Sizing an Ice Machine for Casual and Family Dining

Ice machine sizing often starts with a simplified chart or calculation. Choose the restaurant type, multiply seating capacity by a pounds-per-guest estimate, and move to the nearest machine size. It's quick, simple, and sometimes it gets us close, but it can often miss how a restaurant actually uses ice. Experience has shown us that this is exactly how a location can either end up short during a busy rush, or with far more equipment than it really needs.

We're going to slow the process down and size and walk through it one step at a time. Different businesses use ice at a much different rate, and establishments like quick-service restaurants, bars, hotels, and healthcare facilities all have different demand patterns that need to be considered when selecting the right ice equipment. In this guide, we'll cover casual/family dining restaurants.

Three Questions We Need to Answer

At a high level, restaurant ice machine sizing comes down to three practical questions:

1. How much ice will guests use on the busiest day?
2. How much ice will the machine make while the restaurant is serving guests?
3. Can the machine and bin remake enough ice to be ready for the next day?

Let's walk through the steps using a make-believe 225-seat restaurant called Travis's Teriyaki as our example. It's a new build, so there's no sales history or existing machine to use as a reference.

Build the Restaurant Profile

Every restaurant segment has its own variables. A quick-service restaurant may need to account for drive-through demand, while a bar may use more ice in cocktails than in soft drinks. For Travis's Teriyaki, we'll use the following planning assumptions:

One detail deserves extra attention: every guest receives iced water. That can double table-side ice demand before we count a single refill, so it's the kind of operating detail a simple seats-times-pounds chart can easily miss.

Part 1: Calculate the Restaurant's Ice Demand

Step 1: Estimate the Ice in Each Drink

Before we get into seating and table turns, we need to estimate how much ice goes into each drink.

When sizing cubed-ice beverage demand, estimate that a glass filled with ice contains will contain half of its stated liquid volume in ice. In other words, if you fill a 16-oz. cup to the top with ice, that ice would melt down to approximately 8 oz. We'll use that assumption to calculate approximate pounds of ice per glass. This isn't always exact, but it's a practical rule of thumb for planning ice needs.

Estimated ice per glass (lbs.) = Glass size in ounces × 0.5 ÷ 16

Example: 16 oz. × 0.5 ÷ 16 = 0.5 lbs. of ice per glass.

Again, the exact amount will vary from drink to drink, but this gives us a dependable starting point.

Step 2: Estimate Busiest-Day Guest Visits

Travis's Teriyaki has 225 seats and is planning for two lunch turns and three dinner turns at each table, or five total table turns on the busiest day.

Busiest-day guest visits = Seats × Total table turns

Example: 225 seats × 5 turns = 1,125 guest visits.

Step 3: Estimate Ice Per Guest

Each 16-ounce glass uses about 0.5 lbs. of ice under our assumption. It's common for restaurants like these to serve ice water in addition to the soft drinks customers order, so we'll assume every guest gets one ice water plus one additional soda, tea, or lemonade.

Ice per guest = Ice per drink × Number of iced drinks per guest

Example: 0.5 lbs. × 2 drinks = 1 lb. of ice per guest.

Step 4: Calculate Peak Ice Demand

Peak ice demand = Guest visits × Ice per guest

Example: 1,125 guest visits × 1 lb. per guest = 1,125 lbs. of ice.

Will every guest actually order a second iced drink? Probably not. Not every glass will be packed perfectly with ice either. The goal is to build a reasonable high-side estimate for the busiest day, which also gives us room for refills, scooping waste, normal bin melt, wait-station fountain loss from melting, and other small uses we haven't calculated separately.

Part 2: Size the Ice Machine and Storage Bin

Knowing the daily demand is only half the job. Travis's Teriyaki doesn't need all 1,125 pounds sitting in the bin when the doors open because the machine keeps making ice during service. Now we need to see how production, storage, and overnight recovery work together. We'll walk through the steps, and then we'll apply them using our Travis's Teriyaki example.

Step 5: Choose a Realistic Production Number

Commercial ice machines produce less ice as surrounding air and incoming water get warmer. Manufacturer production tables commonly show ice production ratings at both 70°F air / 50°F water conditions and at warmer 90°F air / 70°F water conditions to help users predict their ice supply based on their business's environment and temperature conditions.

Use a practical production figure based on your installation environment instead of automatically sizing from the best-case 70°F/50°F rating. In this example of Travis's Teriyaki, we'll use a reasonable figure between the two published ratings of a 78°F air temperature and 58°F water temperature because the kitchen is expected to run warmer during summer.

Step 6: Calculate Production During Service

Hourly production = Adjusted 24-hour production (determined in step 5) ÷ 24

Production during service = Hourly production × Hours open

Step 7: Calculate the Ice That Must Be Waiting at Opening

Starting usable storage = Peak demand − Production during service

This tells us how much usable ice needs to be in the bin when the restaurant opens. The machine can produce the rest while guests are being served.

Step 8: Convert Rated Bin Capacity to Usable Storage

Use about 80% of the bin's published capacity as usable storage. Ice piles into a mound rather than filling every inch evenly, so a 1,000-lb. rated bin doesn't normally actually provide 1,000 lb. of practical usable ice. 80% isn't always exact, but in our experience, this is a good estimate.

Usable storage ≈ Rated bin capacity × 0.80

Example: 1,000 lb. × 0.80 = about 800 lb. of usable storage.

Step 9: Check Overnight Recovery

Finally, make sure the machine can rebuild the required starting supply before the restaurant opens again. A bin can carry a restaurant through a rush, but if the machine can't replace what the restaurant uses, more storage only delays the shortage.

