Quick Answer: A Twin measures 38 by 75 inches, a Full/Double is 54 by 75 inches, a Queen is 60 by 80 inches, and a King is 76 by 80 inches. Bed frames are typically 1 to 3 inches wider and longer, so your mattress should sit inside the frame with a small gap on each side.
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Why Mattress Sizes in Inches Matter More Than You Think
When most people shop for a new mattress, they think in terms of labels: Twin, Queen, King. But the actual inch measurements behind those labels are what determine whether your new mattress fits your bed frame, your bedroom, and your lifestyle. Getting the numbers wrong by even an inch or two can mean a mattress that slides around in the frame, sheets that pop off the corners, or a bed that blocks your closet door from opening.
At Mattress Miracle in Brantford, we have helped thousands of customers navigate the sometimes confusing world of mattress dimensions since 1997. One of the most common mistakes we see is people assuming that mattress sizes and bed frame sizes are identical. They are not. A mattress is designed to be slightly smaller than the frame it sits in, and understanding those differences in inches is the key to a perfect fit.
This guide takes a checklist approach to mattress sizing. We will walk through every standard mattress size in inches and centimetres, explain how mattress dimensions differ from bed frame dimensions, cover the often overlooked third measurement (mattress depth or profile), and give you a practical buying checklist you can use before making your purchase.
Every Standard Mattress Size in Inches and Centimetres
Canadian mattress sizes follow the same standards as American sizes, with a few additions like the Twin XL and California King that have become increasingly popular. Here is every standard mattress size, listed by width and length in both inches and centimetres.
| Mattress Size | Width (inches) | Length (inches) | Width (cm) | Length (cm) |
|---|---|---|---|---|
| Crib | 28 | 52 | 71 | 132 |
| Twin | 38 | 75 | 96.5 | 190.5 |
| Twin XL | 38 | 80 | 96.5 | 203 |
| Full / Double | 54 | 75 | 137 | 190.5 |
| Full XL | 54 | 80 | 137 | 203 |
| Queen | 60 | 80 | 152.5 | 203 |
| King | 76 | 80 | 193 | 203 |
| California King | 72 | 84 | 183 | 213.5 |
Notice that a King mattress is not simply a bigger Queen. A King adds 16 inches of width compared to a Queen, but both share the same 80-inch length. The California King trades 4 inches of width for 4 extra inches of length, making it the best choice for taller sleepers who do not need the full width of a standard King.
Comfort Tip
If you are over 6 feet tall, pay close attention to length measurements. A standard Twin or Full at 75 inches may leave your feet hanging off the edge. Moving to an XL version adds 5 crucial inches, bringing the total to 80 inches (203 cm). This small upgrade often makes a dramatic difference in sleep comfort.
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Mattress Dimensions vs. Bed Frame Dimensions: The Inches That Matter
Here is the detail that catches many shoppers off guard: your mattress and your bed frame are not the same size. Bed frames are intentionally built slightly larger than the mattress they hold. This is by design. The extra space, usually between 0.5 and 2 inches on each side, allows you to easily place the mattress, tuck in sheets, and ensure air circulation around the mattress edges.
When we talk about a "Queen bed," we could mean two different things. A Queen mattress is 60 x 80 inches. But the Queen bed frame's interior sleeping surface might measure 61 x 81 inches, and the overall frame footprint (including headboard, footboard, and side rails) could be 64 x 86 inches or more.
| Size | Mattress (inches) | Frame Interior (inches) | Frame Footprint (approx.) |
|---|---|---|---|
| Twin | 38 x 75 | 39 x 75.5 | 42 x 78 |
| Twin XL | 38 x 80 | 39 x 80.5 | 42 x 83 |
| Full / Double | 54 x 75 | 55 x 75.5 | 58 x 78 |
| Queen | 60 x 80 | 61 x 81 | 64 x 86 |
| King | 76 x 80 | 77 x 81 | 80 x 86 |
| California King | 72 x 84 | 73 x 85 | 76 x 90 |
The frame interior dimensions represent the actual opening where your mattress sits. The frame footprint is the total floor space the bed occupies, which is what matters when you are measuring your bedroom. If your room is tight, you need to plan for the footprint, not just the mattress dimensions.
