Bed Size Guide: Twin, Full, Queen & King Mattress Dimensions
Choosing a mattress is a lot easier when you can see the sizes side by side. Here are the standard U.S. mattress dimensions in inches and centimeters, who each size works best for, and how to measure your bedroom before you buy.
Mattress size chart in inches and centimeters
| Size | Inches (W × L) | Centimeters | Feet | Best for |
|---|---|---|---|---|
| TwinSpanish: Individual | 38 × 75 in | 96.5 × 190.5 cm | 3′2″ × 6′3″ | Kids, bunk beds, daybeds, small guest rooms |
| Twin XLSpanish: Individual XL | 38 × 80 in | 96.5 × 203.2 cm | 3′2″ × 6′8″ | Tall teens, single adults, dorm-style rooms |
| FullSpanish: Matrimonial | 54 × 75 in | 137.2 × 190.5 cm | 4′6″ × 6′3″ | One adult who wants room to stretch, guest rooms |
| QueenSpanish: Queen / Reina | 60 × 80 in | 152.4 × 203.2 cm | 5′ × 6′8″ | Couples, primary bedrooms, most adults |
| KingSpanish: King / Rey | 76 × 80 in | 193 × 203.2 cm | 6′4″ × 6′8″ | Couples who want more space, plus kids or pets |
These are standard U.S. mattress sizes. Actual mattresses can vary slightly by brand, so check the measurements on each product before you buy.
Who each mattress size fits
Twin (Individual)
38 × 75 in · 96.5 × 190.5 cm
Fits: One child or one smaller adult.
The classic first “big kid” bed and the standard size for most bunk beds and daybeds. At 75 inches (6′3″) long, it works for kids and many adults, but taller teens may outgrow it.
Twin XL (Individual XL)
38 × 80 in · 96.5 × 203.2 cm
Fits: One teen or adult, including taller sleepers.
Same width as a Twin but 5 inches longer. A good pick for growing teens or anyone over 6 feet who sleeps alone and needs to save floor space.
Full (Matrimonial)
54 × 75 in · 137.2 × 190.5 cm
Fits: One adult comfortably, or two in a tight fit.
Sixteen inches wider than a Twin. Great for a single adult, a teen’s room or a guest room. Two adults can share it, but each person gets only 27 inches—about the width of a crib mattress.
Queen (Reina)
60 × 80 in · 152.4 × 203.2 cm
Fits: Two adults.
The most popular size for couples. Each person gets 30 inches of width, and the 80-inch length fits taller sleepers. It fits most primary bedrooms.
King (Rey)
76 × 80 in · 193 × 203.2 cm
Fits: Two adults with room to spare—or a child or pet joining in.
The widest standard size. Each adult gets 38 inches, the same width as a whole Twin mattress. It needs a larger room, so measure first.
Comparing mattress sizes
Twin vs. Twin XL
Both are 38 inches wide. The Twin XL is 5 inches longer (80 vs. 75 inches). If the sleeper is about 6 feet tall or still growing, the extra length is worth it. Keep in mind that regular Twin fitted sheets are too short for a Twin XL. Fun fact: two Twin XL mattresses side by side measure 76 × 80 inches—the same as a King.
Twin vs. Full
Both are 75 inches long. The Full is 16 inches wider (54 vs. 38 inches). A Twin saves floor space in kids’ rooms and shared rooms; a Full gives one adult or a teen much more room to move.
Full (Matrimonial) vs. Queen
The Queen is 6 inches wider and 5 inches longer (60 × 80 vs. 54 × 75 inches). For one person a Full is plenty. For couples, the Queen is usually the better fit. Many Spanish-speaking families know the Full as “matrimonial,” but in the U.S. the size most couples choose is the Queen.
Queen vs. King
Both are 80 inches long. The King is 16 inches wider (76 vs. 60 inches). Choose a King if you share the bed with a restless partner, a child or a pet—and if your room has space for it with walking room on both sides.
