Bed Sizes in Inches: Canadian Guide with Centimetre Conversions 2026

Reading Time: 14 minutes

Buying a mattress should not feel like a math exam. But when someone quotes you a size in inches and your brain goes blank, that is exactly how it feels. You are standing in a showroom, a salesperson is gesturing at a big white rectangle, and you are quietly wondering whether a Queen will even fit through your bedroom door.

We get that question at Mattress Miracle in Brantford all the time. So here is the complete, plain-English guide to every standard bed size in inches, with Canadian centimetre conversions, real room size requirements, and enough detail that you can walk in knowing exactly what you need before anyone says a word.

Brad has been selling mattresses on West Street since 1997. Dorothy has been helping customers figure out what their bodies actually need for nearly as long. Between them, they have answered the sizing question about ten thousand times. This article is what they would tell you over coffee.

Complete Bed Size Chart: Inches and Centimetres

Let us start with the numbers, clean and simple. Every size below reflects the mattress itself. Your bed frame and box spring will add a few inches around the perimeter, so always measure your room against the mattress dimension plus roughly two to four inches on each side for the frame rail.

A note on Canadian vs. American sizing: the dimensions above are identical across the border. A Queen in Brantford is the same mattress as a Queen in Buffalo. What changes is pricing (our dollar), availability of certain specialty sizes, and the fact that California King bedding can be harder to find at local shops. Keep that in mind before you fall in love with a Cal King frame on an American website.

Twin and Twin XL: Who They Are Really For

The Twin at 38 x 75 inches is the smallest standard size. It is 38 inches wide, which is narrower than the average adult shoulder span when arms are relaxed outward. Children under 12 sleep on Twins comfortably. Adults can, but most find them just barely adequate, not truly restful.

The Twin XL adds five inches of length, landing at 38 x 80 inches (97 x 203 cm). That length matches a Queen, which is why dormitories in North America default to Twin XL. A 6-foot teenager will not have their feet hanging off the end. A 5-foot-6 adult who is living solo in a small apartment will find a Twin XL perfectly workable.

At Mattress Miracle, the Restonic ComfortCare Twin uses 690 individually pocketed coils. That sounds modest until you consider the mattress is 38 inches wide. That coil count per square inch puts it on par with the support density of much larger models. Brad often points this out to parents who assume a children's mattress can be low quality because kids are light. Growing spines need proper support too, sometimes more urgently than adult spines that have already finished developing.

Double (Full): The Forgotten Middle Child

The Double, also called Full in American listings, measures 54 x 75 inches (137 x 191 cm). It is 16 inches wider than a Twin and exactly the same length. That extra width is enough for one adult to sleep without feeling cramped. Two adults on a Double share 27 inches each, which is roughly the width of a standard office chair. Functional, but not spacious.

Doubles were the default couple's mattress in Canada through the mid-20th century. Then Queen sizes became affordable, and most couples moved on. The Double survived as a guest room favourite and a practical choice for single adults in smaller bedrooms who want more room to sprawl than a Twin allows.

One practical consideration: Double mattresses use the same length as a Twin (75 inches). Tall sleepers over 6 feet will find their toes at the edge. If you are setting up a guest room that will occasionally host tall visitors, a Queen or Twin XL may serve you better than a Double even if the Double would technically fit the room.

See our full comparison at Twin vs. Double vs. Queen Canada if you are weighing those three sizes side by side.

Queen: Why Most Couples Land Here

Mattress sizes bedroom comparison showing Queen and King dimensions - Mattress Miracle Brantford" loading="lazy" width="1880" height="1255">

The Queen at 60 x 80 inches (152 x 203 cm) is the best-selling mattress size in Canada, and it has been for years. There is a reason for that. A Queen gives each person in a couple 30 inches of personal width, which is six inches more than a Double per person. That difference feels significant at 2 a.m. when your partner turns over.

The 80-inch length accommodates most adults comfortably, including people up to about 6 feet 2 inches who sleep flat. If you sleep with your head on a thick pillow and your body naturally slides a few inches down the mattress, even 6-footers usually find a Queen adequate.

At Mattress Miracle, the most popular Queen in the store is the Restonic ComfortCare Queen at $1,619. It uses 1,222 individually pocketed coils, each working independently rather than as a connected grid. When your partner gets up for water at midnight, those isolated coils absorb their movement locally rather than broadcasting it across the entire mattress surface. That is the practical difference between pocketed coils and older connected spring systems, and it is why couples who upgrade from an older mattress often feel like a different category of well-rested after the first week.