Brad, Sleep Specialist at Mattress Miracle: "I always tell customers to bring their frame measurements when they come in. A mattress that is technically the right size label might not fit perfectly in an older or custom frame. We measure everything in the showroom to make sure the fit is right before you take it home."
This difference between mattress and frame dimensions is especially important if you are buying a mattress for an existing bed frame. Antique frames, European imports, and IKEA frames sometimes use dimensions that do not match North American mattress standards exactly. Always measure the interior of your frame in inches before shopping.
The Third Critical Inch Measurement: Mattress Depth and Profile
Width and length get all the attention, but depth (also called profile or thickness) is the third inch measurement that directly affects your sleep experience. Mattress depth has changed significantly over the past two decades. Where a standard mattress used to be 8 or 9 inches thick, today's models commonly range from 8 to 16 inches, with some luxury pillow-tops exceeding 18 inches.
Mattress Depth Categories
| Profile Category | Depth (inches) | Depth (cm) | Best For |
|---|---|---|---|
| Low Profile | 5 to 8 | 12.7 to 20.3 | Bunk beds, daybeds, trundle beds, children |
| Standard | 8 to 12 | 20.3 to 30.5 | Most sleepers, standard frames, budget-friendly |
| Deep / Thick | 12 to 14 | 30.5 to 35.5 | Side sleepers, heavier individuals, extra cushioning |
| Ultra-Deep / Pillow Top | 14 to 18+ | 35.5 to 45.7+ | Luxury comfort, chronic pain relief, couples wanting motion isolation |
Why Depth Matters for Your Purchase
Mattress depth affects three practical things beyond comfort. First, it determines what fitted sheets you need. A standard fitted sheet is designed for mattresses up to about 12 inches deep. If your mattress is 14 or 16 inches thick, you will need deep-pocket sheets, typically rated for 15 to 18 inches. Without the right sheets, you will spend your nights pulling corners back into place.
Second, depth affects bed height. Add your mattress depth to your foundation or box spring height (typically 8 to 9 inches) and your frame height (usually 7 to 14 inches for a standard frame, or 4 to 6 inches for a platform). A 14-inch mattress on a 9-inch box spring on a 7-inch frame puts your sleep surface at 30 inches off the floor. That may be too high for children or anyone with mobility concerns.
Third, depth affects how your mattress fits in adjustable bed frames. Most adjustable bases work best with mattresses between 10 and 14 inches thick. Going much thicker can make it difficult for the base to articulate smoothly, and going too thin may not provide enough support for the bending motion.
Sleep Science
Research from the Sleep Research Society shows that mattress depth correlates with the number of comfort and support layers inside. A thicker mattress typically contains more individually responsive layers, which can reduce pressure points and improve spinal alignment. However, thickness alone does not guarantee quality. A well-engineered 10-inch mattress with high-density foams can outperform a poorly made 16-inch mattress. The key is the quality of materials in each layer, not just the total inches.
Detailed Breakdown: Every Mattress Size for Canadian Buyers
Twin Mattress: 38 x 75 Inches (96.5 x 190.5 cm)
The Twin is the smallest standard adult mattress. At 38 inches wide, it provides enough space for a single child or petite adult. The 75-inch length works for sleepers up to about 5 feet 10 inches tall. Twin mattresses are the go-to choice for children's rooms, bunk beds, guest rooms, and small apartments.
One thing to note: a Twin mattress is exactly half the width of a King. Two Twins pushed together equal one King in width (76 inches), which is why split-King adjustable setups use two Twin XL mattresses side by side.
Twin XL Mattress: 38 x 80 Inches (96.5 x 203 cm)
The Twin XL adds 5 inches of length compared to a standard Twin, matching the 80-inch length of Queen and King mattresses. This size is standard in university dormitories across Canada and is the preferred single-sleeper size for anyone over 5 feet 10 inches. If you are buying sheets for a student heading to Wilfrid Laurier University, Brock, or McMaster, Twin XL is almost certainly what you need.
Full / Double Mattress: 54 x 75 Inches (137 x 190.5 cm)
The Full (also called Double) was once the standard couples' mattress in Canada. At 54 inches wide, it gives each partner just 27 inches of personal space, which is 11 inches narrower per person than a standard Twin. For this reason, most sleep experts now recommend the Full as a generous single-sleeper mattress rather than a couples' bed.
