Mattress Sizes Names: Every Name and What It Means in Canada

8 min read

Why Mattress Size Names Can Be So Confusing

Walk into any mattress store and you will hear a mix of terms tossed around: Single, Twin, Double, Full, Queen, King, Eastern King, Western King, California King. It can feel like everyone is speaking a different language. The truth is that many of these names refer to the exact same mattress, and the confusion comes from decades of regional naming conventions, marketing decisions, and industry evolution.

Here in Brantford, Ontario, we hear customers ask about this topic almost every day at Mattress Miracle. Someone will come in asking for a "Full" mattress and wonder why we also call it a "Double." Or a couple will request a "King" and need clarification on whether that means a standard King or a California King. These are perfectly reasonable questions, and this guide will clear up every single one of them.

The Complete List of Mattress Size Names

Before we break down each size in detail, here is the full picture. Every standard mattress size sold in Canada has at least one alternate name, and some have several. Understanding these alternate names is the first step toward shopping smarter and avoiding costly mistakes like ordering a mattress that does not fit your bed frame.

Twin and Single: The Same Mattress, Two Names

The Twin mattress measures 38 inches wide by 75 inches long (96.5 x 190.5 cm). In Canada, this size is frequently called a Single, while in the United States, the name Twin is more common. Both names refer to the identical mattress.

The name "Twin" has an interesting origin. In the mid-20th century, it became fashionable for couples to sleep in separate beds placed side by side in the same room. Two of these narrower beds placed together were called "twin beds" because they came as a matching pair. The name stuck even though the practice of twin beds for couples has largely fallen out of favour.

The name "Single," on the other hand, is straightforward: it is a bed designed for a single person. This term remains the dominant one in Canada, the United Kingdom, Australia, and much of Europe. If you walk into Mattress Miracle and ask for either a Twin or a Single, our team will know exactly what you need.

A Twin mattress is ideal for children, teenagers, and single adults who do not need a lot of sleeping space. It also works well in smaller bedrooms, bunk beds, and trundle beds. For taller individuals, the Twin XL (also called a Single XL or Extended Twin) adds five extra inches in length, bringing the total to 38 x 80 inches.

Full and Double: The Most Misunderstood Size Name

The Full mattress measures 54 inches wide by 75 inches long (137 x 190.5 cm). In Canada and many Commonwealth countries, this same mattress is called a Double. The two names are completely interchangeable.

The name "Double" makes intuitive sense: at 54 inches wide, this mattress is roughly double the width of a Twin/Single (38 inches). For decades, the Double was the standard bed size for couples. Before the Queen size was introduced in the 1950s and 1960s, most married couples slept on a Double mattress.

The name "Full" emerged as a marketing term in the United States. Manufacturers wanted a name that sounded more generous and complete than "Double," which by that point was starting to feel cramped for two adults as average body sizes increased. "Full" implied that this was a full-sized bed, even though it was actually smaller than the Queen and King sizes that were beginning to appear on the market.

Today, a Full/Double is best suited for a single adult who wants more room than a Twin provides, or for a guest bedroom. While two adults can sleep on a Double, each person only gets 27 inches of width, which is less than a standard baby crib (28 inches). For couples, we strongly recommend a Queen or larger. You can read more about these comparisons in our guide to Twin vs Double vs Queen sizes in Canada.

Queen: The One Size With (Almost) No Alternate Name

The Queen mattress measures 60 inches wide by 80 inches long (152.5 x 203 cm). Unlike nearly every other mattress size, the Queen does not have a widely used alternate name. It is simply called a Queen everywhere in North America.

The Queen size was introduced in the late 1950s as a response to consumer demand for something between the Double and the King. It was an immediate hit. Today, the Queen is the single most popular mattress size sold in both Canada and the United States, accounting for roughly 47% of all mattress sales according to the International Sleep Products Association.

At 60 inches wide, a Queen gives each partner 30 inches of personal space, which is a noticeable improvement over the 27 inches offered by a Double. The 80-inch length also adds five crucial inches compared to a Full/Double, accommodating taller sleepers comfortably.

