How to Size Commercial Refrigeration for Your Kitchen: A Practical Guide

Undersized refrigeration is one of the most expensive mistakes a commercial kitchen can make — not because of the cost of the equipment itself, but because of what happens when it fails to cope. Overloaded fridges run warm. Warm fridges fail food safety checks. Failed food safety checks mean EHO intervention, potential closure, and reputational damage that outlasts any equipment problem.

Oversizing has its own costs: wasted capital, wasted energy, and cabinets that are half-empty because the operation doesn't justify them.

This guide walks you through a methodical process for calculating the right refrigeration capacity for your specific kitchen. It uses worked examples throughout so you can apply the same logic to your own numbers.

Step 1: Map Your Menu and Ingredient Categories

Before you think about litres or dimensions, you need to understand what you're actually storing. Work through your current menu and categorise every chilled ingredient by type:

• Raw meat and poultry — must be stored at the bottom of the fridge, separately from other items
• Raw fish and seafood — ideally in a dedicated section or unit
• Dairy (milk, cream, butter, cheese)
• Ready-to-eat foods — cooked meats, salads, prepared desserts, anything that won't be cooked before service
• Raw fruit and vegetables
• Sauces, stocks, and prepared components
• Frozen products — these need separate calculation for freezer capacity

This categorisation matters for two reasons. First, it tells you whether you need segregated storage (separate units or clearly partitioned areas for raw and ready-to-eat foods). Second, it gives you a starting picture of the volume and variety of stock you need to hold at any one time.

Step 2: Calculate Your Daily Stock Volume

The practical way to calculate stock volume is to work backwards from your covers and recipe card requirements.

Method

1. Take your average covers per service, multiplied by your busiest number of services per day
2. For each dish on your menu, note the total volume of chilled ingredients required per portion
3. Multiply portion ingredients by expected sales mix to get a daily total per ingredient
4. Add 20% for wastage, over-ordering, and staff meals

Worked Example A: 60-Cover Café

A 60-cover café operates two sittings per day and runs a menu of eight main dishes plus a cake and dessert counter. Their chef estimates the following daily chilled stock:

• Dairy (milk, cream, butter, cheese): approximately 25 litres
• Prepared salads and garnishes: approximately 15 litres
• Sandwich fillings and cold cuts: approximately 20 litres
• Cakes and desserts: approximately 30 litres
• Sauces and dressings: approximately 10 litres
• Raw ingredients (eggs, vegetables): approximately 20 litres

Daily stock total: approximately 120 litres
Add 20% headroom: 144 litres
Delivery frequency: Five days per week (so maximum one day's stock held)
Recommended fridge capacity: 200 litres minimum (allowing further headroom for peak periods)

This café could manage with two well-placed under-counter fridges and a display fridge for cakes — no upright required. If they ever move to three-day delivery cycles, the calculation changes entirely.

Worked Example B: 120-Cover Restaurant

A 120-cover restaurant runs lunch and dinner service, receives deliveries on Monday, Wednesday, and Friday. Maximum stock holding period: two days.

• Raw meat and poultry: approximately 40 litres per day × 2 days = 80 litres
• Raw fish: approximately 15 litres per day × 2 days = 30 litres
• Dairy and cheese: approximately 20 litres per day × 2 days = 40 litres
• Prepared components and sauces: approximately 30 litres per day × 2 days = 60 litres
• Vegetables and salad: approximately 25 litres per day × 2 days = 50 litres
• Ready-to-eat items: approximately 20 litres per day × 2 days = 40 litres

Total calculated stock volume: 300 litres
Add 20% headroom: 360 litres
Recommended fridge capacity: 400–500 litres minimum

This restaurant needs at least one large upright fridge (or two medium units) plus prep and line refrigeration. A 600-litre double-door upright, combined with two under-counter units on the line, would be a practical configuration.

Step 3: Account for Your Kitchen Layout

Capacity in litres tells you how much refrigeration you need. Your kitchen layout tells you what form it should take.

Consider where stock is used

Refrigeration placed at the point of use reduces the number of times staff cross the kitchen during service. Every unnecessary journey adds time and increases the risk of cross-contamination. Map out your main prep and cooking zones, then think about where chilled storage should sit in relation to each.

