When choosing a new unit for the kitchen, one of the first questions that arises for the buyer is the question of displacement. Many people mistakenly believe that the numbers on the price tag or in the device passport reflect the actual space available to place products. However total volume of the refrigerator and the space that can actually be used are two different quantities, and ignoring this fact can lead to unpleasant surprises during operation.
It is important to understand that manufacturers indicate parameters differently, and measurement standards can differ significantly depending on the brand and country of origin. European models are often labeled according to the EN 153 standard, which strictly regulates how exactly liters should be counted, while Asian or domestic brands may use their own methods. That is why, before purchasing, you need to clearly understand how much space you really need to store supplies.
In this article we will look in detail at what the displacement consists of, how to correctly calculate the required capacity for your family and why the “useful” indicator is more important than the “full” one. You will learn to read technical documentation and understand what numbers you should pay attention to first, so as not to overpay for excess air or, conversely, not suffer from lack of space.
The difference between full and useful volume
The first thing an attentive buyer encounters is the presence of two different numbers in the characteristics. Full Volume (or geometric) is the theoretical capacity of the inner chamber, calculated as the product of length, width and height, excluding internal projections, shelves, drawers and cooling system. This indicator is often used by marketers as it is always larger and looks more attractive to the consumer looking for maximum capacity.
In contrast, usable volume is the actual space available to accommodate products. When calculating it, the space occupied by the compressor, evaporator, plastic guides, glass or metal shelves, as well as air gaps necessary for proper circulation of cold air is subtracted. The difference between these values can be from 15% to 25% depending on the design.
⚠️ Attention: When comparing models from different brands, always focus on the usable volume. A model with a stated 350 liters of total volume may turn out to be tighter than a model with 320 liters, but with a more competent internal layout.
There is also a concept freezer volume, which is often indicated separately. In two-chamber refrigerators it is approximately 20-30% of the total usable volume. If you are used to purchasing food in bulk for a month, you should look for models where the freezer share is increased, or consider purchasing a separate chest.
Measurement standards and labeling
There is no single law in the world obliging all manufacturers to count liters the same way, but the European standard is considered the most authoritative EN 153. According to this document, the useful volume is determined by filling the chamber with special measuring containers. This allows you to obtain objective data that can be compared between different devices.
American and Asian manufacturers sometimes use a measurement method in which standard food bags or geometric shapes are placed in the chamber. This may result in a slight error. In addition, in some cases nominal volume the space under the top tier of shelves may not be taken into account if it is less than a certain height, which also affects the final figures.
In technical documentation you may find designations in liters (l) or cubic feet (cu. ft), especially in models intended for the US market. To convert cubic feet to liters, a factor of 28.3 is used. For example, a refrigerator with a volume of 20 cubic feet will have a capacity of about 566 liters.
Why may the numbers in the store and in the instructions differ?
Sometimes advertising brochures indicate the maximum theoretical volume obtained mathematically, while the technical data sheet indicates the real one, measured according to the standard. Always check the “Specifications” section on the manufacturer’s official website.
It is also important to consider that interior decoration affects usable space. Chambers with smooth walls without complex ventilation systems (in older models) hold more than modern units with a system No Frostwhere fans and additional air ducts are hidden behind the back wall, “eating up” several liters.
How to calculate the required volume for a family
The choice of refrigerator size is a balance between the available space on kitchen and the real needs of the household. There is an average formula that planners use: it is recommended to allocate about 50-70 liters of usable volume in the refrigerator compartment and 20-30 liters in the freezer per person. However, these numbers may vary depending on your eating habits.
If you prefer to cook daily and buy fresh food in small portions, the minimum values will be enough for you. In the case when it is customary for a family to make supplies for a week or a month, or if you like to freeze semi-finished products, berries and meat, the need for space increases sharply. It is also worth considering the dimensions of frequently used dishes: tall pots or baking trays require an appropriate height of the shelves.
For ease of calculation, you can use the following gradation:
- 👤 1-2 people: the optimal total volume is 200-300 liters. Compact models with a height of up to 150 cm will ideally fit into small kitchens.
- 👨👩👧👦 3-4 people: it is recommended to choose units with a volume of 300-450 liters. A full-fledged freezer and a freshness zone are already important here.
- 🏠 5 or more people: It is worth taking a closer look at models with a volume of 500 liters and above, including Side-by-Side or French refrigerators with four doors.
Don't forget about fill factor. The refrigerator operates more efficiently when it is about 70-80% full. It is more difficult to cool an empty chamber due to the larger amount of air, but an overcrowded one disrupts the circulation of cold. Therefore, always leave a small amount of free space.
The influence of the type of refrigerator on capacity
The design of the refrigerator directly dictates how much food will fit in it. Classic two-chamber models (tall and narrow) are the most common. In them, the freezer is usually located at the bottom or top. With a bottom-mounted freezer, the main refrigerator compartment is at eye level, which is ergonomic, but the freezer itself may be less spacious due to the design of the pull-out baskets.
