How to Tell What Size Refrigerator You Have (Cubic Feet Guide)

Knowing your refrigerator's cubic footage comes up more often than you might expect -- when shopping for a replacement, figuring out whether a new fridge will fit in the same space, or simply trying to understand whether your current appliance is appropriately sized for your household. The good news is that finding this information takes less than two minutes once you know where to look. There are three reliable methods, and the most accurate one -- checking the model number label -- happens to be the same step that identifies your refrigerator's water filter.

Why Cubic Footage Matters

Refrigerator capacity is expressed in cubic feet of interior storage space. It determines how much food the fridge can hold and is one of the primary specifications used when replacing a unit, comparing models, or troubleshooting whether an appliance fits the available kitchen space. Most modern refrigerators range from about 18 cubic feet for a basic top-freezer model to 33 cubic feet or more for a full-size French door with a bottom freezer.

As a general guideline, household size maps to capacity as follows:

These are starting points, not strict rules. Households that cook frequently, buy in bulk, or have children typically need more capacity than the guideline suggests.

Method 1 -- Find the Model Number Label (Most Reliable)

The model number label is the fastest and most accurate source of refrigerator size information. Most manufacturers encode capacity in the model number itself or list specifications directly on the label. Even when the capacity is not printed on the label, the model number gives you everything you need to look up the exact specifications online.

The label is almost always located in one of the following places, depending on the brand and age of the appliance.

Open the fresh food compartment first -- this is where the label sits on the majority of current refrigerators. Look for a sticker with the model number (labeled MODEL), serial number (labeled SERIAL or SER), and often the manufacture date. On some brands the cubic footage is printed directly on the label alongside the model designation. On others it is embedded in the model number itself.

Samsung and LG refrigerators frequently encode capacity in the model number -- a Samsung RF23M8570SG signals a 23 cubic foot capacity, and an LG LRMVS3006S signals a 30-inch-wide French door class. Whirlpool and Maytag model numbers typically do not encode capacity as directly, but a quick online search of the full model number pulls up the complete specification sheet within seconds.

Once you have the model number, enter it into any major appliance retailer's search bar or the manufacturer's own website to confirm the exact cubic footage listed in the original product specifications.

Method 2 -- Measure the Interior Manually

If the label is missing, unreadable, or you simply want to verify the specs independently, you can calculate approximate cubic footage by measuring the interior dimensions of the fridge.

Measure the interior width, interior depth (front to back, at the shelf level), and interior height in inches. Multiply the three numbers together, then divide by 1,728 (the number of cubic inches in one cubic foot).

The formula: (interior width x interior depth x interior height) ÷ 1,728 = cubic feet

For example: 29 inches wide x 28 inches deep x 42 inches tall = 34,104 cubic inches ÷ 1,728 = approximately 19.7 cubic feet.

Keep in mind that the number you calculate will be slightly higher than the manufacturer's rated capacity. Manufacturers measure the usable storage space -- accounting for shelves, door bins, and the thickness of interior walls -- which reduces the actual usable volume by roughly 10 to 15% compared to a raw interior measurement. Your calculated number is therefore a close approximation, not an exact match to the spec sheet.

Measure the refrigerator compartment and freezer compartment separately if you want a breakdown of each, then add them together for total capacity.

Method 3 -- Check the Owner's Manual or Manufacturer's Website

The owner's manual that came with the refrigerator lists capacity in its product specifications section, typically on the first or second page of the technical data. If the physical manual is lost, most manufacturers post digital manuals on their websites -- search the brand name along with the model number and "owner's manual" or "spec sheet" to find the PDF.

Manufacturer spec pages list total capacity, fresh food compartment capacity, freezer capacity, exterior dimensions, and energy consumption -- all useful if you are comparing the current unit to a replacement.

Typical Refrigerator Sizes by Style

If you know your refrigerator's configuration but cannot locate the model number, the table below gives the typical cubic footage range for each style to help you estimate.

Counter-depth refrigerators are shallower than standard models -- typically 24 to 26 inches deep rather than 29 to 31 inches -- which is why they have lower capacity than a same-width standard depth unit.

The Model Number Also Tells You Which Filter You Need

The same label that identifies your refrigerator's cubic footage is the fastest way to identify the correct replacement water filter. The refrigerator model number can be entered directly into the DFS Fridge Filter Finder or the search bar at DiscountFilterStore.com to pull up compatible filter options immediately. Alternatively, removing the existing filter cartridge and reading the part number printed on it is equally reliable -- both methods are covered in the fridge filter buying guide.

For households that have not changed their refrigerator filter recently, the model number lookup is a practical two-for-one: confirm the fridge's cubic footage and order the correct filter in the same session. The full refrigerator filters collection at DFS covers compatible replacements for every major brand across OEM and certified aftermarket options.

Questions about which filter fits your refrigerator? Call the DFS team at 1-800-277-3458.

Frequently Asked Questions

How do I find out the cubic footage of my refrigerator? The most reliable method is to locate the model number label inside the fresh food compartment -- usually on the upper side wall or face frame -- and search the full model number online to pull up the manufacturer's specification sheet. The spec sheet lists exact cubic footage. Alternatively, measure the interior width, depth, and height in inches, multiply the three numbers together, and divide by 1,728 to calculate an approximate cubic footage.

Where is the model number label on a refrigerator? On most current refrigerators, the label is inside the fresh food compartment on the upper side wall or face frame near the door gasket. It may also be behind the crisper drawer, on the lower kickplate, or on the back of the unit on older models. The label shows the model number, serial number, and sometimes the manufacture date.

Does the model number tell you the cubic feet? On some brands, yes. Samsung and LG frequently encode capacity in the model number -- a number like "23" or "29" in the model string often corresponds to cubic footage or width class. Whirlpool, Maytag, GE, and Frigidaire model numbers do not encode capacity as consistently, so looking up the full model number on the manufacturer's website is the most reliable approach.

Can I calculate refrigerator size by measuring it myself? Yes. Measure the interior width, depth, and height in inches, then use the formula: (width x depth x height) ÷ 1,728. The result is an approximate cubic footage. Your calculated number will be slightly higher than the manufacturer's rated capacity because manufacturers measure usable storage space rather than raw interior dimensions.

What is the most common refrigerator size for a family of four? Most households of three to four people are well served by a refrigerator in the 22 to 25 cubic foot range. French door and side-by-side models in this capacity are the most common configurations for family-sized kitchens. Households that buy in bulk or cook frequently may want to size up to the 25 to 28 cubic foot range.

What is the difference between total capacity and usable capacity? Total capacity is the raw interior volume of the refrigerator measured from wall to wall. Usable capacity accounts for the space taken up by shelves, door bins, interior walls, and the freezer divider -- it is the space you can actually use for food storage. Manufacturers list usable capacity in their specifications, which is why your manual measurement will be slightly higher than the spec sheet number.

Does refrigerator size affect which water filter I need? No -- the water filter is determined by the refrigerator's brand and model, not its cubic footage. Two refrigerators of the same size from the same brand can use different filters if they are different model series. The refrigerator model number is the correct starting point for finding the right filter, not the capacity.

How do I find my refrigerator's water filter using the model number? Enter the model number from the label inside your refrigerator into the DFS Fridge Filter Finder or the DiscountFilterStore.com search bar to see compatible replacement options. Alternatively, remove the existing filter cartridge and read the part number printed directly on it -- this is the most direct method.