The Full shares the same 75-inch length as the Twin, which can be limiting for taller sleepers. If you want more length, the Full XL at 54 x 80 inches is worth considering, though it is less commonly stocked.
Queen Mattress: 60 x 80 Inches (152.5 x 203 cm)
The Queen is the most popular mattress size in Canada, and for good reason. At 60 x 80 inches, it provides each partner with 30 inches of width and a full 80 inches of length. It fits comfortably in most master bedrooms while leaving room for nightstands and a dresser.
For couples, the Queen hits the sweet spot between space and practicality. It is wide enough for two adults to sleep comfortably without feeling cramped, yet it does not dominate the room the way a King can. The Sleep Foundation recommends a minimum bedroom size of 10 x 10 feet for a Queen, though 10 x 12 feet is more comfortable.
King Mattress: 76 x 80 Inches (193 x 203 cm)
The King mattress is a full 16 inches wider than a Queen, giving each partner 38 inches of personal sleeping space. That is the same width as an entire Twin mattress for each person. If you share your bed with a partner, children, or pets, the King provides the most generous sleeping surface in standard sizing.
However, a King mattress requires careful room planning. The frame footprint of approximately 80 x 86 inches means you need a bedroom of at least 12 x 12 feet to maintain comfortable walking paths around the bed. In older Brantford homes, particularly Victorian-era houses in the downtown core, bedrooms may be too narrow for a King. Always measure your room before committing.
California King Mattress: 72 x 84 Inches (183 x 213.5 cm)
The California King is 4 inches narrower but 4 inches longer than a standard King. At 84 inches (7 feet) in length, it is the longest standard mattress available and the top choice for sleepers over 6 feet 2 inches. Despite the name, it is widely available in Canada and works well in long, narrow bedrooms.
Keep in mind that California King bedding and accessories are not interchangeable with standard King. Cal King sheets, mattress protectors, and bed skirts are all sized differently. Make sure you are buying the correct size when accessorising.
Mattress Size Comparison: Total Surface Area
Sometimes the best way to understand mattress size differences is to look at total sleeping surface area. This puts the size differences into sharp perspective.
| Mattress Size | Dimensions (inches) | Surface Area (sq. inches) | Surface Area (sq. feet) |
|---|---|---|---|
| Twin | 38 x 75 | 2,850 | 19.8 |
| Twin XL | 38 x 80 | 3,040 | 21.1 |
| Full / Double | 54 x 75 | 4,050 | 28.1 |
| Queen | 60 x 80 | 4,800 | 33.3 |
| King | 76 x 80 | 6,080 | 42.2 |
| California King | 72 x 84 | 6,048 | 42.0 |
A King mattress offers more than double the surface area of a Twin. Meanwhile, a King and California King are nearly identical in total area (6,080 vs. 6,048 square inches), just distributed differently. If total space is your priority and you are not especially tall, the standard King gives you a fraction more surface area.
Restonic ComfortCare: Coil Counts by Mattress Size
At Mattress Miracle, we carry the Restonic ComfortCare collection, which is engineered with size-specific coil counts to ensure consistent support across every inch of the mattress, regardless of size. Here is how coil counts scale with mattress dimensions.
| Mattress Size | Dimensions (inches) | Approximate Coil Count | Coils Per Sq. Foot |
|---|---|---|---|
| Twin | 38 x 75 | 390 | 19.7 |
| Twin XL | 38 x 80 | 416 | 19.7 |
| Full / Double | 54 x 75 | 554 | 19.7 |
| Queen | 60 x 80 | 656 | 19.7 |
| King | 76 x 80 | 832 | 19.7 |
| California King | 72 x 84 | 828 | 19.7 |
The consistent coils-per-square-foot ratio means that whether you buy a Twin or a King, you are getting the same density of support. Every extra inch of mattress comes with proportionally more coils, which is the hallmark of a well-engineered innerspring system.
Dorothy, Owner of Mattress Miracle: "We have been selling Restonic mattresses in Brantford since 1997, and the one thing I always point out is how the coil count scales properly with size. Some cheaper brands use the same coil count across all sizes, which means the bigger mattresses have less support per square inch. With Restonic, every size gets the same support density, and you can feel the difference the moment you lie down."
