Mattress Dimensions & Size Guide
Mattress Size & Dimensions Guide
Choosing the right mattress size is just as important as choosing the right type. This guide covers every standard mattress size with exact dimensions, recommended room sizes, and who each size fits best.
Size at a Glance
How mattress widths compare — from the compact twin to the spacious king.
Detailed Size Breakdown
Everything you need to know about each mattress size.
TWIN
Twin Mattress
38" W × 75" L (96.5 cm × 190.5 cm)
The smallest standard adult mattress. Twin beds are the go-to for children's rooms, bunk beds, daybeds, and tight spaces. At 38 inches wide, they comfortably sleep one child or smaller adult.
Surface Area: 2,850 sq in
Min Room Size: 7' × 10'
Weight Capacity: ~250 lbs
Best For: Kids, bunk beds, small rooms
TWIN
XL
XL
Twin XL Mattress
38" W × 80" L (96.5 cm × 203 cm)
Same width as a twin but 5 inches longer — matching the length of a queen or king. The standard size for college dorms and the building block for split king setups on adjustable bases. Great for taller teens and adults who don't need the extra width. Browse every Twin XL mattress we stock in hybrid, foam, and innerspring builds.
Surface Area: 3,040 sq in
Min Room Size: 7' × 10'
Weight Capacity: ~300 lbs
Best For: Tall sleepers, dorms, adjustable bases
FULL
Full / Double Mattress
54" W × 75" L (137 cm × 190.5 cm)
Also known as a "double," the full mattress is 16 inches wider than a twin. It gives solo sleepers room to spread out and can technically fit two adults — though it's tight at only 27 inches per person. A popular choice for teens, studio apartments, and guest bedrooms.
Surface Area: 4,050 sq in
Min Room Size: 9' × 10'
Weight Capacity: ~450 lbs
Best For: Solo adults, teens, guest rooms
QUEEN
Queen Mattress
60" W × 80" L (152.5 cm × 203 cm)
The most popular mattress size in the U.S. — and for good reason. At 60 inches wide, queens give each partner 30 inches of personal space (the same as a twin). They fit comfortably in most master bedrooms and are widely available in every mattress type and price range.
Surface Area: 4,800 sq in
Min Room Size: 10' × 10'
Weight Capacity: ~500 lbs
Best For: Couples, most bedrooms
KING
King Mattress
76" W × 80" L (193 cm × 203 cm)
The king mattress is 16 inches wider than a queen, giving each partner a full 38 inches of space — equivalent to their own twin bed. Perfect for couples who want room to sleep without disturbing each other, and for families with kids or pets who share the bed.
Surface Area: 6,080 sq in
Min Room Size: 12' × 10'
Weight Capacity: ~500 lbs
Best For: Couples, families, large rooms
CAL
KING
KING
California King Mattress
72" W × 84" L (183 cm × 213 cm)
The California King trades 4 inches of width for 4 inches of extra length compared to a standard king — making it the longest mattress you can buy. Designed for taller sleepers (6'2" and above) and narrower master bedrooms where a standard king might not fit. Despite the name, it's actually smaller in total surface area than a regular king.
Surface Area: 6,048 sq in
Min Room Size: 12' × 10'
Weight Capacity: ~500 lbs
Best For: Tall sleepers, narrow rooms
SPLIT
KING
KING
Split King Mattress
76" W × 80" L — Two 38" × 80" pieces
A split king uses two Twin XL mattresses placed side by side on a king-size frame. The main advantage: each side can be a completely different mattress. Pair them with a split king adjustable base and each partner controls their own head and foot elevation independently. The ultimate setup for couples with different sleep preferences.
Surface Area: 6,080 sq in (total)
Min Room Size: 12' × 10'
Weight Capacity: ~300 lbs per side
Best For: Adjustable bases, different firmness
Quick Comparison
| Size | Width | Length | Area (sq in) | Room Size | Price Range |
|---|---|---|---|---|---|
| Twin | 38" | 75" | 2,850 | 7' × 10' | $ |
| Twin XL | 38" | 80" | 3,040 | 7' × 10' | $ |
| Full | 54" | 75" | 4,050 | 9' × 10' | $$ |
| Queen ★ | 60" | 80" | 4,800 | 10' × 10' | $$ |
| King | 76" | 80" | 6,080 | 12' × 10' | $$$ |
| Cal King | 72" | 84" | 6,048 | 12' × 10' | $$$ |
| Split King | 76" (2×38") | 80" | 6,080 | 12' × 10' | $$$$ |
Common Questions
Quick answers to the most common mattress size questions.
What's the difference between a king and California king?
A standard king is 76" wide × 80" long. A California king is 72" wide × 84" long. The Cal King is 4 inches narrower but 4 inches longer. Choose a Cal King if you're over 6'2" or have a longer, narrower bedroom. A standard king gives you more total surface area.
Is a full the same as a double?
Yes — "full" and "double" are two names for the same size mattress (54" × 75"). The term "double" is older and less commonly used today, but they're identical in dimensions.
Can two people sleep on a full mattress?
Technically yes, but it's tight. A full mattress gives each person only 27 inches of width — less than a twin bed (38"). It works for occasional use, but most couples will be more comfortable on a queen (30" each) or king (38" each).
What size mattress fits in a 10×10 room?
A queen (60" × 80") fits comfortably in a 10' × 10' room, leaving space for nightstands and walking room. A king can physically fit, but the room will feel cramped — kings really need a 12' × 10' minimum.
Do I need special sheets for a Twin XL?
Yes. Twin XL sheets are 5 inches longer than standard twin sheets. Using regular twin sheets on a Twin XL mattress will leave the bottom exposed. Always check that sheets are labeled "Twin XL" specifically.
What's the point of a split king?
A split king gives each partner independent control. You can choose different firmness levels on each side, and when paired with a split king adjustable base, each person can raise or lower their head and feet independently. It's the most customizable sleep setup available.
Are California King sheets hard to find?
Not at all. California King is a standard size, and sheets are widely available from most bedding brands. We carry Cal King sheets from multiple brands — just make sure to select "California King" specifically, as they won't fit a standard king.
What mattress size is best for couples?
Queen is the most popular and works great for most couples. If budget and room size allow, a king gives each partner the equivalent of their own twin bed. For couples with very different sleep preferences, a split king with an adjustable base is the ultimate setup.
Shop Mattresses by Size
Found your size? Jump straight to the collection: Twin, Twin XL mattresses, Full, Queen, King, California King, or Split King. Every mattress ships with free delivery & setup in the LA area and a 120-night sleep trial.
Mattress Size FAQs
What size is a twin mattress in feet?
A twin is 38" x 75" — just over 3 feet wide and 6 feet 3 inches long.
What are full-size mattress dimensions in inches?
A full (double) mattress measures 54 inches wide by 75 inches long. A "Full XL" adds 5 inches of length at 54" x 80".
What is a "single" mattress size?
"Single" is another name for a twin: 38" x 75". Some brands label the same size either way.
Is a queen big enough for two adults?
Yes — at 60" x 80" a queen gives each person about 30 inches of width. Couples who want more personal space should look at a king (38 inches each).
What's the biggest standard mattress size?
By area, a standard king (76" x 80"); by length, a California king (72" x 84"). A split king matches a king's footprint using two Twin XL mattresses.
Do all my sheets need to match the mattress size exactly?
Fitted sheets, yes — length and depth matter. Flat sheets and comforters are more forgiving. Find size-specific bedding in our sheet collections.