Mattress Sizes Guide

Here are all standard US mattress sizes:

• Twin: 38" × 75" (96.5 cm × 190.5 cm) — Best for children, teens, and small rooms. Shop Twin mattresses →
• Twin XL: 38" × 80" (96.5 cm × 203 cm) — Same width as Twin but 5" longer. Standard in college dorms. Good for taller teens and adults in small spaces.
• Full (Double): 54" × 75" (137 cm × 190.5 cm) — Fits one adult comfortably. Tight for two. Popular for guest rooms and single adults in apartments. Shop Full mattresses →
• Queen: 60" × 80" (152.5 cm × 203 cm) — The most popular size. Fits most couples. Requires a room at least 10' × 10'. Shop Queen mattresses →
• King: 76" × 80" (193 cm × 203 cm) — Maximum width for couples. Each person gets 38" — the same as a Twin. Needs a room at least 12' × 12'. Shop King mattresses →
• California King: 72" × 84" (183 cm × 213 cm) — 4" narrower but 4" longer than King. Best for sleepers over 6'2". Shop Cal King mattresses →

Pro tip: If you're between sizes, go larger. A Queen costs only $100-200 more than a Full, but you get 6 more inches of width — a meaningful difference for comfort.

Your bedroom dimensions determine the largest mattress you can comfortably fit. You need at least 2-3 feet of clearance on each accessible side of the bed, plus walking space to the door and dresser.

• 8' × 10' room: Twin or Full maximum. A Queen technically fits but leaves no room for furniture.
• 10' × 10' room: Queen fits well with room for two nightstands and a dresser.
• 10' × 12' room: Queen with ample space, or King with minimal furniture.
• 12' × 12' room or larger: King or Cal King with full furniture setup.

Measure first. Before you buy, measure your bedroom and map out where the bed, nightstands, and dresser will go. A mattress that's too large for the room makes the space feel cramped and hard to navigate.

When visiting our LA showrooms, bring your room measurements — our consultants can help you visualize the right fit.

This is the most common size question couples ask:

Queen (60" × 80") gives each partner 30 inches of width — workable for most couples, especially if you sleep close together. It's the standard choice when room size or budget is a consideration. A Queen fits in most bedrooms and costs less than King across all brands.

King (76" × 80") gives each partner 38 inches — the same as their own Twin bed. Significantly more room to spread out, less disturbance from a restless partner, and more comfortable for side sleepers who need space. The upgrade is especially worth it if:

• Either partner is a side sleeper (takes up more width)
• Either partner moves a lot during sleep
• You have kids or pets who join you
• Either partner is over 200 lbs or tall

Split King is two Twin XL mattresses side by side (76" × 80" total). Allows each partner to choose their own firmness. Works with adjustable bases so each side can elevate independently.

See our full couples mattress guide →

Both are premium sizes, but they serve different needs:

King (76" × 80"): Wider but shorter. Better for couples who want maximum side-to-side space. Most popular large size. More sheet and bedding options available.

Cal King (72" × 84"): Narrower but 4 inches longer. Designed for taller sleepers — if you're 6'2" or taller, the extra length prevents your feet from hanging off the edge. Also fits better in long, narrow bedrooms.

Key differences:

• Total area: King has 6,080 sq inches; Cal King has 6,048 sq inches — King is actually slightly larger overall
• Bedding: King sheets and bedding are more widely available and sometimes cheaper
• Foundations: Both use two-piece foundations for easy delivery through doorways

Our recommendation: Choose King unless you're over 6'2" or have a long narrow room. Both sizes are available across all brands in our LA stores.

The only difference is length: Twin is 75" long, Twin XL is 80" long (5 extra inches). Both are 38" wide.

Choose Twin if: The sleeper is a child or teen under 5'6". The shorter length fits smaller rooms better and Twin bedding is cheaper and more widely available. Shop Twin →

Choose Twin XL if: The sleeper is a teen or adult over 5'6", or if you might want to combine two into a Split King later. Twin XL is the standard size in college dorms. Twin XL is also the size used for split king adjustable bases.

Price difference: Typically $50-100 between Twin and Twin XL for the same model — minimal for the extra 5 inches of length.