• At the grill or range: An under-counter fridge keeps meat and fish close to the cook without requiring a trip to a walk-in.
• At the salad station: A prep fridge (saladette) with a top rail keeps garnishes and cold components in arm's reach.
• At the pass: A small undercounter unit for sauces, garnishes, and items plated cold.
• In the dry store or delivery area: A full-height upright or cold room for bulk storage following deliveries.

Measure your available space accurately

Commercial fridges have external dimensions that are frequently larger than their stated capacity suggests. Before ordering, measure:

• Width of the available space (plus clearance on each side for ventilation — typically 50–100mm)
• Depth — particularly important if the unit will sit under a worktop or against a wall
• Height — account for ceiling-mounted extraction hoods and overhead shelving
• Door swing — ensure doors can open fully without hitting an adjacent unit or wall

Step 4: Factor in Staff Count and Service Tempo

A kitchen with three chefs opening fridges at different times needs units with faster temperature recovery than a kitchen where one chef works alone. Every time a door opens, the internal temperature rises. In a high-volume kitchen, frequent door opening can be the primary cause of temperature compliance failures.

Rules of thumb

• 1–2 chefs: Standard door-sealing and fan-assisted cooling is sufficient
• 3–5 chefs: Consider double-door units to reduce how far the temperature drops with each opening; ensure the unit is rated for high-ambient environments if near cooking equipment
• 5+ chefs or very high service tempo: Under-counter units at each station reduce reliance on a single main fridge and distribute the door-opening impact across multiple smaller units

Step 5: Plan Your Freezer Capacity Separately

Freezer capacity is calculated differently because the relationship between covers and frozen stock varies far more than with chilled storage. Some kitchens use almost no frozen product; others are heavily reliant on it.

Key factors for freezer sizing

• Ice cream and desserts: High volume relative to kitchen size; dessert-focused menus need disproportionately large freezer capacity
• Protein sourcing: Kitchens buying whole carcasses or large bulk cuts for butchery need significant freezer space for staged defrosting
• Ready-to-cook components: Kitchens using par-cooked or pre-prepared frozen elements need reliable, well-organised freezer storage with clear stock rotation
• Blast chilling: If you operate cook-freeze, your freezer must be able to accept blast-chilled product at volume — size accordingly

Worked Example C: Takeaway with High Frozen Volume

A busy takeaway serving 150 covers per evening relies heavily on frozen product — frozen chips, frozen protein portions, frozen desserts — and receives one large delivery per week.

• Frozen chips (bulk bags): 60 litres per week
• Frozen protein portions: 80 litres per week
• Ice cream and frozen desserts: 30 litres per week
• Other frozen product: 20 litres per week

Total weekly frozen stock: 190 litres
Add 20% headroom: 228 litres
Recommended freezer capacity: 250–300 litres minimum

A 300-litre upright freezer or a combination of a chest freezer and an upright would meet this requirement.

Step 6: Build in Growth and Seasonal Variation

Never size refrigeration purely for today's operation. Consider:

• Seasonal peaks: A 40% uplift in covers at Christmas or during summer outdoor service requires proportionally more cold storage. If you can't add temporary units easily, build the peak requirement into your permanent installation.
• Menu expansion: If you plan to extend your menu in the next 12–24 months, factor that in now. Installing additional refrigeration later is more expensive than buying the right capacity upfront.
• Delivery frequency changes: If you're currently on daily deliveries and your supplier changes to three-times-a-week, your cold storage requirements could double overnight.

Quick Reference: Sizing by Kitchen Type

• Small café (up to 40 covers): 2 × under-counter fridges + 1 × display fridge. 200–300 litres total chilled capacity.
• Restaurant (40–80 covers): 1 × upright fridge (600 litre) + 2 × under-counter units. 800–1,000 litres total.
• Busy restaurant (80–150 covers): 1–2 × upright fridges (600–1,200 litre) + prep fridge on the line + under-counter units. 1,200–1,800 litres total.
• High-volume or multiple sittings (150+ covers): Cold room for bulk storage + upright units on the line + prep fridges at stations.

Get It Right First Time

Sizing commercial refrigeration accurately takes about an hour of methodical work before you buy — and saves weeks of operational headaches afterwards. Use the steps above, be honest about your delivery frequency and seasonal peaks, and always build in that 20% headroom.

At Caterzone, we help kitchens across the UK spec the right refrigeration for their operation. Browse our commercial refrigeration range, including upright fridges, under-counter fridges, and cold rooms. Or contact our team at info@thecaterzone.co.uk — we're straightforward to deal with and know the equipment well.