The Short Queen: A Special Name for a Special Purpose

The Short Queen is sometimes called an RV Queen or Three-Quarter Queen. It measures 60 inches wide by 75 inches long, which means it has the same width as a standard Queen but is five inches shorter. This size exists almost exclusively for recreational vehicles, campers, and travel trailers where space is at a premium.

If you own an RV and are shopping for a replacement mattress, it is essential to measure your sleeping platform carefully. Many RV owners mistakenly order a standard Queen and then discover it does not fit. At Mattress Miracle, we carry Short Queen options and can help you find the right fit for your vehicle.

King and Eastern King: The Same Bed, Two Regional Names

The King mattress measures 76 inches wide by 80 inches long (193 x 203 cm). This size is also called an Eastern King or Standard King. All three names describe the exact same mattress.

The term "Eastern King" originated to distinguish this size from the California King (or "Western King"). Since the California King was developed on the West Coast of the United States, the standard King became known as the "Eastern King" on the West Coast. In most of Canada, including here in Brantford and across Ontario, we simply call it a "King" without any directional qualifier, because the standard King is far more common in Eastern Canada than the California King.

A King mattress is essentially two Twin XL mattresses placed side by side. This is not just a fun fact; it has practical implications. A Split King (which we will discuss shortly) takes advantage of this exact configuration.

The King gives each partner 38 inches of personal sleeping space, which is the same width as an entire Twin mattress. This makes it the widest standard mattress available and the top choice for couples who want maximum room to spread out. It is also popular among families who co-sleep with young children, as the extra width provides enough room for a parent and child to sleep safely. Check out our guide on bed sizes in order for a visual comparison.

California King and Western King: The Tall Sleeper's Best Friend

The California King measures 72 inches wide by 84 inches long (183 x 213 cm). It is also called a Western King, Cal King, or occasionally a WK in industry shorthand.

The California King has a fascinating origin story. It was created in Los Angeles in the 1960s, reportedly to fit the larger bedrooms and taller residents of Southern California. Some accounts trace it to a furniture manufacturer who wanted to offer something for the many tall athletes and entertainers living in the area. The name "Western King" naturally followed, contrasting with the "Eastern King" used on the East Coast.

Despite being called a "King," the California King is actually four inches narrower than a standard King (72 inches vs. 76 inches). Where it gains is in length: at 84 inches (7 feet), it is the longest standard mattress available and the go-to choice for anyone over 6 feet tall who finds their feet hanging off a standard King or Queen.

One important consideration: California King sheets, bed frames, and accessories are not interchangeable with standard King products. If you buy a Cal King mattress, you need Cal King-specific bedding. This catches many shoppers off guard, so always double-check before purchasing.

Split King: Two Mattresses, One Bed

The Split King is also called a Dual King or Adjustable King. It consists of two Twin XL mattresses placed side by side on a single King-sized bed frame, creating the same overall dimensions as a standard King (76 x 80 inches).

The Split King is not a separate mattress size in the traditional sense. Instead, it is a configuration that allows each partner to choose a different mattress firmness, type, or brand. It is particularly popular with adjustable bed bases, where each side can be raised or lowered independently.

This configuration solves one of the biggest complaints couples have: different comfort preferences. If one partner prefers a firm mattress and the other prefers something softer, a Split King lets both people get exactly what they want without compromise. At Mattress Miracle, we often recommend the Restonic ComfortCare line for Split King setups because it offers a wide range of firmness options within the same collection, making it easy to find complementary models that work together on a shared frame.

Canadian vs. American Mattress Size Names

If you shop online from Canadian retailers, you will encounter a blend of Canadian and American naming conventions. This can create confusion, especially when a product listing uses one name and the specifications use another. Here is a quick reference guide to the naming differences:

In practice, most Canadian retailers use both sets of names interchangeably. You will see "Twin/Single" or "Full/Double" on many Canadian websites. The dimensions are identical regardless of which name is used, so the most important thing is to verify the measurements rather than relying solely on the name.

