Quick Answer: A full size bed measures 4.5 feet wide by 6.25 feet long (54 × 75 inches or 137 × 191 cm). That gives one sleeper roughly 28 square feet of surface area. In Canada, "full" and "double" refer to the same mattress size, and our most popular full/double option at Mattress Miracle is the Restonic ComfortCare at $925.
In This Guide
Reading Time: 5 minutes
If you have been searching "full size bed dimensions in feet," you probably want a straight answer without scrolling through six pop-ups and a mattress quiz. Here it is: 4.5 feet wide, 6.25 feet long. That is 54 inches by 75 inches, or about 137 by 191 centimetres for anyone more comfortable with metric.
Now, that number alone does not tell you much. What matters is whether those dimensions actually work in your bedroom, for your body, and for how you sleep. That is what we will cover here.
Full Size Bed Dimensions: Feet, Inches, and Metric
Let us put every measurement in one place so you do not have to convert anything yourself.
| Measurement | Width | Length | Surface Area |
|---|---|---|---|
| Feet | 4.5 ft | 6.25 ft | 28.1 sq ft |
| Inches | 54 in | 75 in | 4,050 sq in |
| Centimetres | 137 cm | 191 cm | 2.6 m² |
One thing customers at our Brantford showroom sometimes ask: does thickness change the width or length? No. Mattress thickness (also called profile or height) only changes how tall the bed sits. A 10-inch full and a 15-inch full both measure 54 by 75 inches when you look down at them. Thickness does matter for sheet fit, bed frame clearance, and how easy it is to get in and out, but the footprint stays the same.
Full vs. Double: They Are the Same Size in Canada
This trips up a lot of shoppers. In Canada and the United States, "full" and "double" are two names for the exact same mattress, 54 by 75 inches. The name "double" comes from the idea that it is roughly double the width of a twin (39 inches), though it is actually only 15 inches wider. The name "full" just means it was once considered a full-size adult bed, before queen and king became the standard.
Brad, Owner, 40+ years of experience: "When I started in this business, most couples slept on a double. Today about 80% of our couples choose queen or larger. But for a single adult, a teenager who wants extra room, or a guest bedroom, a double still makes a lot of sense, and the price difference from a twin is usually modest."
If you are comparing full and double more closely, we covered that in our full size bed vs. double guide.
How Much Bedroom Space Do You Need for a Full Size Bed
A full size mattress itself takes up 28 square feet. But you need walking space around it, room to open drawers and closet doors, and enough clearance that the bedroom does not feel cramped.
Ontario Building Code Note: Under the Ontario Building Code (Section 9.5.7), a secondary bedroom must have at least 7 m² (roughly 75 square feet) of floor area. A master bedroom requires at least 9.8 m² (about 105 square feet). A full size bed fits comfortably in both, though the secondary bedroom will feel snug with other furniture.
Here is a practical room-size guide:
| Room Size | Full Size Bed Fit | Notes |
|---|---|---|
| 9 × 9 ft (81 sq ft) | Tight but workable | Bed plus one nightstand. Skip the dresser or use a wall shelf. |
| 9 × 10 ft (90 sq ft) | Good fit | Room for two nightstands and a small dresser. This is the sweet spot. |
| 10 × 12 ft (120 sq ft) | Plenty of space | Full furniture set with room to spare. Consider upgrading to queen if budget allows. |
A tip from our showroom: measure your door frames too. A full size mattress is 4.5 feet wide, and many older Brantford homes have interior doorways around 30 inches (2.5 feet). You may need to flex the mattress slightly or angle it to get it through. This is rarely a problem with foam or hybrid mattresses, but a traditional innerspring can be stiffer to manoeuvre. Our bed size chart has a visual comparison if you want to see all sizes side by side.
Who Actually Fits Comfortably on a Full Size Bed
At 54 inches wide, a full gives one person 27 inches of personal space, about shoulder width for an average adult. That is comfortable for most solo sleepers. For two people, each gets roughly 27 inches, which is less than the 27 inches you would get on a crib mattress. That is tight.
The Shoulder Width Test: Stand with your arms at your sides and measure across your shoulders. If your shoulder width is under 20 inches (most adults), you will sleep fine alone on a full. If two people each measure 18+ inches across the shoulders, the full leaves less than 9 inches of buffer on each side. That often means disturbed sleep when one partner rolls over.
Research published in Sleep Medicine Reviews found that sleep surface area directly affects how often partners disturb each other during the night, with larger sleep surfaces reducing the frequency and intensity of motion-related microarousals (Radwan et al., 2015). A separate study in the Journal of Chiropractic Medicine showed that upgrading to a new bedding system improved sleep quality scores by 60.7% among participants who had been sleeping on beds at least five years old (Jacobson et al., 2008).
Dorothy, Sleep Specialist: "I always ask couples how tall they are and whether they tend to spread out. If either partner is over 5'10" or a side sleeper who curls up wide, I usually suggest stepping up to a queen. The extra 6 inches of width and 5 inches of length really do change how well you both sleep."
For more on how full compares to smaller sizes, see our twin vs. full mattress guide.
How a Full Compares to Other Mattress Sizes
| Size | Width (ft) | Length (ft) | Best For |
|---|---|---|---|
| Twin | 3.25 | 6.25 | Children, single adults in small rooms |
| Twin XL | 3.25 | 6.67 | Taller teens, dorm rooms |
| Full / Double | 4.5 | 6.25 | Single adults, teens, guest rooms |
| Queen | 5 | 6.67 | Couples, anyone over 5'10" |
| King | 6.33 | 6.67 | Couples who want space, co-sleeping families |
Notice that a full and a twin share the same length, 6.25 feet (75 inches). If you are taller than about 6 feet, your feet may hang over the edge. In that case, a queen or king gives you an extra 5 inches of length, which usually solves the problem. We covered this comparison in detail in our double vs. queen bed guide.