Type models Side-by-Side (side by side) are a tall cabinet where the freezer and refrigerator compartments are located vertically next to each other. Such devices often have a larger total volume (up to 600 liters or more), but their width (usually 90 cm) requires a spacious kitchen. Narrow shelves in such models may be inconvenient for storing wide dishes or baking sheets.
French Door refrigerators combine a wide refrigerator compartment on top with hinged doors and a voluminous freezer compartment below in the form of a drawer. This solution allows you to combine wide access to products and large freezer capacity, while maintaining a standard case width of about 60 cm.
| Refrigerator type | Average volume (l) | Width (cm) | Features storage |
|---|---|---|---|
| Double-chamber (Top Freezer) | 250 - 350 | 55 - 60 | Narrow freezer, convenient main chamber |
| Two-chamber (Bottom Freezer) | 300 - 400 | 60 | Ergonomic main area, drawers below |
| Side-by-Side | 500 - 650 | 90 - 100 | Vertical zoning, narrow shelves |
| French Door | 400 - 550 | 80 - 90 | Wide refrigeration area, deep freezer |
⚠️ Attention: Before purchasing a wide model (Side-by-Side or French Door), be sure to measure the width of the doorways in your apartment. It often happens that the refrigerator simply does not fit into the kitchen or cannot be deployed in the hallway.
Internal layout and ergonomics
Even with the same capacity, two refrigerators can hold different amounts of food due to the internal layout. Shelves play a key role here. Glass shelves are stronger and can support more weight, but they take up space in the grooves. Height-adjustable shelves allow you to place large items, but the adjustment mechanism can “eat up” a couple of centimeters on the sides.
Door shelves are a convenient place to store bottles, sauces and eggs, but they are not suitable for heavy products. Depth of door pockets varies: in some models they are so deep that they allow you to place two-liter bottles in two row, which significantly increases the payload. In budget models, door shelves are often narrow and not adjustable.
The drawers at the bottom of the refrigerator compartment deserve special attention. In models with a Multi Flow or Air Fresh system, the drawers can be closed, which creates a high humidity zone for vegetables. Open baskets are easier to access, but do not retain the freshness of greens as well. It is also worth paying attention to the presence of a folding shelf, which allows you to place tall bottles or pots in the chamber.
☑️ What to look at inside the refrigerator
Ergonomics also depends on the backlight. High-quality LED lightinglocated around the perimeter or on the end wall allows you to see products deep in the chamber, effectively using the entire available volume. A dim light bulb in the corner makes you forget about the products in the back, actually reducing the useful use of space.
Energy efficiency and fullness
There is a common myth that an empty refrigerator uses more energy than a full one. In fact, the air heats up faster than the food, so when the doors are opened frequently in an empty chamber, the temperature rises more sharply. However overloaded refrigerator this is also bad. If the products lie close to the back wall or block the air supply channels, the compressor will work hard, trying to cool the entire volume evenly.
The optimal load is about 70%. In this case, the products act as cold accumulators (especially if they contain a lot of water), helping the temperature during a short power outage or opening a door. If you store a small amount of food, you can place bottles of water in the free spaces to stabilize the temperature.
Modern inverter compressors are less sensitive to the degree of load, since they smoothly regulate power rather than working jerkily on and off. However, correct distribution of products on shelves according to temperature zones remains important for food preservation and energy saving.
Frequently asked questions (FAQ)
Why is the actual volume less? declared in the advertisement?
Advertising often uses the full geometric volume, which is calculated based on the external or internal dimensions of the empty chamber. The actual (useful) volume is less due to the thickness of the insulation, the presence of shelves, drawers, a compressor and an air circulation system that occupy the internal space.
What is the optimal volume of a refrigerator for a family of 3 people?
For a family of three people, shopping once a week, the optimal useful volume of the refrigerator compartment is about 200-250 liters and freezer - 60-80 liters. The total volume of such a device will be approximately 300-350 liters.
Does the thickness of the refrigerator walls affect the volume?
Yes, directly. The thicker the layer of thermal insulation, the better the refrigerator keeps the cold and the quieter it operates, but the smaller the useful internal space with the same external dimensions. Modern models with vacuum panels make it possible to make the walls thinner, maintaining thermal insulation and increasing the internal volume.
Is it possible to increase the usable volume by removing the shelves?
Technically it is possible, but not recommended. Shelves divide the space into zones with different temperatures. In addition, without shelves, air circulation is disrupted, which can lead to food spoilage. It is worth removing the shelves only temporarily if you need to place a very tall item.
What is the freshness zone and how much space does it take up?
The freshness zone (zero chamber) is a separate compartment with a temperature of about 0°C and high humidity, designed for storing meat, fish and vegetables. It takes up from 10 to 30 liters of usable volume, depending on the model, and is usually located in the lower part of the refrigerator compartment.