Historical Origins of Mattress Size Names

The naming conventions we use today have roots that stretch back over a century. Understanding where these names came from helps explain why the system can seem so inconsistent.

The Pre-Standardization Era (Before 1930s)

Before the 1930s, there were no standard mattress sizes. Beds were often custom-made by local craftspeople, and dimensions varied from one manufacturer to the next. If you moved to a new home, your mattress might not fit the bed frame you inherited or purchased. This lack of standardization was a constant source of frustration for consumers.

The First Standards (1930s-1950s)

In the 1930s, the American mattress industry began to standardize sizes. The two original standard sizes were what we now call the Twin (Single) and the Double (Full). These names reflected their intended use: a Single/Twin for one person, and a Double/Full for two. For roughly two decades, these were the only standard sizes available.

The Queen and King Era (1950s-1970s)

As post-war prosperity grew and average home sizes increased, consumers wanted bigger beds. The Queen and King sizes were introduced in the late 1950s and early 1960s. The royal naming convention (Queen, King) was a marketing strategy designed to convey luxury and spaciousness. The California King followed shortly after, emerging from the West Coast market.

Modern Additions (1980s-Present)

The Twin XL gained popularity in the 1980s when universities began using it as the standard dorm room bed size. The Split King emerged in the 2000s alongside the rise of adjustable bed bases. The Short Queen has been around since the RV industry boomed in the 1970s but remains a niche size.

Less Common Mattress Size Names You Might Encounter

Beyond the standard sizes, there are several less common names and sizes that occasionally appear in the market:

Three-Quarter Bed: This is an old-fashioned size measuring 48 x 75 inches, sitting between a Twin and a Double. It was common in the early 20th century but is rarely manufactured today. You may encounter this name when shopping for antique bed frames.

Olympic Queen: Measuring 66 x 80 inches, the Olympic Queen is six inches wider than a standard Queen. It never gained widespread adoption and is difficult to find bedding for, but some specialty manufacturers still produce it.

Grand King or Texas King: These oversized mattresses measure 80 x 98 inches or larger. They are specialty products that require custom frames and bedding. While impressive in size, they are impractical for most bedrooms and are not part of the standard sizing system.

Cot Size or Camp Bed: Measuring roughly 30 x 75 inches, this is the smallest standard mattress and is used primarily for portable cots and camping beds. It is narrower than a Twin/Single and is not intended for permanent use.

Choosing the Right Mattress Size for Your Bedroom

Knowing the names is only half the battle. You also need to choose the right size for your specific situation. Here are the key factors to consider:

Room Dimensions

Your bedroom needs to accommodate not just the mattress but also the bed frame, nightstands, dressers, and walking space. As a general rule, leave at least 24 inches of clearance on each side of the bed and 36 inches at the foot. Here are the minimum recommended room sizes:

Who Is Sleeping in the Bed

A single adult can sleep comfortably on a Twin/Single, but most adults prefer at least a Full/Double for extra room. Couples should strongly consider a Queen at minimum, with a King or California King being ideal if the room allows. For children, a Twin/Single is perfectly adequate until they reach their teenage years.

Height Considerations

If you or your partner are over 6 feet tall, look for mattresses with an 80-inch length at minimum. This rules out standard Twin and Full sizes (both 75 inches) in favour of their XL versions, or a Queen, King, or California King. The California King at 84 inches is the best option for very tall individuals.

Restonic ComfortCare: Available in Every Size Name

At Mattress Miracle, we proudly carry the Restonic ComfortCare collection, which is available in every standard mattress size. Whether you need a Twin/Single for a child's room, a Queen for the master bedroom, or a Split King for an adjustable base, the ComfortCare line has you covered.

What makes ComfortCare particularly well-suited for size comparisons is its consistent construction across all sizes. The same comfort layers, support systems, and quality materials are used whether you choose a Twin or a California King. This means you can test a Queen in our showroom and know that the comfort you feel will be identical in whatever size you ultimately choose.

