Every function planner has been handed the same line at some point: a kilo of ice per person, she'll be right. It's the ice equivalent of "allow a bottle of wine each" — close enough to sound authoritative, and wrong often enough to leave you sending someone to the servo at 8pm on a Saturday for six bags at triple the price.
The kilo-per-head rule fails for one specific reason: it assumes all your ice goes into glasses. At a real function, most of it doesn't. It goes into tubs to chill bottles, into a seafood display, and into the gap between what you ordered and what actually survived four hours in a Brisbane December. Here are the numbers I'd use and the maths behind them.
Start at 1.5 kg per guest, not 1 kg
For a standard indoor Australian function — four hours, full bar, some bottled product on ice — 1.5 kg per guest is the number that stops you running short without leaving half a pallet melting in the car park.
Move it to 2 to 2.5 kg per guest if any of the following are true: the event is outdoors, it's between November and March, you're running a raw bar or oyster station, or the bar is more than about 20 metres from wherever the ice is stored.
You can go back down to roughly 1 kg per guest for a short indoor event — a two-hour launch, a 5–7pm networking drinks — where guests are holding a glass of sparkling and nobody's ordering spirits. That's the shortcut. To be right rather than approximately right, build it from the three jobs ice is doing.
Ice is doing three jobs and only one involves a glass
Split your order into three lines and the number stops being a guess.
1. Drinks ice — 0.3 kg per guest per hour. This is the ice that goes in the glass. It sounds like a lot until you remember a single rocks pour holds 150–200 g and gets remade every 20 minutes. Spirits-heavy crowds push toward 0.35; a wine-and-beer wedding sits nearer 0.25.
2. Chilling ice — about 20 kg per tub. A standard 60–70 L galvanised tub or wheelie bin holds roughly 10 kg to fill the gaps around the bottles, plus another 10 kg when you top it up mid-service. Budget one tub per 40 guests for a beer-and-bubbles crowd.
3. Display ice — 15 to 25 kg per station. A seafood table, an oyster shucking station or a chilled dessert display eats ice and gives nothing back. It also needs to be replaced entirely, not topped up, once the melt water starts pooling.
Add the three, then multiply by a heat factor: 1.0 indoors and air-conditioned, 1.15 for a shaded outdoor event under 28°C, 1.4 for anything above 32°C or in direct sun. That last multiplier is not padding. An open tub in 35°C sun loses 30–40% of its ice in under two hours.
Three worked examples
60-guest indoor cocktail function, 3 hours, air-conditioned.
Drinks: 60 × 3 × 0.3 = 54 kg. Two tubs: 40 kg. No food station. Total 94 kg × 1.0 = 94 kg, order 20 bags (100 kg). At around $4.20 a bag that's roughly $84 plus GST — which is under most suppliers' delivery minimum, so you're either collecting it or bundling it with the beverage order.
150-guest wedding reception, 5 hours, outdoor arrival then indoors, October.
Drinks: 150 × 5 × 0.3 = 225 kg. Four tubs: 80 kg. One canapé display: 20 kg. Total 325 kg × 1.15 = 374 kg, order 75 bags. Roughly $315 plus GST and delivery.
300-guest corporate Christmas party, 4 hours, outdoor terrace, 35°C.
Drinks: 300 × 4 × 0.3 = 360 kg. Eight tubs: 160 kg. Two stations: 40 kg. Total 560 kg × 1.4 = 784 kg, order 160 bags (800 kg). About $670 plus GST, and at that volume you should be asking for pallet pricing rather than paying by the bag.
Notice that the per-guest result lands between 1.6 and 2.7 kg in all three. That's the honest range. The one-kilo rule would have left the Christmas party 500 kg short.
What you're actually buying, and what it costs
Australian bagged party ice is sold in 5 kg bags at roughly $3.95 to $4.50 plus GST from a dedicated ice supplier, and $6 to $9 from a bottle shop or service station. Bulk options run from 10 kg bags up to 500 kg and 1,000 kg bins, and most metro suppliers will do a pallet of around 195 × 5 kg bags in insulated foil wrap, which is the format designed to survive an all-day event.
The catch is delivery minimums. Sydney suppliers typically want $150 minimum on weekdays and $250 on weekends, and on genuine peak days — Melbourne Cup, the Saturday before Christmas, New Year's Eve — minimums go up and delivery windows get wide. Book peak-season ice at the same time you book the venue, not the week of.
If you're a venue rather than a one-off event planner, the comparison that matters is delivered ice at $0.50–$1.50 per kg against your own machine at $0.08–$0.20 per kg once you count water, power and filters. We ran that whole model — capital cost, running cost, break-even volume — in our guide to commercial ice costs in Australia.
Where a third of your order disappears
The most common way to be short on ice isn't underordering. It's storage. Ice delivered at 9am for a 6pm function needs somewhere below −12°C to sit. A chest freezer at −18°C will hold bagged ice indefinitely. A cool room at 2°C will not — you'll lose 15–25% by service time and the rest will have fused into a single block you have to attack with a mallet.
Three things that reliably save ice on the day:
- Leave it bagged until you need it. An unopened bag in a closed esky loses about 10% over four hours. The same ice tipped into an open tub at the start of service loses three times that.
- Separate your tub ice from your drinks ice. Once staff start scooping glass ice out of the bottle tub, you've contaminated it with bottle caps and label glue, and you'll burn through the clean supply twice as fast.
