How many volunteers does an event need?
Published on September 18, 2026
There is no universal ratio: two festivals of the same size can need twice as many people as each other. There is a method, though, and it comes down to four questions.
Why the headline figure means nothing
"We need a hundred volunteers" is a sentence that never checks out. A hundred volunteers over three days is not a hundred people present at once: it may be twenty-five at any given moment, and forty at the Saturday evening peak. The useful figure is not a total, it is a curve: how many people, on which position, at what time.
The method, in four questions
1. Which positions must be staffed, and for which hours?
List the positions, not the teams: "north entrance ticket desk", "bar 1", "car park", "water station at kilometre twelve". Each has an opening and a closing time, and those are not the event's: the car park opens before, the clear-up starts after.
2. How many people on each position, hour by hour?
This is where the accuracy of the estimate is won or lost. A bar needs two people in the early afternoon and six in the evening; a ticket desk needs the opposite. Declaring one single figure for the whole duration of a position leads to over-recruiting in the quiet hours and running short at the peak. See declaring needs by time slot.
3. How long should a slot be?
Four hours is the length that works best: long enough for someone to get a grip on the position, short enough for them to enjoy the event and come back next year. Beyond six hours in a row, drop-outs rise and the work gets worse. Divide each span by the slot length to get the number of people you need.
4. How much margin?
Add a small margin on ordinary positions, and line up named replacements on the critical ones, those that cannot be left empty: safety, cash handling, the start of a race. A flat thirty per cent margin everywhere costs a great deal in recruiting and in rewards, and protects you no better.
Orders of magnitude, to check the arithmetic
They do not replace the method above; they are there to tell you whether you are out by a factor of two.
- Music festival: roughly one volunteer per thirty to fifty festival-goers per day, highly variable depending on whether the bars and the campsite are run by volunteers or by contractors.
- Road race: the course matters more than the number of runners. Count the junctions to hold, the water stations, and the start and finish.
- Trail race: the number of checkpoints and how remote they are dominates everything, with night reliefs to staff in pairs.
- In-store collection: two to four people per store per two-hour slot, multiplied by the number of stores and opening hours. The most mechanical calculation of them all.
The figure that really counts: how full you are
Once the needs are declared position by position, the only useful question becomes "where are we short?". A fill-rate table tells you that you are six people short on the bar on Saturday evening, not that "the festival is seventy-eight per cent staffed". That is the figure that steers the end of your recruiting, and the only one that stops you recruiting when the need is already covered.
What follows naturally: building the schedule.
Frequently asked questions
Should permanent staff be counted as volunteers?
Count them separately: they are not recruited, they do not drop out in the same way, and they do not get the same rewards. They do occupy slots in the schedule, though, so they belong in it.
How do you size a position nobody has ever held?
Ask a comparable event in your area: most organisers answer gladly. Failing that, overestimate by one person and adjust after the first edition, because last year's figures beat every ratio.
Is it better to have too many volunteers or too few?
Too many on one position costs as much as a shortage: people get bored, feel useless, and do not come back. A margin aimed at the critical positions beats a margin spread everywhere.