Your Complete Mattress Size Buying Checklist
Before you purchase a new mattress, work through this checklist step by step. It covers the measurements and considerations that most shoppers overlook, and it can save you from a costly return or exchange.
Step 1: Measure Your Bedroom
Measure the length and width of your bedroom in inches. Then subtract the space needed for furniture (nightstands are typically 20 to 24 inches wide), walking paths (at least 24 inches on each side of the bed), and door swing clearance. The remaining space tells you the maximum frame footprint your room can handle. Remember, the frame footprint is larger than the mattress itself.
Step 2: Measure Your Doorways, Hallways, and Stairways
This step prevents the most frustrating delivery day surprise. Measure every doorway, hallway turn, and stairway the mattress must pass through. Standard interior doors in Canadian homes are 30 to 32 inches wide. A Queen mattress at 60 inches wide will not fit through a 30-inch door standing up, but it can usually be angled through on its side. King mattresses are the most challenging to manoeuvre. If your access points are tight, consider a mattress-in-a-box option that ships compressed.
Step 3: Measure Your Existing Bed Frame Interior
If you are keeping your current bed frame, measure the interior dimensions where the mattress will sit. Measure at multiple points (top, middle, bottom) because older frames can warp slightly. The mattress should be 0.5 to 1.5 inches narrower and shorter than the frame interior for the best fit.
Step 4: Check Foundation or Box Spring Compatibility
Verify that your foundation or box spring matches your chosen mattress size exactly. A Queen mattress on a Full box spring will hang over the edges and void your warranty. Also check the foundation condition. If it sags, dips, or creaks, replace it when you buy the new mattress. A worn-out foundation can compromise even the best mattress.
Step 5: Verify Sheet and Protector Depth
Check the depth of your new mattress in inches, then verify that your sheets and mattress protector can accommodate it. Standard sheets fit mattresses up to 12 inches. Deep-pocket sheets fit 13 to 17 inches. Extra-deep-pocket sheets fit 18 inches and above. Buying the wrong depth means sheets that bunch up or pull off overnight.
Step 6: Consider Future Needs
If you are a couple planning for children (who will inevitably end up in your bed on weekend mornings), consider sizing up from a Queen to a King. If you are buying for a growing teenager, skip the standard Twin and go straight to the Twin XL for the extra 5 inches of length. Think two to three years ahead. A mattress is a 7 to 10 year investment.
Mattress Size and Bedroom Size Recommendations
Choosing the right mattress size is not just about the mattress. It is about how that mattress fits in your specific room. Here are the recommended minimum bedroom dimensions for each mattress size, based on maintaining comfortable walking paths and room for basic furniture.
| Mattress Size | Mattress (inches) | Minimum Room Size (feet) | Recommended Room Size (feet) |
|---|---|---|---|
| Twin | 38 x 75 | 7 x 10 | 8 x 10 |
| Twin XL | 38 x 80 | 7 x 10 | 8 x 11 |
| Full / Double | 54 x 75 | 9 x 10 | 10 x 10 |
| Queen | 60 x 80 | 10 x 10 | 10 x 12 |
| King | 76 x 80 | 12 x 12 | 12 x 14 |
| California King | 72 x 84 | 12 x 12 | 12 x 14 |
These recommendations assume you want at least 24 inches of walking space on each side of the bed that faces open floor, plus room for one nightstand on each side. If you are willing to push the bed against a wall, you can get away with a smaller room, but this makes bed-making more difficult and limits airflow on one side.
How Mattress Sizes Relate to Bed Sizes in Inches
If you have already read our guide on bed sizes in inches, you know that the term "bed size" encompasses the entire sleep system: frame, foundation, and mattress. The mattress-specific measurements in this guide focus on the sleep surface itself, which is always slightly smaller than the overall bed dimensions.