Overnight production = Hourly production × Hours closed

Travis's Teriyaki is open 12 hours and closed 12 hours, so the machine has half the day to produce during service and the other half to rebuild the opening supply.

Testing the Hoshizaki KM-901MAH

Let's put these steps into action and test them with a Hoshizaki KM-901MAH. Its published production table lists 920 lb. per day at 70°F air / 50°F water and 813 lb. per day at 90°F air / 70°F water. Because our example assumes a warmer kitchen in summer (around 78°F air / 58°F water), we'll use 875 lb. per day as the practical planning figure.

• Hourly production: 875 ÷ 24 ≈ 36.5 lbs./hour.
• Production during 12 open hours: 36.5 × 12 ≈ 438 lbs.
• Starting usable storage needed: 1,125 − 438 ≈ 687 lbs.
• Usable storage in a 1,000-lb. rated bin: about 800 lbs.
• Overnight production during 12 closed hours: about 438 lbs.
• Ice needed at the next opening: about 687 lbs.
• Overnight recovery deficit: about 249 lbs. We'll round up to 250 lbs.

Result: The KM-901MAH and 1,000-lb. bin can make it through one modeled 1,125-lb. peak day, but the machine can't rebuild the required opening inventory overnight. The storage works, but production is the limiting factor.

Testing the Hoshizaki KM-1301SAH

Let's move up to a Hoshizaki KM-1301SAH instead. Its published production table lists 1,329 lb. per day at 70°F air / 50°F water and 1,164 lb. per day at 90°F air / 70°F water. For the same warmer-kitchen scenario, we'll use 1,250 lb. per day as the practical planning figure.

• Hourly production: 1,250 ÷ 24 ≈ 52 lb./hour.
• Production during 12 open hours: about 625 lbs.
• Starting usable storage needed: 1,125 − 625 = 500 lbs.
• Usable storage in a 1,000-lb. rated bin: about 800 lb. Comfortably above the 500 lb. needed.
• Overnight production during 12 closed hours: about 625 lbs.
• Ice needed at the next opening: 500 lbs.
• Overnight recovery margin: about 125 lbs.

Result: The KM-1301SAH and the same 1,000-lb. bin can cover the modeled 1,125-lb. peak demand and rebuild enough ice overnight to be ready for the next one, with about 125 lb. of production margin.

So What Size Would We Choose?

For this 225-seat casual restaurant, the 1,000-lb. bin still makes sense. The deciding factor is production:

• KM-901MAH + 1,000-lb. bin: enough usable storage to get through the modeled peak day, but not enough production to recover for another 1,125-lb. day.
• KM-1301SAH + 1,000-lb. bin: enough production and storage to cover the peak day and rebuild the required opening inventory overnight.

That distinction is the heart of restaurant ice sizing. Storage carries the operation through busy meal periods, while production replaces what's used during service and after closing. A large bin can't permanently compensate for a machine that produces less ice than the restaurant repeatedly consumes.

Summarizing the Ice Machine Sizing Process

Here's a summary of the series of steps that create the full sizing method. The first four steps estimate demand, and the last five test whether a given ice machine and storage bin setup can support it.

1. Estimate ice per glass: Glass size in ounces × 0.5 ÷ 16 oz = estimated pounds of ice per glass.
2. Estimate busiest-day guest visits: Guest capacity × total table turns = busiest-day guest visits.
3. Estimate ice per guest: Pounds of ice per glass × number of iced drinks per guest = estimated pounds of ice per guest.
4. Calculate peak daily ice demand: Busiest day guest visits × pounds of ice per guest = peak ice demand.
5. Choose a realistic production estimate: Use manufacturer production ratings and expected air/water conditions to choose a practical 24-hour planning figure.
6. Calculate production during service: 24-hour production rating ÷ 24 hrs. × hours open = ice produced during service.
7. Calculate storage needed: Peak ice demand − production during open hours = minimum usable ice needed at opening.
8. Convert rated bin capacity to usable storage: Rated bin capacity × 0.80 ≈ usable storage.
9. Check overnight recovery: Adjusted 24-hour production ÷ 24 × hours closed = overnight production. This must rebuild the required storage needed per day.

The Factors That Ultimately Determine Ice Machine Size

These are the factors we need to consider together when sizing an ice machine and storage bin for casual or family dining. Busiest-day guest volume, ice used per guest, production during service, usable storage, real-world operating temperatures, and the machine's ability to recover before the next day.

Daily ice demand tells us what the restaurant uses, storage tells us how much of that demand can be carried through the rush, and production tells us whether the system can keep replacing ice fast enough to make that demand sustainable day after day.

A new restaurant will always involve some educated guesswork. Some locations stay packed long after opening, while others settle to 60% to 80% of their opening traffic. The goal isn't to predict every glass perfectly, it's to make the best equipment choice using the information available with a margin for unexpected ice needs and future growth.

Need Help Calculating Ice Demand for Your Restaurant?

At Easy Ice, our experts can work through these same factors with casual and family dining operators to estimate real-world ice demand and determine the right balance of production and storage. We can account for seating, table turns, drink service, operating hours, kitchen conditions, expected peak periods, and other ice uses so you don't have to rely on a generic sizing chart alone.

Our fully managed ice machine subscription also gives businesses flexibility if actual demand changes after opening. We still want to make the most educated choice possible, and practical sizing math like this gets us much closer to the right equipment than a chart and a guess.