The flagship of the Queen lineup is the Revive St Charles at $3,150. It sits at 15 inches of total depth, uses 1,188 precision coils, and is available in both the St Charles and Elizabeth configurations. Dorothy describes it as the mattress you buy once and do not think about again for fifteen years.

If you are weighing a Queen against other options, our Queen Mattress Sale Canada 2026 page shows current pricing and promotions we have running.

King and California King: Know the Difference

This is where a lot of people get tripped up. A King and a California King are not the same size. They actually trade dimensions against each other, and choosing the wrong one causes real headaches when your new bed frame arrives and does not fit your new mattress.

The King is wider. The California King is longer. A standard King is 76 inches wide, giving each partner in a couple 38 inches of personal space, which is the same as sleeping alone on a Twin. For couples who want genuine independence of movement, that is the appeal.

The California King is 72 inches wide (183 cm) and 84 inches long (213 cm). It surrenders four inches of width compared to a King but adds four inches of length. For someone 6 feet 4 inches or taller, that extra length is meaningful. For someone 5 feet 10 inches, those four added inches just disappear under the duvet and contribute nothing.

The Restonic ComfortCare King at Mattress Miracle uses 1,440 individually pocketed coils and is priced at $2,051. Per coil, per dollar, it is excellent value for a King mattress in the Canadian market.

For a broader look at how these sizes line up in order, our bed size order guide walks through the full sequence from smallest to largest.

Room Size Requirements for Each Bed

A mattress that is technically too large for your room is not just aesthetically awkward. It creates a bedroom where you cannot open a dresser drawer fully, where you squeeze past the footboard every morning, and where the room starts to feel like a storage unit with a mattress in the middle. That is not restful.

The general rule of thumb is to leave at least 24 inches (about 61 cm) of walking clearance on each open side of the bed. This applies to both sides for couples and at least one side plus the foot of the bed for single sleepers.

Mattress Depth: The Inches You Sleep On

The size of a mattress is typically discussed in width and length. But there is a third dimension that affects your sleep directly: depth, also called height or thickness. This is the number you see on a tag when it says "8-inch mattress" or "15-inch plush top."

Depth matters for fitted sheet sizing too. Standard fitted sheets accommodate mattresses up to about 12 inches. If you have a 14 or 15-inch mattress, you need deep-pocket sheets. The Revive St Charles at 15 inches is firmly in deep-pocket territory. Dorothy reminds every customer buying that model to check their linen before the delivery arrives.

For back pain considerations and how mattress depth intersects with firmness choices, see our best mattress for back pain Canada 2026 guide.

Couples Guide: Personal Space Per Person

When two people share a mattress, the relevant number is not the total width. It is how many inches each person gets. Here is what that looks like across all standard sizes:

The jump from Double to Queen is 3 inches per person. That sounds minor, written as a number. In practice, at 2 a.m., it is the difference between feeling someone else's warmth and feeling someone else's elbow. The jump from Queen to King is 8 inches per person. That is significant. That is enough space that a couple can both sleep on their preferred sides without interference, even if both are back sleepers who favour a slight diagonal.

Pet owners deserve a special mention here. A medium-sized dog who sleeps on the bed occupies roughly the same space as a large pillow placed horizontally. Two cats can somehow collectively occupy 40 percent of any mattress regardless of size. If your pets share your sleep surface, account for them honestly when choosing a size. A couple who already wants more space and shares the bed with a Golden Retriever belongs in a King.

What Brad and Dorothy Recommend at the Store

After 38 years at 441 1/2 West Street, Brad has a practical sense of what Brantford households actually need. The showroom at Mattress Miracle carries mattresses across all standard sizes, and the team has a habit of steering people toward the choice that fits their life, not just the one that fits the room.

Talia, who handles the showroom floor day-to-day, keeps a tape measure at the front desk. When someone comes in uncertain about sizing, she often asks them to hold one end of the tape while she walks the other end out to the appropriate length. Something about physically holding the dimension in your hands makes it real in a way that a chart on a screen never quite does.

You can browse the full range at Mattress Miracle mattress collections. Sizes are noted on each product page, and the team can order sizes that are not on the floor if needed.

For further size comparison context, the bed sizes in feet guide translates all these dimensions into the unit most people use when measuring a room.