Commercial Ice Machine Size Calculator

The nameplate is a 24-hour number. Your well empties in a rush. Put covers or bar seats in and you get a starting lb/day, a class (undercounter or modular) and a bin range. That is enough to stop guessing. It is not a load calculation.

The lb/day you see already includes the 20% buffer and the hot-kitchen derate when those controls are on (buffer default on, derate default 20%). Turn them off only if you are applying those by hand.

How the number is built

A full-service restaurant should plan on 1.5–2 lb of ice per cover. Water glasses, soda, iced tea, kitchen prep, and a modest bar program live in that range. Lean 1.5 if the room is water-and-soda. Lean 2 if every table is drinking ice and the kitchen is dumping the well. A bar is closer to 3 lb per seat. Almost every ticket is a glass of ice.

Those are average-night numbers. Add a 20% buffer. Friday is not Tuesday. A patio opens, a private dining room books, or the condenser is already dirty and the unit is not hitting the rating. Buffer is how you still have ice when the night is heavier than the number you typed in.

Then take 10–30% off if the machine will live in a hot kitchen. Air-cooled units dump heat into the room that is already trying to kill production. The rating on the cabinet assumes air and water a tight cook line in August does not have. Ten percent is a warm but ventilated space. Thirty percent is a closet next to the fryer with no clearance. Skip the derate and you buy a machine that looks right on paper and starves the well during service.

Size the bin at 40–60% of daily production. The head makes ice around the clock. You use most of it in a few hours. The bin is the battery. Too small and you run out during the rush even when the 24-hour number looked fine. Too large and you are sitting on yesterday’s ice.

The bin is not the machine

Operators size the head and forget the bin. That is how you get a unit that “makes enough” and a well that is empty at the second turn.

A modular head does not store ice. Production and storage are two different numbers. You size them separately. If the bin cannot hold the overnight harvest, extra production does not help you at 6 p.m. Ice made at 3 a.m. is what you pour during the rush.

An undercounter has the bin in the cabinet. That is why it drops under a bar, and why the built-in bin is the limit when you need a lot of ice at once. A modular head sits on a separate bin you pick on purpose. Head and bin are a pair. Buy one without the other and you have half a machine.

Undercounter or modular

Undercounter is the right class for a smaller bar, a low-volume restaurant, or a station that only has to keep one well. Self-contained, built-in bin, one footprint. You still need potable water, a drain, and the right electrical. You do not need a separate bin on the floor.

Modular is the right class when you need a lot of ice at once: a busy dining room, a bar that dumps the well every hour, a kitchen that packs and plates on ice. The head makes it. The bin holds it. Install is a different job than sliding an undercounter under the bar: dedicated circuit, drain in the right place, clearance for an air-cooled condenser, and a bin that matches the dump.

The calculator points you at a class. A site survey confirms it. A bar that looks undercounter on seats can still need a modular if the program is all-ice cocktails and the well never sits. Do not fight the class to save a few inches of floor.

Comparing heads after you know the class: Hoshizaki vs. Manitowoc is a service conversation. Hoshizaki, Manitowoc, Scotsman, and Ice-O-Matic are what techs actually see. If the cocktail program wants a dense, slow-melt cube, Kold-Draft is the name bartenders already use.

Cube, nugget, or flake

Ice type is a different machine, not a setting.

Cube is the default for restaurants and most bars. Full cubes and half cubes cool a drink without vanishing. Half cubes fill a cup faster and show up on soda guns; full cubes look better in a rocks glass.

Nugget (the chewable ice) is what a lot of QSR and healthcare want in the cup. It packs, it soaks up soda, and people chew it. If the concept is built on that ice, size a nugget unit. Do not plan to crush cubes as a workaround. Follett shows up in some healthcare and self-serve dispenser specs; most restaurants do not need that conversation.

Flake ice is for seafood cases, produce displays, and packing. It is not bar ice. If you need flake and cube, that is two jobs.

A countertop residential unit will not keep a bar in ice.

This is not a load calc

The calculator does not know your floor drain, incoming water temperature, clearance behind the condenser, or whether the unit will sit on a cook line that never cools off. It does not know Saturday catering bags or a seasonal patio. A dealer or a refrigeration tech walking the site still wins.

Use the number to stop under-buying, and to stop ordering a modular you cannot place. Then put the location in front of someone who can see the water, the drain, and the heat. If covers are still a guess (new concept, unproven bar program, short option on the space), that is a lease vs. buy question as much as a sizing question. Uncertain volume is a reason to lease. Stable covers and a 7+ year stay is usually a reason to buy.

The full ticket (head, bin, filter, install, circuit) is on commercial ice machine cost. Do not treat the calculator’s lb/day as a catalog price.

Get a local quote, or shop the catalogs

Lease, install, water, drain, and the service call are local jobs. A dealer who will put a tech in your kitchen is the person to quote a rental, a lease, or a turnkey install. Use the dealer quote form and send the basics: covers or bar seats, ice type, undercounter or head-and-bin, and photos of the water, drain, and electrical at the proposed spot. Lease, rental, buy, or not sure: the form already asks. You will get a better number than a website can give you, because the website cannot see your floor drain.

If you are buying the equipment yourself and handling install with your plumber and electrician, shop current commercial ice machines by category, not by a random model number:

• KaTom commercial ice machines
• WebstaurantStore commercial ice machines

Those catalogs are the buy path. They will not quote a lease, they will not pull a circuit, and they will not show up when the machine is down on Saturday. For that, talk to a dealer.