What Size Mattress Should I Get? A Room-by-Room Guide

01What Size Mattress Should I Get? A Room-by-Room Guide

Choosing the right mattress size isn't just about how much room you have — it's about who's sleeping on it, how the room is used, and what trade-offs you're willing to make. This guide walks through every size option, who it's best for, and how to figure out what actually fits in your space.

03Mattress Size Chart

04How to Choose the Right Size

Before measuring anything, answer these three questions:

1. Who's sleeping on this mattress? One adult, two adults, kids, or co-sleeping with children?
2. How tall are the sleepers? Anyone over 6'1" should look at King, Twin XL, or California King.
3. What's your room size? Bigger isn't always better — a King in a 10×10 room leaves almost no walkable space.

Then measure. You'll need: your room's length and width, the location of windows and doors, and where you plan to put other furniture (nightstands, dresser, desk).

05How Much Room Do You Need Around the Bed?

A common mistake is focusing only on whether the mattress fits — not whether the room feels livable around it.

Recommended clearance:

• Each side of the bed: At least 24" (2 feet) for comfortable movement. 18" is the minimum if space is tight.
• Foot of the bed: At least 24–30" if there's a dresser or TV; 18" minimum for door clearance.
• One side can be against the wall if it's a single sleeper or a child's room — but make the bed every day a little harder.

Room size as a rough guide:

Pro tip: Use painter's tape on the floor to outline the mattress dimensions before buying. Lie down in it, walk around it, open your closet door. This simple test prevents expensive surprises.

06Each Size Explained

Twin (38" × 74")

The classic children's mattress and bunk bed standard. Fine for kids up to about 12; adults will feel cramped. At 74" long, taller teenagers are already outgrowing it by high school. Good for guest rooms where floor space matters more than sleep comfort. Shop twin mattresses →

Twin XL (38" × 80")

Same width as a Twin, but 6" longer. The standard for college dorms and a smart choice for teens who are still growing. Two Twin XLs pushed together equal the width of a King — a popular solution for adjustable bed setups where partners want separate firmness levels.

Full / Double (54" × 75")

18" wider than a Twin, but only 75" long — shorter than a Queen. Works well for single adults in smaller apartments or guest rooms. Not ideal for couples; the 54" width gives each person only 27" of space (less than a Twin XL). Shop full mattresses →

Queen (60" × 80")

The most popular size in the US, and for good reason. It fits comfortably in most standard bedrooms, works for most couples, and gives single sleepers plenty of room to spread out. If you're unsure what size to get, a Queen is almost always the right default. Shop queen mattresses →

King (76" × 80")

The widest standard mattress. Gives couples significantly more personal space — each person gets 38", equal to a Twin. Great for restless sleepers, people with kids who come into bed, or anyone who just likes room to move. Requires a larger bedroom to not feel cramped. Shop king mattresses →

California King (72" × 84")

Narrower than a standard King by 4", but 4" longer. The right choice for taller sleepers (6'2"+) who need the extra foot length. Not as wide as a King, which some couples find less ideal. If you're tall but not couples, this is the size worth considering. Shop California king mattresses →

07Choosing a Size as a Couple

For couples, mattress size affects sleep quality in ways beyond just physical space. Motion transfer, temperature, and firmness preferences all become more relevant with two people sharing a bed.

If you and your partner have very different firmness preferences, two Twin XLs on a split adjustable base can solve the problem entirely. Each person controls their own side.

08Small Space Solutions

Tight on space but don't want to compromise mattress size? Here are practical ways to reclaim floor space:

• Use a platform bed with built-in storage drawers. Eliminates the need for a dresser and makes a larger mattress viable in a smaller room.
• Replace nightstands with wall-mounted shelves. Saves 12–18" on each side.
• Use vertical storage. Tall bookshelves and over-door organizers keep floor space clear.
• Go doorless. If a bedroom door opens into the room and limits furniture placement, a curtain or barn door that slides can free up significant usable floor space.
• Choose a low-profile bed frame. Visually opens up a small room by lowering the bed height.

In LA, where many apartments have compact bedrooms, small space solutions like these are practical and worth the time to plan. Our in-store team at any LA Mattress Store location can help you think through room layout alongside mattress selection.

09Frequently Asked Questions

Is a Queen big enough for two people?

For most couples, yes. A Queen gives each person 30" of space — not luxurious, but workable. If you or your partner is a restless sleeper, or you both value personal space, a King is worth the upgrade.

What's the difference between King and California King?

A standard King is 76" × 80". A California King is 72" × 84" — 4" narrower but 4" longer. California King is the better choice for tall sleepers (6'2"+). For everyone else, a standard King gives more width per person.

Can I fit a King in a 12×12 room?

Technically yes, but it will feel cramped. A King mattress is 76" wide and 80" long — in a 12×12 room (144" square), you'd have limited space on the sides and foot. If 12×12 is your only option, consider a Queen or plan to minimize other furniture.

Should I buy the biggest mattress I can fit?

Not necessarily. A too-big mattress in a too-small room feels worse than a well-sized mattress in a room with comfortable clearance. Use the painter's tape test before deciding.

What mattress size is best for a guest room?

A Queen is the most guest-friendly — fits couples and singles comfortably. If your guest room is small, a Full is the next best option. For occasional guests only, a daybed with a trundle or a high-quality sofa bed can work.

---

Still unsure which size is right for you? Come in and see the options in person. Our team at LA Mattress Store can help you match size, firmness, and budget — and there's no pressure to buy on the spot. If you already know what size you want, explore our full mattress collection or use our flexible financing options to make the upgrade easier.