A little more room. A better fit.
Mattress size is one of the most practical decisions in the buying process, and one of the most overlooked. Pick too small and you'll feel cramped. Pick too large and the mattress dominates the room. Get it right and you barely think about it at all.
This guide covers every standard mattress size, who each one is best for, what room dimensions you'll need, and what to consider before buying.
Twin XL or Full
Choose extra length for a taller sleeper, or extra width to spread out.
Explore solo sizes 02 / For twoStart with Queen
Compare its 60-inch width with your current bed and available floor space.
Explore Queen 03 / For more roomKing or California King
King gives you more width. California King adds length for taller sleepers.
Compare the larger sizesSee the size difference
All dimensions are width × length. These are nominal US sizes; check the exact mattress and frame specifications before ordering.
Which two sizes are you deciding between?
Choose a pair to see the difference at the same scale.
These are mattress dimensions. Your bed frame, open drawers and walking space need extra room.
See every size at a glance
Dimensions, room starting points and who each size suits
Scroll across the chart on smaller screens.
| Size | Dimensions (inches) | Room starting point: | Best For |
|---|---|---|---|
| Twin | 38 × 75 | 7 × 10 ft | Kids, single sleepers |
| Twin XL | 38 × 80 | 8 × 10 ft | Tall single adults, dorms |
| Full | 54 × 75 | 10 × 10 ft | Single adults, guest rooms |
| Full XL | 54 × 80 | 10 × 10 ft | Tall single adults |
| Queen | 60 × 80 | 10 × 11 ft | Couples, most bedrooms |
| King | 76 × 80 | 12 × 12 ft | Couples, spacious rooms |
| California King | 72 × 84 | 12 × 12 ft | Tall sleepers, narrow rooms |
Room sizes are starting points. Allow for your frame, furniture and comfortable walking space. Check your layout.
Explore each mattress size
Open a size for the benefits, trade-offs and room guidance.
Twin Mattress, 38" × 75"
Children, single sleepers in small rooms, bunk beds, daybeds.
The twin is the smallest standard mattress size. At 38 inches wide, it gives one person a comfortable sleeping space without taking over a room. Twin mattresses are widely available and among the most affordable options. Perfect for kids' rooms and small guest spaces.
Room starting point: 7 × 10 ft
Twin XL Mattress, 38" × 80"
Taller teenagers and adults, college dorm rooms, single sleepers who need extra length.
Same width as a twin, but 5 inches longer. That extra length makes a real difference for adults over 6 feet tall. Twin XL is the standard size in most college dormitories. Bedding is slightly harder to find than standard twin, but widely available online.
Room starting point: 8 × 10 ft
Full Mattress, 54" × 75"
Single adults who want more sleeping width, young couples in smaller spaces, guest rooms.
A full mattress (also called a double) is 16 inches wider than a twin, enough for one adult to sleep comfortably with some room to move. It can fit two adults, but it's tight. For couples who want shared space, a queen is a better long-term choice. Full mattresses suit single adults or guest rooms where space is limited.
Room starting point: 10 × 10 ft
Full XL Mattress, 54" × 80"
Taller single adults who want more width than a twin XL but don't need a queen.
The Full XL offers the same extra length as a Twin XL but with the wider profile of a full. It's a niche size, genuinely useful for tall adults sleeping alone who have limited bedroom width. Bedding can be harder to find. Worth considering if the dimensions are right for your room and your height.
Room starting point: 10 × 10 ft
Queen Mattress, 60" × 80"
Couples, single adults who want space, and anyone with a standard-sized master bedroom.
At 60 × 80 inches, a Queen gives two people 30 inches of width each if the space is divided evenly. Compare it with your current mattress, try it together and measure the frame in your room. A King adds 16 inches of total width without adding length; a Full saves space but is narrower and shorter.
Room starting point: 10 × 11 ft
King Mattress, 76" × 80"
Couples who want maximum sleeping space, sleepers with children or pets in the bed, large master bedrooms.
A King gives two people 38 inches of width each if divided evenly, the same width per person as a Twin XL. It is 16 inches wider than a Queen and the same 80 inches long. Check your actual frame, walking routes and delivery access. More width does not eliminate movement transfer; mattress construction matters too.
Room starting point: 12 × 12 ft
California King Mattress, 72" × 84"
Tall sleepers (6'2" or taller), couples where one or both partners are tall, long narrow rooms.
The California King is 4 inches narrower but 4 inches longer than a standard king. It's the right choice for tall sleepers who regularly feel their feet hanging off the end of a standard king. It's also well-suited to long, narrower master bedrooms where a wider king wouldn't fit as well. Bedding selection is more limited than standard king.
Room starting point: 12 × 12 ft
Custom Sizes
RV, antique frames and other unusual spaces.
Best for: Unusual room shapes, antique or custom bed frames, RV beds, and specialty applications.
If none of the standard sizes work for your situation, custom mattress sizing is available through specialty manufacturers. RV sizes (RV queen, RV king, RV short queen) are a common custom category. Measure your available space precisely before ordering.