The ComfortCare collection includes options ranging from firm to plush, with multiple support technologies including individually wrapped coils and high-density foam bases. Our team can help you find the right combination of size and firmness for your specific needs.

Common Mistakes When Shopping by Mattress Size Name

Over our decades in the mattress business, we have seen customers make the same mistakes over and over again. Here are the most common ones and how to avoid them:

Assuming "Full" is bigger than "Double": They are the same size. Do not pay more for a mattress labelled "Full" thinking it is larger than one labelled "Double."

Confusing King and California King: A standard King (Eastern King) is wider but shorter than a California King (Western King). Their sheets, frames, and foundations are not interchangeable. Always verify which one you need before purchasing accessories.

Ordering a Queen for an RV: Standard Queens are 80 inches long, but most RV sleeping platforms are designed for 75-inch Short Queens. Measure your RV platform before ordering.

Forgetting about door and stairway clearance: A King mattress is 76 inches wide, which can be difficult to manoeuvre through narrow hallways, around tight corners, or up steep staircases common in older Brantford homes. Measure every doorway and turn the mattress will need to pass through.

Buying a bed frame without confirming the size name used: An online retailer might list a frame as "Full" while your mattress was purchased as a "Double." They are the same size, but it is worth confirming the dimensions to avoid a panicked return.

Mattress Size Names Around the World

If you are shopping internationally or moving to Canada from another country, be aware that mattress sizes and their names vary significantly around the world:

United Kingdom: The UK uses Single (90 x 190 cm), Double (135 x 190 cm), King (150 x 200 cm), and Super King (180 x 200 cm). Note that a UK King is closer to a Canadian Queen, and a UK Super King is similar to, but not identical to, a Canadian King.

Europe (Continental): Most European countries use metric sizes that do not directly correspond to North American standards. Common sizes include 90 x 200 cm (similar to a Twin XL), 140 x 200 cm (similar to a Full), and 180 x 200 cm (similar to a King but slightly shorter).

Australia: Australian sizes are similar to those in the UK, with Single, Double, Queen, and King designations, but the dimensions differ slightly from both UK and North American standards.

The takeaway: if you are importing a mattress or bed frame from outside North America, always verify the exact dimensions rather than relying on the size name.

How to Remember All the Mattress Size Names

Here is a simple memory aid to keep the alternate names straight:

Twin = Single (one person, one name for each side of the border)

Full = Double (double the width of a Single, full-sized for one person)

King = Eastern King (the standard King, dominant in Eastern North America)

California King = Western King (born in California, the West Coast king)

Queen = Queen (no alternate name needed; it rules on its own)

Mattress Sizes in Quebec (Tailles de Matelas)

Quebec retailers list mattress sizes in French with the following standard mapping. Dimensions are identical to the rest of Canada.

• Lit simple / Jumeau: Twin (96 by 191 cm)
• Jumeau extra long / Twin XL: Twin XL (96 by 203 cm)
• Lit double: Double / Full (137 by 191 cm)
• Grand lit / Lit Queen: Queen (152 by 203 cm)
• Très grand lit / Lit King: Standard King (193 by 203 cm)
• Très grand lit californien: California King (183 by 213 cm)

Find Your Perfect Mattress Size at Mattress Miracle

Whether you call it a Twin or a Single, a Full or a Double, a King or an Eastern King, we have every size in stock at Mattress Miracle. Our team has been helping Brantford and the surrounding area sleep better since 1997, and we would love to help you find the perfect mattress in the perfect size for your bedroom.

Visit us at 441 1/2 West St, Brantford, Ontario or call (519) 770-0001 to speak with one of our sleep specialists. We are open Monday to Wednesday 10 AM to 6 PM, Thursday and Friday 10 AM to 7 PM, Saturday 10 AM to 5 PM, and Sunday 12 PM to 4 PM. Browse our full selection online at our mattress collection.