Event Attendance Rate Calculator
Calculate attendance rate and no-show count using registrations and recorded attendees from one event or event series.
How to use this calculator
- Enter registrations and recorded attendees for the same event scope.
- Check that all inputs use the same units, time period and population scope.
- Change one assumption at a time when comparing scenarios.
Formula used by event attendance rate calculator calculator
Attendance rate = recorded attendees ÷ confirmed registrations × 100%.
- Attendance rate = recorded attendees ÷ confirmed registrations × 100%.
- Use compatible attendee counts and decide how to handle staff, guests, walk-ins and multi-session attendance. This metric does not explain why people did not attend.
- The tool validates entered values and formats results for readability; it does not verify assumptions against external records.
Worked examples
Worked example
615 attendees from 750 confirmed registrations.
615 ÷ 750 × 100 = 82%; no-shows = 135.
Attendance rate is 82%, with 135 registrations not recorded as attended.
Understanding the result
Calculate attendance rate and no-show count using registrations and recorded attendees from one event or event series.
Use compatible attendee counts and decide how to handle staff, guests, walk-ins and multi-session attendance. This metric does not explain why people did not attend.
Important notes
Use compatible attendee counts and decide how to handle staff, guests, walk-ins and multi-session attendance. This metric does not explain why people did not attend.
Treat the result as an estimate based on the entered inputs. For regulated, engineering, employment, tax or business decisions, check applicable official rules, specifications and professional guidance.
Frequently asked questions
Can attendance exceed 100%?
Not with the same confirmed-registration denominator; verify walk-ins or duplicate counts if it does.
Does registration equal ticket sales?
Not necessarily; define the registration cohort consistently.
How should I use the result?
Use compatible attendee counts and decide how to handle staff, guests, walk-ins and multi-session attendance. This metric does not explain why people did not attend.
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This page provides a calculation tool plus explanatory information so you can understand what the result means and when the underlying method may not fit your situation.