Running out of ice at 8 pm on a Saturday is not a supply chain problem. It is a calculation problem, and it is one of the most common and expensive mistakes in Australian hospitality.
Most business owners pick a machine based on a round number — “100 kg/day sounds fine” — without checking whether that number actually covers their peak hours, kitchen temperature, or storage setup. This guide gives you the numbers to size correctly before you buy or hire.
The Baseline Calculation
A bar or restaurant serving primarily beverages uses approximately 0.5 kg of ice per person per hour. A venue seating 80 people for a four-hour dinner service needs roughly 160 kg of ice for that service alone. Add prep, food display, and spillage, and 200 kg is a realistic daily figure.
The calculation shifts depending on what you are using ice for:
- Beverage service: 0.5 kg per person per hour
- Seafood and food display: 4 to 6 kg per kilogram of product on display
- Blended drinks and cocktails: 20 to 30% more than a standard bar
- Healthcare and cold therapy: approximately 150 g per patient per day for ice chips
These are starting points. Your actual number depends on service hours, cover count, and menu type.
Why the Number on the Spec Sheet is Not the Number You Will Get
Machine capacity ratings are tested at 21°C ambient temperature and 15°C incoming water temperature — the conditions of a controlled lab, not a commercial kitchen running at 35°C in January.
In a hot kitchen, an air-cooled machine rated at 150 kg/day may produce closer to 110 to 120 kg. The Australian Government’s Energy Rating standards for commercial ice makers, which came into effect in March 2026 under the GEMS Commercial Ice-makers Determination 2025, now require manufacturers to test and register machines against standardised conditions. This makes capacity comparisons between models more reliable than they were previously, but real-world output in a hot room will still fall short of the lab figure.
As a rule, size for 20% above your calculated peak demand, not your average demand.
Storage Matters as Much as Production
A machine that produces 200 kg/day is useless if the storage bin holds 30 kg. Bin size should match your peak hour demand, not your daily total. If your busiest hour needs 25 kg of ice, your bin should hold at least 30 to 40 kg to account for melt and access time.
Most modular commercial machines allow you to pair the ice-making head with a separately sized bin. Self-contained undercounter units have fixed storage, which is a genuine constraint for high-volume operations.
A Quick Guide by Business Type
- Small café, office, or juice bar: 20 to 50 kg/day — undercounter self-contained unit
- Restaurant or hotel bar (up to 100 covers): 80 to 150 kg/day — modular unit with medium bin
- High-volume bar or event venue: 200 to 400 kg/day — modular high-capacity unit or multiple machines
- Seafood retailer or food processor: depends on display size — flake ice machines typically used
- Mining camp or remote worksite: 150 to 400 kg/day — depending on crew size and temperature
Online Ice Machines supplies commercial ice machines across all these categories, with machine hire available for businesses that want to test the right capacity before committing to a purchase.
FAQs
Can I use multiple smaller machines instead of one large one?
Yes, and many businesses do. Two machines running in parallel also provide a backup if one goes down during service. The tradeoff is double the maintenance and filter costs.
What happens if I consistently run my machine at full capacity?
Running at 100% output continuously shortens component life. Budget for a machine rated at 20 to 30% above your peak demand so it runs at 70 to 80% capacity during peak periods.
Does ambient temperature really make that much difference?
A 10°C rise in ambient temperature can reduce output by 10 to 15% on most air-cooled units. In an outdoor or poorly ventilated kitchen, this adds up quickly over a summer season.
How do I account for ice melt in my calculation?
Poorly insulated bins lose 10 to 20% of stored ice per hour in a hot kitchen. If your bin is next to a hot pass or in direct sunlight, factor this into your storage sizing.