Who will be sleeping here?
Start with the people using the bed, then check the room. If you share a bed, compare sizes together.
For Solo Sleepers
- Small room or children's room: Twin or Twin XL
- Average adult bedroom: Full or Queen
- Want to spread out: Queen. You'll thank yourself later
- Very tall (6'2"+): Twin XL, Full XL, or California King
For Couples
- Tight budget or smaller room: Full (workable, but cozy)
- Standard master bedroom: Queen, the most practical choice
- Large room, want space: King
- One or both partners are tall: California King
- Want independent adjustability: Split King with adjustable base
For Families
If children or pets regularly join you in bed, step up one size from what you'd normally choose. A couple that would be fine in a queen might want a king once kids start appearing at 2 AM.
Check the whole room
Room size matters beyond just fitting the mattress. You want:
- At least 18–24 inches of clearance on each side of the bed (for getting in and out easily)
- Clearance at the foot of the bed for dressers, TVs, or walking space
- Room for nightstands on each side
A Queen leaves more walking space than a King in the same room. The room sizes in this guide are planning starting points, not guarantees of fit: your bed frame, furniture, door swings and access needs determine what works.
A Practical Rule of Thumb
Measure the outside of the bed frame, not just the mattress. Mark that footprint on the floor with tape. Then measure the remaining space on each side and at the foot separately, allowing for doors, open drawers and your usual walking routes.
If you're visiting one of our LA showrooms, bring your room measurements. Our team can help you visualize how each size will work in your specific space.
Confirm the size before ordering. Review the exchange information and Love Your Bed Guarantee terms for eligibility, the optional pickup and redelivery cost and exclusions.
Before you order
- Check the frame.Confirm the mattress size and the frame’s outside dimensions. King and California King need different frames and bedding.
- Open every door and drawer.Measure their full reach, including under-bed storage, closet doors and the bedroom door.
- Measure the delivery route.Check doorways, stair turns and elevator dimensions. Ask the showroom about access before choosing a large one-piece mattress.
- Include the extras in your budget.Price the matching foundation or base, protector and sheets alongside the mattress.
Need dimensions in feet or centimeters?
Open the full conversion chart
Quick reference for all standard US mattress sizes and bed sizes, useful when you're cross-referencing bedding, bed frames, or international measurements.
| Mattress size | Inches | Feet | Centimeters |
|---|---|---|---|
| Twin / Single | 38" × 75" | 3'2" × 6'3" | 97 × 191 cm |
| Twin XL | 38" × 80" | 3'2" × 6'8" | 97 × 203 cm |
| Full / Double | 54" × 75" | 4'6" × 6'3" | 137 × 191 cm |
| Full XL | 54" × 80" | 4'6" × 6'8" | 137 × 203 cm |
| Queen | 60" × 80" | 5'0" × 6'8" | 152 × 203 cm |
| King (Eastern King) | 76" × 80" | 6'4" × 6'8" | 193 × 203 cm |
| California King (Western King) | 72" × 84" | 6'0" × 7'0" | 183 × 213 cm |
These are common US mattress dimensions. King offers the most width among these sizes, while California King offers the most length. Full XL and RV sizes may have fewer mattress and bedding options; confirm the exact dimensions before buying.
For a visual side-by-side and printable bed size comparison chart, see our mattress sizes overview. For specific size pages, jump to Twin, Full, Queen, King, or California King collections.
Common size questions
Which mattress size is best for a couple?
Compare Queen and King together. Queen is 60 × 80 inches; King is 76 × 80 inches, giving each person 8 more inches of width when divided evenly. California King is 72 × 84 inches for extra length. Choose the space you both find comfortable after allowing for the actual frame and bedroom layout.
What's the most popular mattress size?
Queen, at 60 × 80 inches. It works for most bedrooms, accommodates couples and single adults alike, and is more affordable than king.
King vs. California King, which should I choose?
Standard king (76" × 80") is wider. California King (72" × 84") is longer. If you or your partner are over 6'2", go California King. If you want maximum width and have a wide room, go standard king.
What is a split king mattress?
A split king is two twin XL mattresses placed side by side in a king-size frame. It's popular for couples using adjustable bed bases who want independent control of each side, different firmness, different incline. A practical solution for partners with different sleep needs.
Can a queen mattress fit in a full-size frame?
No. A queen (60" wide) is 6 inches wider than a full (54" wide). They require different frames and bedding.
What size mattress fits in a dorm room?
Most college dorm rooms use twin XL mattresses (38" × 80"). Confirm with your specific institution before purchasing, as some older dorms still use standard twin.
How do I buy an RV mattress?
Measure the available space in your RV precisely. RV beds often have non-standard dimensions. Common options include RV queen (60" × 75"), RV king (72" × 75"), and RV short queen (60" × 74"). Custom sizing may be needed for older models.
Does mattress size affect sleep quality?
More space can make it easier to turn and find a comfortable position, especially when sharing. It does not guarantee better sleep or remove movement transfer, which also depends on the mattress construction. Try your shortlisted size with your partner and compare it with the space you have now.