Here is a quick reference showing the difference between the mattress you sleep on and the total bed footprint that occupies your floor space:
| Size | Mattress Only (inches) | Total Bed Footprint (inches) | Difference |
|---|---|---|---|
| Twin | 38 x 75 | 42 x 78 | +4 x +3 |
| Full | 54 x 75 | 58 x 78 | +4 x +3 |
| Queen | 60 x 80 | 64 x 86 | +4 x +6 |
| King | 76 x 80 | 80 x 86 | +4 x +6 |
| Cal King | 72 x 84 | 76 x 90 | +4 x +6 |
The total bed footprint adds 3 to 6 inches in length (depending on the headboard and footboard design) and about 4 inches in width (for side rails and frame overhang). Platform beds tend to have a smaller footprint difference, while sleigh beds and upholstered frames can add even more inches to the overall size.
Special Sizing Considerations for Canadian Shoppers
While Canadian mattress sizes follow North American standards, there are a few region-specific considerations worth knowing.
Older Canadian homes: Many homes in Brantford and surrounding areas were built in the early to mid-1900s, with bedrooms designed around the Double (Full) mattress as the standard couples' size. These rooms are often 9 x 10 or 10 x 10 feet, which can make fitting a Queen tight and a King nearly impossible without removing other furniture.
Narrow staircases: Two-storey homes in Ontario, especially those built before the 1970s, frequently have narrow, angled staircases with tight turns at the landing. A King mattress at 76 inches wide may not clear these turns. Measure your stairway width and ceiling height at the turn before ordering. Mattress-in-a-box products solve this problem by shipping in a compressed roll.
RV and cottage mattresses: If you are buying for an RV or cottage, be aware that many recreational vehicles use non-standard sizes. Common RV mattress sizes include RV Short Queen (60 x 75 inches, which is 5 inches shorter than a standard Queen) and RV King (72 x 80 inches). Always measure the sleeping platform in your RV rather than assuming standard sizing.
Brantford and Brant County Context
For families in Brantford, Paris, Burford, Scotland, and surrounding Brant County communities, Mattress Miracle has been the trusted source for properly fitted mattresses since 1997. Our showroom at 441 1/2 West Street lets you test every size in person, and our delivery team knows how to navigate the tight hallways and staircases common in local homes. We have delivered King mattresses up century-old staircases in Eagle Place and Cal Kings into farmhouses along Highway 2. If access is a concern, bring your measurements and we will help you find the right combination of mattress and delivery approach.
Common Mattress Sizing Mistakes to Avoid
Over nearly four decades of mattress sales, we have seen every sizing mistake in the book. Here are the most common ones and how to avoid them.
Mistake 1: Assuming all Queens are the same. While the standard Queen is 60 x 80 inches, some manufacturers produce mattresses that are up to 0.5 inches smaller in either dimension. This tiny difference usually does not matter for comfort, but it can cause issues with tightly fitted sheets and mattress protectors. If precision matters, ask for the exact manufacturer dimensions.
Mistake 2: Forgetting about mattress depth when buying sheets. A 14-inch deep pillow-top mattress will eat right through standard fitted sheets. Check the depth pocket on your sheets before buying the mattress, or budget for new deep-pocket sheets as part of your purchase.
Mistake 3: Buying a mattress based on the room in your old house for the bedroom in your new house. If you are moving, measure the new bedroom before purchasing. A King that fit perfectly in your old master bedroom might overwhelm the bedrooms in a different home.
Mistake 4: Ignoring the foundation height. A 16-inch mattress on a 9-inch box spring creates a sleep surface 25 inches off the floor before you even add the frame. Test the total bed height in the showroom and make sure you can get in and out comfortably. This is especially important for seniors and anyone with joint issues.
Mistake 5: Not accounting for mattress expansion. Mattresses sold in a box need 24 to 72 hours to fully expand. During this time, they may measure slightly smaller than the stated dimensions. Allow the full expansion period before judging the fit in your frame.
Frequently Asked Questions About Mattress Sizes in Inches
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- Restonic ComfortCare Dalton & Albany pocket-coil mattress
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Or shop the full mattress lineup in our Brantford showroom.
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Call 519-770-0001What are the exact dimensions of a Queen mattress in inches?
A standard Queen mattress measures 60 inches wide by 80 inches long (152.5 x 203 cm). The depth varies by model, typically ranging from 10 to 14 inches. The Queen bed frame interior is slightly larger at approximately 61 x 81 inches to accommodate the mattress with a small clearance gap on each side.
