Mattress Size Guide: How to Choose the Right Size for Your Bedroom

01Mattress Size Guide: How to Choose the Right Size for Your Bedroom

Picking the wrong mattress size is one of the most common — and most expensive — mistakes people make when buying a new bed. Too small and you'll feel cramped every night. Too large and it might not fit your room, your door frames, or your budget.

This guide covers every standard mattress size: exact dimensions, who each size works best for, and how to make the decision confidently.

03Mattress Size Chart

04Twin & Twin XL

The Twin (38" × 75") is the smallest standard mattress size. It's designed for a single sleeper and works well in children's rooms, bunk beds, and very small spaces. Most adults find it cramped for nightly use.

The Twin XL (38" × 80") adds 5 inches of length — making it the same length as a Queen or King. It's the standard size for college dorm rooms and a good choice for taller teenagers or solo adult sleepers who are working with limited square footage. Width is still narrow (38"), so it's a single-sleeper mattress.

Best for: Children, bunk beds, college dorms, studio apartments with tight space constraints.
Not ideal for: Couples or adult solo sleepers who move around at night.

Browse Twin mattresses at LA Mattress Store.

05Full (Double)

The Full (54" × 75") is 16 inches wider than a Twin — enough for a single adult to sleep comfortably. For a couple, it's tight: each person has roughly 27 inches of width, which is less space than a toddler's crib.

Full mattresses are a solid choice for a single adult's master bedroom, a guest room, or a teenager's room. They're generally more affordable than Queen, and bedding is widely available.

Best for: Solo adults, guest rooms, teenagers, smaller bedrooms.
Not ideal for: Couples who want to sleep without disturbing each other, or taller people (at 75" length, anyone over about 6'2" will be cramped).

Browse Full mattresses at LA Mattress Store.

06Queen

The Queen (60" × 80") is the most popular mattress size in the U.S. — and for good reason. It gives couples a workable amount of space (30" each), fits comfortably in most bedrooms, and offers a wide selection of models across every price range and comfort type.

For solo sleepers, a Queen offers noticeably more room than a Full without requiring the space or budget of a King. If you're unsure what size to get and don't have a strong reason to go larger, Queen is usually the right call.

Best for: Couples in standard bedrooms, solo sleepers who want room to spread out.
Not ideal for: Very tall people (over 6'3" may prefer a Cal King), couples who both move a lot at night and want more separation.

Browse Queen mattresses at LA Mattress Store.

07King

The King (76" × 80") gives each person in a couple as much width as a Twin XL — 38" each. If you've ever shared a Queen with a restless sleeper or a dog that takes up more room than they should, you understand the appeal.

The tradeoff is practical: Kings are heavy (often 100–150+ lbs), harder to move through doorways and up stairs, and require a larger bedroom to feel balanced. Bedding, frames, and accessories are also more expensive.

Best for: Couples who want maximum personal space, families who share a bed with kids or pets, master bedrooms with ample square footage.
Not ideal for: Smaller rooms, apartments with narrow stairwells or hallways, buyers with limited budgets for ongoing bedding costs.

Browse King mattresses at LA Mattress Store.

08California King

The California King (72" × 84") is the longest standard mattress made. It trades 4 inches of width compared to a standard King to add 4 inches of length — making it the best option for couples where one or both people are tall (6'2" or over).

If you're under 6'2" and choosing between a King and Cal King, go with the standard King — you'll have more width and equivalent length for your height.

Best for: Taller sleepers (6'2"+), couples who prioritize legroom over shoulder room.
Not ideal for: Average-height sleepers who want maximum width, smaller rooms.

Browse California King mattresses at LA Mattress Store.

09How to Choose the Right Mattress Size

Step 1: Measure your bedroom

Leave at least 24–30 inches of walkable space on the sides and foot of the bed. A King mattress in a 10×10 room doesn't leave room to move around — which makes the room feel cramped and makes the bed harder to make.

Step 2: Check your doorways and stairs

King and California King mattresses can be difficult to maneuver through standard doorways and around tight corners. Measure before you buy, or ask about delivery options. (LA Mattress Store offers white glove delivery and installation — our team handles the logistics.)

Step 3: Think about who's sleeping in the bed

• Solo sleeper: Full or Queen is usually enough. Twin XL if space is very limited.
• Couple: Queen minimum. King if you want more space or either of you is a restless sleeper.
• Couple + pets or kids who join you: King is worth the investment.
• Tall sleeper (6'2"+): Twin XL, Queen, King, or California King — any standard size except Twin or Full.

Step 4: Consider your budget — total cost, not just mattress price

A larger mattress means more expensive: sheets, mattress protectors, bed frames, and toppers are all priced by size. A King setup costs meaningfully more over time than a Queen, even if the mattresses themselves are close in price.

Step 5: Test before you buy

The best way to know if a mattress size feels right is to lie on it. At LA Mattress Store, you can try every size at our showrooms — lying down the way you actually sleep, for as long as you need to.

10Minimum Room Size Recommendations

11Ready to Find the Right Size?

LA Mattress Store has five showrooms across Los Angeles. Come in and test every size you're considering — we'll help you narrow it down based on your room dimensions, sleep style, and budget, without pressure.

Browse all mattresses, explore mattress types, or find a location near you. We offer financing options and a 120-night comfort guarantee on every purchase.

12Frequently Asked Questions

What's the most popular mattress size?

Queen is the most popular mattress size in the U.S. It balances space, price, and room compatibility well for most sleepers — both couples and solo adults.

What's the difference between a King and California King?

A standard King is 76" × 80" — wider but the same length as a Queen. A California King is 72" × 84" — 4 inches narrower but 4 inches longer. Cal King is better for tall people; standard King is better if you want maximum width.

Is a Queen big enough for two people?

For most couples, yes — a Queen provides 30 inches of width per person, which is workable for nightly sleep. If one or both partners are larger, very restless, or want more separation, a King is worth considering.

Can a King mattress fit in a standard bedroom?

It depends on the room. A King mattress needs at least a 12×12 foot room to leave adequate space around the bed. Measure your room and check doorways, hallways, and stairwells before purchasing.

Do Twin XL and Full have the same length?

No. A standard Full is 75" long. A Twin XL is 80" long — the same length as a Queen or King. For a taller solo sleeper trying to decide between Twin XL and Full, the Full offers more width; the Twin XL offers more length.

What size mattress is best for a guest room?

A Full or Queen works well for most guest rooms. A Full is more space-efficient; a Queen will be more comfortable for guests who are couples. Consider how often the room is used and by whom before deciding.