who joined the live session at least once. Replay viewers are unique people who watched the recording but did not attend live; if your platform counts them separately, avoid counting the same person twice.

The principle

Registration is a weak, free commitment, so a gap between sign-ups and attendance is normal. The rate isolates that drop-off from everything before it (how many people saw the invitation) and makes events of different sizes comparable: 340 out of 900 and 34 out of 90 are the same performance. Adding replays answers a different question, namely how much of the registered audience consumed the content at all, which matters when the goal is education rather than live interaction.

Worked example

1. Live attendance rate = 340 ÷ 900 × 100 = 37.78%.
2. Live plus replay = 340 + 150 = 490 people.
3. Total reach = 490 ÷ 900 × 100 = 54.44%.

So a little over a third came live, and more than half saw the content in some form.

How to read the result

Vendor benchmark reports often put typical B2B live attendance roughly in the 35–45% range, but results vary strongly with audience, price (free events see more no-shows), time zone and lead time. The most useful comparison is with your own previous webinars run under similar conditions. A low live rate with a high replay share suggests the timing is the problem, not the topic.

Common mistakes

• Counting total logins instead of unique attendees, which inflates the rate.
• Including people who registered after the event only to get the recording.
• Comparing a free open webinar with a paid or invitation-only session.
• Double-counting people who attended live and also watched the replay.

Frequently asked questions

How can I raise webinar attendance?

Common levers are reminder emails the day before and an hour before, a calendar invitation, a clear agenda and a time slot that suits the main time zone of the audience.

Should I calculate the rate on registrants or on confirmed registrants?

Either works if you are consistent. Using only confirmed or verified e-mails gives a higher, cleaner rate.

Does the rate include panelists and staff?

It should not. Exclude hosts, speakers and internal test accounts from both numbers.

Sources: ON24, Webinar Benchmarks Report (published annually)