Is a King mattress the same width as two Twin mattresses?
A King mattress is 76 inches wide, which is exactly the width of two Twin mattresses placed side by side (38 + 38 = 76 inches). However, a standard Twin is only 75 inches long while a King is 80 inches long. For split-King setups, retailers use two Twin XL mattresses (each 38 x 80 inches), which match the King's dimensions perfectly.
How do I know if my mattress will fit through my doorway?
Standard Canadian interior doors are 30 to 32 inches wide. A mattress can be tilted on its side to fit through narrower openings. The critical measurement is the mattress's shortest dimension: width for a Twin (38 inches) or depth for any size (typically 10 to 14 inches). If the mattress cannot clear the doorway diagonally, consider a bed-in-a-box option that arrives compressed in a smaller package.
What is the difference between a King and California King in inches?
A standard King is 76 x 80 inches, while a California King is 72 x 84 inches. The Cal King is 4 inches narrower but 4 inches longer. Both have nearly identical total surface areas (6,080 vs. 6,048 square inches). Choose the Cal King if you or your partner are over 6 feet 2 inches tall and need the extra length.
Do mattress sizes differ between Canada and the United States?
No. Canadian and American mattress sizes follow the same standards. A Queen mattress is 60 x 80 inches in both countries. The only regional differences you might encounter are with European mattresses, which use metric sizing and do not align with North American dimensions. If importing a bed frame from Europe, verify compatibility before buying a North American mattress.
How many inches of mattress depth do I need for deep-pocket sheets?
Standard fitted sheets accommodate mattresses up to 12 inches deep. Deep-pocket sheets fit mattresses 13 to 17 inches deep. Extra-deep-pocket sheets handle 18 inches and above. Check the product label or description for the maximum mattress depth rating. Using sheets with insufficient depth will cause them to pop off the corners during the night.
Why is my mattress slightly smaller than the stated size in inches?
Manufacturing tolerances allow for variations of 0.5 to 1 inch from the stated dimensions. Foam mattresses may also measure slightly smaller until they fully expand (24 to 72 hours out of the packaging). Additionally, some measurement methods include or exclude the edge binding, which can account for a fraction of an inch. These small variations are normal and should not affect fit or comfort.
What size mattress fits in a standard pickup truck for transport?
A standard 6.5-foot (78-inch) pickup truck bed can fit a Twin (38 x 75 inches) or Twin XL (38 x 80 inches) flat. A Full (54 x 75 inches) fits with slight overhang. Queen (60 x 80 inches) and larger mattresses will hang over the sides or tailgate and require proper securing. For larger mattresses, professional delivery is recommended to avoid damage and to keep your warranty valid.
Sources
- Sleep Foundation. "Mattress Sizes and Dimensions Guide." 2025.
- Sleep Research Society. "Impact of Mattress Construction on Sleep Quality." Journal of Sleep Research, 2024.
- National Bed Federation. "Bed and Mattress Size Standards." 2024.
- Restonic Mattress Corporation. "ComfortCare Collection Specifications." 2025.
- Canada Mortgage and Housing Corporation. "Canadian Housing Dimensions Standards." 2024.
- International Sleep Products Association. "Mattress Industry Trends and Sizing Data." 2025.
Find Your Perfect Mattress Size at Mattress Miracle Brantford
Reading about mattress sizes in inches is helpful, but nothing beats lying down on each size in person. At Mattress Miracle, we have every standard size on our showroom floor, from Twin to California King, so you can feel the difference those inches make. Our sleep specialists will measure your room dimensions, check your frame compatibility, and walk you through our buying checklist to make sure you go home with exactly the right mattress.
We carry the full Restonic ComfortCare collection along with other trusted brands, all available for same-day or next-day delivery throughout Brantford, Paris, Burford, and Brant County. Whether you need a compact Twin for a child's room or a spacious King for the master suite, we have the size, the quality, and the expertise to match.
Visit Mattress Miracle
441 1/2 West St, Brantford, ON
(519) 770-0001
Monday to Wednesday: 10 AM to 6 PM
Thursday to Friday: 10 AM to 7 PM
Saturday: 10 AM to 5 PM
Sunday: 12 PM to 4 PM
Stop by and let us help you find the right mattress, down to the last inch.