Choosing a Base for Your Full Size Mattress
The mattress dimensions stay the same regardless of what you put it on, but the base affects total bed height, support, and longevity.
Common Full Size Bases
- Box spring: Adds 8-9 inches of height. Traditional pairing with innerspring mattresses. Our Restonic ComfortCare queen is $1,619; the full/double size is $925 and pairs well with a standard box spring.
- Platform bed frame: Slats or solid surface. No box spring needed. Keeps the bed lower to the ground.
- Adjustable base: Electric head and foot adjustment. Works with most foam and hybrid mattresses. Good for reading, acid reflux, or snoring relief.
- Metal bed frame: Budget-friendly option. Requires a box spring or bunkie board for mattress support.
A study published in Applied Ergonomics found that the support surface underneath a mattress affects pressure distribution and spinal alignment as much as the mattress itself (Defloor, 2000). So do not treat the base as an afterthought.
Bedding That Fits a Full Size Bed
Full size sheets are labelled "full" or "double," and they should measure roughly 81 by 96 inches (flat sheet) or 54 by 75 inches with a pocket depth of 12-16 inches (fitted sheet). If your full mattress is thicker than 14 inches, look for "deep pocket" fitted sheets to avoid the corners popping off at 3 a.m.
Canadian retailers sometimes label sheets as "double" while American brands use "full." Same thing, same fit. Check our bedding measurements Canada guide for a complete chart.
Need the right bed dimensions? Mattress Miracle at 441½ West Street in Brantford keeps all standard Canadian mattress sizes in stock. A full-size (also called double) is 54 x 75 inches, which is the same in Canada and the US. Talia has a size chart in the showroom and can help you figure out which size fits your bedroom with room to spare. Call (519) 770-0001.
Shop: View All Our Mattresses
Shop This Topic at Mattress Miracle
Popular picks at Mattress Miracle:
Or view all our mattresses in our Brantford showroom.
Find Your Perfect Mattress at Mattress Miracle
We are a family-owned mattress store in Brantford, helping our community sleep better since 1997. Come try mattresses in person and get honest, no-pressure advice.
441 1/2 West Street, Brantford, Ontario
Call 519-770-0001Frequently Asked Questions
Is a full size bed the same as a double in Canada?
Yes. Full and double are two names for the identical mattress size: 54 inches wide by 75 inches long (4.5 × 6.25 feet). Canadian retailers tend to use "double" more often, while American brands prefer "full." Either way, the dimensions are exactly the same.
Can two adults sleep on a full size bed?
Technically, yes, but each person gets only about 27 inches of width, less than a standard crib mattress. For occasional use in a guest room, it works. For every night, most couples find a queen (60 inches wide) noticeably more comfortable. Research in Sleep Medicine Reviews confirms that greater sleep surface area reduces partner-related sleep disruptions.
What is the minimum room size for a full bed?
A room of about 9 by 9 feet (81 square feet) is the functional minimum for a full bed with walking space on one side. For comfort with nightstands and a dresser, aim for at least 9 by 10 feet. The Ontario Building Code requires bedrooms to be at least 7 m² (75 square feet), which barely fits a full with room to walk.
Is a full size bed long enough for a 6-foot person?
It is borderline. A full is 75 inches (6.25 feet) long. If you are 6 feet tall, you have 3 inches of clearance, which usually works if you sleep on your back or side. If you sleep on your stomach with your toes pointed, or if you are taller than 6 feet, consider a queen or king for the extra 5 inches of length.
8 min read
Sources
- Radwan, A., Fess, P., James, D., et al. (2015). "Effect of different mattress designs on promoting sleep quality, pain reduction, and spinal alignment in adults with or without back pain; systematic review of controlled trials." Sleep Health, 1(4), 257-267. PubMed
- Jacobson, B. H., Boolani, A., & Smith, D. B. (2009). "Changes in back pain, sleep quality, and perceived stress after introduction of new bedding systems." Journal of Chiropractic Medicine, 8(1), 1-8. PMC
- Defloor, T. (2000). "The effect of position and mattress on interface pressure." Applied Nursing Research, 13(1), 2-11.
- Lopez-Torres, M., Porcar, R., Solaz, J., & Romero, T. (2008). "Sleeping mattress determinants and evaluation: a biomechanical review and critique." The Open Biomedical Engineering Journal, 2, 17-25. PMC
- Ontario Building Code, Section 9.5.7: Areas of Bedrooms. buildingcode.online
Visit Our Brantford Showroom
Mattress Miracle
441 1/2 West Street, Brantford
Phone: (519) 770-0001
Hours: Mon-Wed 10-6, Thu-Fri 10-7, Sat 10-5, Sun 12-4
Wondering whether a full or queen is the right call for your space? Bring your room measurements and Brad or Dorothy will help you figure it out in person. We carry full size mattresses starting at $925 with white glove delivery across the Brantford area.
Visit Our Brantford Showroom
We are located at 441½ West Street in downtown Brantford. Free parking available. Our team does not work on commission, so you get honest advice based on your needs.
Mattress Miracle , 441½ West Street, Brantford, ON · (519) 770-0001
Hours: Monday–Wednesday 10am–6pm, Thursday–Friday 10am–7pm, Saturday 10am–5pm, Sunday 12pm–4pm.