- Order in two drops if the function runs past four hours. A second delivery at 4pm costs less than the 200 kg you'd otherwise lose melting since morning.
One more thing worth knowing: bigger cubes melt slower, which is a service benefit and not just a look. Surface area, not volume, drives melt rate — which is also why cheap flake ice waters a drink down in minutes. We covered the physics of that in why your cocktails are watery.
The ice that doesn't come in a bag
Everything above is bulk supply, and bulk supply is a commodity — nobody photographs it and nobody remembers it. The one part of a function's ice that does get noticed is the handful of cubes in the drinks that get put in front of people: the head table, the VIP table, the sponsor's whisky, the CEO's welcome drink.
That's a different product entirely. Bagged cube ice is 25–30 mm and cloudy. A large-format 45 mm cube with a logo or a name raised on the face is something a guest looks at, turns in the glass and photographs — and no ice supplier in the country will make you 200 of them for one night.
The practical version for a function is a fully custom logo tray at $199.95, moulded with your client's logo, event name or date. Each tray makes six 45 mm cubes per fill, and a tray freezes in about eight hours at −18°C — so one tray run overnight and again through the afternoon comfortably covers a head table and a VIP round. Two or three trays cover a sponsor's activation bar. You can see the full range in the branded ice cube tray collection, or the initial-and-year format in the monogrammed trays if the event is a wedding or an anniversary rather than a corporate booking.
For event planners quoting this to a client, it's worth knowing it reads as a styling inclusion rather than a beverage cost — which is a different budget line and a much easier yes. We broke down how that works for one-off events in branded ice for corporate events, and for permanent venue service in branded ice for bars.
Ice is food, and the regulator agrees
This catches people out, particularly at outdoor events where the ice is being handled by casuals. Under the Australia New Zealand Food Standards Code, ice is a food. Standard 3.2.2 covers contamination control and cleaning of food-contact surfaces, and ice-contact surfaces count — which means the scoop, the tub, the bin and the hands.
In practice that means: scoop only, never a glass used as a scoop (a chipped glass in an ice well condemns the whole bin), keep a dedicated scoop in a holder rather than buried in the ice, and never reuse ice that's been sitting in a bottle tub for drinks. Food Standards Australia New Zealand publishes the plain-English version in Safe Food Australia, and the Packaged Ice Association of Australasia publishes a code of practice worth reading if you're contracting a supplier for a large event.
The order sheet
Copy this into your run sheet and you're done:
- Drinks ice: guests × hours × 0.3 kg
- Tubs: one per 40 guests, 20 kg each
- Displays: 20 kg per station
- Heat factor: ×1.0 indoors, ×1.15 shaded outdoors, ×1.4 above 32°C
- Divide by 5 for the number of bags, then round up to the next 10
- Check the delivery minimum before you assume a small function gets delivered at all
If you're a venue building this into a per-head package price rather than quoting it as a cost, the structure we set out in function venue packages clients say yes to is where to put it — and if you still need to work out what that per-head number should be, our guide to function drinks package pricing builds it up from liquid cost and bar labour.
Ordering branded ice for a function
Branded trays are made to order, so the logistics are simple but not instant. The minimum is one tray at $199.95 — no setup fee, no bulk requirement, and most function bookings order between one and four. Allow two to three weeks door to door: one to two business days for an artwork proof, two to five business days production in our Warrnambool workshop, plus domestic freight. Right now, in August, you're in the quiet winter window and orders move at the fast end of that. From late September the end-of-year function season lands and everyone orders at once — for a November or December function, have your order in by mid-October.
What you need to supply is a single-colour logo, name or date as a vector file (.ai, .eps, .svg) or a high-resolution PNG with a transparent background. Fine detail and thin strokes don't survive being frozen, so most logos get simplified slightly — that's part of the artwork proof you'll be sent before anything is moulded. Full specifications and the artwork checklist are in our custom logo ice cubes guide, and you can start from the branded ice cube tray range or browse the full catalogue.
FAQ
How much ice do I need per person for a 4-hour function?
Around 1.5 kg per guest indoors, or 2 to 2.5 kg per guest outdoors or in summer. That covers drinks ice, bottle chilling and a normal amount of melt loss. Build it properly with guests × hours × 0.3 kg for drinks, plus 20 kg per tub and 20 kg per food display.
How many 5 kg bags of ice is that?
Divide your total kilograms by five and round up to the next ten. A 150-guest wedding at roughly 375 kg is 75 bags; a 300-guest outdoor Christmas party at 800 kg is 160 bags, which is about eight-tenths of a standard insulated pallet.
What's the minimum order for a branded ice tray?
One tray, at $199.95. There's no bulk minimum and no setup fee, so a single event can order one and a venue group can order twenty. Each tray produces six 45 mm cubes per fill and can be refilled indefinitely.
How long does a custom logo ice tray take to make?
Two to three weeks door to door within Australia if you approve the proof promptly — one to two business days for the proof, two to five business days production, plus freight. For November and December functions, order by mid-October, because the queue forms from late September.
What file do I need to send for the logo?
A vector file (.ai, .eps or .svg) is ideal. A high-resolution PNG with a transparent background also works. Single colour, no gradients, and avoid strokes thinner than about 1.5 mm at final size — they won't hold their shape in ice.
Is ice really regulated as a food in Australia?
Yes. Ice falls under the Australia New Zealand Food Standards Code, and the same handling, contamination-control and cleaning requirements that apply to any other food apply to ice, ice wells, scoops and tubs.