What Size Bed Do I Need?

Choosing the right mattress size comes down to three things: your room dimensions, who's sleeping in the bed, and how much space you actually want. This guide cuts through the confusion with clear comparisons and practical recommendations.

02Quick Answer

Not sure where to start? Here's a simple starting point:

  • Solo sleeper, small room: Twin or Full
  • Solo sleeper, regular room: Queen
  • Couple, regular bedroom: Queen
  • Couple who wants more space: King
  • Tall sleeper (6'3"+): California King or Twin XL
  • Kids: Twin or Twin XL

03Mattress Size Chart

Size Width Length Best For
Twin 38" 75" Children, dorms, bunk beds
Twin XL 38" 80" Taller teens, dorm rooms
Full (Double) 54" 75" Solo sleepers, guest rooms
Queen 60" 80" Couples, most bedrooms
King 76" 80" Couples who want more space
California King 72" 84" Tall sleepers, large rooms

04Twin and Twin XL

A twin mattress (38" x 75") is designed for one person — it's the standard for kids' beds, bunk beds, and daybeds. It's narrow and on the shorter side, so most adults will feel cramped.

A Twin XL (38" x 80") adds 5 inches in length, making it popular in college dorms and for taller teens. Width stays the same — still just one person.

Choose twin/twin XL if: You're furnishing a child's room, a bunk bed, or a small dorm room.

05Full (Double)

A full mattress (54" x 75") is 16 inches wider than a twin — better for a solo adult who wants more room to move. Technically sleeps two adults, but it's tight. Each person gets about 27 inches of width, which is less than a twin to themselves.

Full mattresses are shorter than queens (75" vs 80"), which matters for taller sleepers.

Choose full if: You're a solo sleeper in a smaller bedroom, furnishing a guest room, or on a tighter budget. It fits well in rooms as small as 9' x 10'.

06Queen

The queen (60" x 80") is the most popular mattress size in the country. It's 6 inches wider than a full and 5 inches longer — a meaningful upgrade for couples or anyone who moves around in sleep.

Two adults each get about 30 inches of personal space. That's enough for most couples in a standard-size bedroom.

Choose queen if: You're a couple with a bedroom of at least 10' x 10', a solo sleeper who wants extra room, or you want maximum bedding and accessory options (queens have the widest selection).

Browse our queen mattress collection.

07King and California King

A standard King (76" x 80") is like two Twin XL mattresses pushed together. Each person gets 38 inches — as much as a twin to themselves. It's the best option for couples who value personal space, sleep hot, or often have kids or pets in the bed.

The tradeoff: kings require a large bedroom (at least 12' x 12', ideally 13' x 13'+). Bedding costs more, and delivery can be tricky in tight spaces.

A California King (72" x 84") trades 4 inches of width for 4 inches of extra length. Best for tall sleepers (6'3"+). Not ideal for couples who want maximum width.

Choose king if: You have a large bedroom, share the bed with a partner and want more space, or regularly sleep with kids or pets.
Choose California king if: You're taller than 6'3" and want the extra length.

08Minimum Room Size Requirements

Mattress Size Minimum Room Size Comfortable Room Size
Twin 7' x 10' 9' x 10'
Full 9' x 10' 10' x 12'
Queen 10' x 10' 10' x 12'
King 12' x 12' 13' x 13'
California King 12' x 12' 12' x 14'

Always leave at least 24 inches of clearance on the sides of the bed and at the foot for comfortable movement and furniture placement.

Tip: Before shopping, tape out the mattress dimensions on your floor. It's a quick way to see how the bed will actually feel in the room.

09The Right Size for Your Situation

For Couples

A queen works in most standard bedrooms and suits the majority of couples. If you have the space and budget, a king gives each person significantly more room — especially valuable if one partner moves around a lot. Motion-isolating mattresses (memory foam or hybrid) help regardless of size.

For Solo Sleepers

A queen is a comfortable upgrade from a full if your room allows it. The extra length (80" vs 75") matters for anyone over 5'10".

For Taller Sleepers

Go with an 80" length at minimum — that's queen, king, and twin XL. California king (84") is the longest standard option.

For Small Bedrooms

A full is more versatile in tight spaces. Don't force a queen into a room that's too small — it'll feel cramped and make furniture arrangement difficult.

The Elbow Test

When shopping in person, lie down next to your partner with both of you on your backs, hands tucked behind your heads. If your elbows touch, you need a bigger size. If they don't, you've found a comfortable fit.

You can try this test at any of our LA Mattress Store locations. Our team can help you find the right size and the right mattress for how you actually sleep.

10Frequently Asked Questions

Queen is the most popular size in the U.S., followed by king. Queens fit the majority of bedrooms and sleep two comfortably.

Is a queen or king better for couples?

A queen works well for most couples. A king is better if you want more personal space, sleep with kids or pets, or have a large bedroom. Each person gets 38" on a king vs. 30" on a queen.

Can a full mattress fit two adults?

Technically yes, but it's tight — about 27" per person. Most couples prefer at least a queen for comfortable co-sleeping.

What's the difference between king and California king?

A standard king is wider (76" vs 72") but shorter (80" vs 84"). California king is better for tall sleepers; standard king is better for couples who want more width.

What size mattress fits a 10x10 room?

A queen is the largest size that fits comfortably in a 10' x 10' room, assuming minimal other furniture. A full leaves more breathing room in that space.

Do I need to measure my room before buying a mattress?

Yes. Measure the room, note where doors open, and account for other furniture. Leave at least 2 feet of clearance on each side of the bed for comfortable movement.