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Water Requirement For Event Calculator

Work out water requirement for event instantly with clear inputs, formula shown and shareable results.

About Water Requirement For Event Calculator

Water use is attendees times hours times the hourly rate, doubled for hot weather or physically active events, and tap provision assumes about six litres a minute per outlet. Free water provision is a licensing requirement at most alcohol-serving events, and the tap count matters because queues rather than supply are the usual failure.

Formula

Water needed

litres = attendees x hours x litres per person per hour x weather multiplier

Worked example

With the default values below, Water Requirement For Event Calculator returns Drinking water required of 2,400.0. Change any input above and every figure here is recalculated in your browser.

Inputs used

Attendeesminimum 1
800
Event durationminimum 0.5 h
6 h
Drinking water per person per hourminimum 0.01 L
0.25 L
Hot weather or active event
Yes

Results

Drinking water required
2,400.0 L
500 ml bottles equivalent
4,800
Drinking water taps needed
2
Water per person for the event
3.000 L

Step by step

  1. 1Values used
  2. 2Water needed
  3. 3Drinking water required= 2,400.0 L
  4. 4500 ml bottles equivalent= 4,800
  5. 5Drinking water taps needed= 2
  6. 6Water per person for the event= 3.000 L

Assumptions and limits

  • The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
  • Figures are rounded for display to 3 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

How is the Water Requirement For Event figure worked out?

litres = attendees x hours x litres per person per hour x weather multiplier. Water use is attendees times hours times the hourly rate, doubled for hot weather or physically active events, and tap provision assumes about six litres a minute per outlet.

Why does this matter?

Free water provision is a licensing requirement at most alcohol-serving events, and the tap count matters because queues rather than supply are the usual failure.

What do I need to enter?

Enter attendees, event duration, drinking water per person per hour, hot weather or active event. The defaults shown are a realistic worked example — swap in your own figures to get a result you can use.

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