Mattress size vs. bed frame size
The measurements above are for the mattress only. A bed frame, headboard, footboard and side rails always make the bed bigger than the mattress—sometimes by just a couple of inches, and sometimes by 10 inches or more in length for sleigh beds, storage beds or beds with large headboards.
When you plan your room, use the assembled bed dimensions listed on the bedroom set or bed frame, not just the mattress size.
Height matters too. Your mattress thickness plus the frame or foundation sets how high you sit on the bed. For bunk beds, check the maximum mattress thickness listed for that bunk bed so the guardrail stays high enough.
How much bedroom space do you need?
Plan for at least 24 inches (about 60 cm) of walking space on each side of the bed you use and at the foot. Around 30 to 36 inches (76–91 cm) feels more comfortable. Leave about 36 inches in front of a dresser so the drawers can open fully.
| Mattress size | Suggested minimum room | In meters |
|---|---|---|
| Twin | 7½ × 9 ft | 2.3 × 2.7 m |
| Twin XL | 7½ × 9½ ft | 2.3 × 2.9 m |
| Full | 9 × 9 ft | 2.7 × 2.7 m |
| Queen | 9½ × 9½ ft | 2.9 × 2.9 m |
| King | 11 × 9½ ft | 3.4 × 2.9 m |
Estimates assume 24 inches of walking space on both sides and at the foot, plus a few inches for the frame and headboard. Add about 2 feet of width for each nightstand. A Twin pushed against a wall needs about 2 feet less width.
How to measure before you buy
- Measure the room. Measure wall to wall in both directions. Note where the doors, windows, closet doors, outlets and air vents are.
- Tape out the bed. Use painter’s tape to mark the bed’s footprint on the floor, using the assembled frame size, not just the mattress size.
- Check your walking space. Make sure you have at least 24 inches to walk around the bed and enough room to open doors and dresser drawers.
- Measure the way in. Check doorways, hallways, stairs and tight turns, especially in apartments. King foundations often come in two halves to make delivery easier.
- Bring your numbers. Bring your measurements—or a photo of your taped-out floor—when you shop so we can help you compare.
Frequently asked questions
What is the difference between a Twin and a Full bed?
A Twin mattress is 38 × 75 inches and a Full is 54 × 75 inches. They are the same length, but the Full is 16 inches wider. A Twin is ideal for kids and small rooms, while a Full gives one adult more room to stretch out.
What are the dimensions of a Twin XL mattress?
A Twin XL mattress measures 38 × 80 inches (96.5 × 203.2 cm). It is as wide as a Twin but 5 inches longer, which makes it a good choice for tall teens and adults who sleep alone.
Is a Full bed big enough for two people?
Two adults can sleep on a Full, but it is snug. A Full is 54 inches wide, so each person gets about 27 inches. Most couples are more comfortable on a Queen, which gives each person 30 inches.
What is the difference between a Full and a Queen mattress?
A Full measures 54 × 75 inches and a Queen measures 60 × 80 inches. The Queen is 6 inches wider and 5 inches longer, which makes it the more common choice for couples and taller sleepers.
How much bigger is a King than a Queen?
A King is 76 × 80 inches and a Queen is 60 × 80 inches. They are the same length, but the King is 16 inches wider.
What do two Twin XL mattresses make?
Two Twin XL mattresses placed side by side measure 76 × 80 inches, which is the same size as a standard King.
Is the bed frame bigger than the mattress?
Yes. Bed frames, headboards and footboards add to the overall size, sometimes by 10 inches or more in length. Always check the assembled bed dimensions before you buy.
What size room do I need for a King bed?
With 24 inches of walking space on both sides and at the foot, a King bed fits best in a room that is at least about 11 × 9½ feet. Add about 2 feet of width for each nightstand.
Find your size at Supreme Furniture
We’re a family-owned furniture and mattress store in North Houston at 7521 N Freeway, Houston, TX 77037. If you’d like to try a few sizes before you decide, stop by our showroom—we’re happy to help in English or Spanish.
Questions? Call us at 281-741-2000