Mattress Size Chart Guide: 2026

Mattress sizing sounds simple until you actually need to buy one — then the difference between "queen" and "California king," or "twin" and "twin XL," suddenly matters a great deal for your room, your budget, and whether your new mattress fits through the doorway.

This guide covers exact dimensions for every standard mattress size sold in the US, how to match a size to your room and body, and the non-standard sizes — Short Queen, RV King, split king — that trip up buyers who assume every "queen" or "king" is identical.

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Complete Mattress Size Chart

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Standard Sizes Explained

Twin (38" × 75")

The smallest standard mattress size, designed for a single sleeper. Common in children's bedrooms, bunk beds, and guest rooms with limited space. If you are furnishing a child's first bed or a bunk bed frame, twin is almost always the correct size — most bunk bed frames are built specifically to twin dimensions.

Reviewed picks in this size: EGOHOME 6 Inch Twin Kids Mattress ($94–$118), Zinus 6 Inch Twin Green Tea ($99–$139), Linenspa 8 Inch Hybrid ($129–$149), Novilla 6 Inch Twin Gel Foam ($69–$99), Nectar Classic Twin ($339–$359) for older teens who want full-depth memory foam rather than a kids'-specific profile.

Twin XL (38" × 80")

Identical width to a standard twin, but 5 inches longer — the extra length matters for anyone over 6 feet tall who would otherwise have their feet hang off a standard twin. Twin XL is also the standard size for most college dormitory beds, and it is the building block for a split king setup (two Twin XLs pushed together).

Reviewed pick in this size: Helix Plus Elite Twin XL ($2,099–$2,299) — a reinforced hybrid built with a high-gauge coil base specifically engineered for heavier solo sleepers who need Twin XL's extra length.

Full / Double (54" × 75")

15 inches wider than a twin but the same length. A reasonable choice for a solo sleeper who wants more shoulder and rolling room than a twin provides, or for a smaller guest room where a queen would not comfortably fit. Full is not recommended for two adults sharing a bed long-term — at 54 inches wide, each person gets only 27 inches of width, narrower than a standard twin per person.

Reviewed pick in this size: Leesa Original Hybrid 11" ($1,062–$1,082) — a medium-firm hybrid with strong edge support and cooling, well suited to a solo sleeper furnishing a guest room or smaller bedroom.

Queen (60" × 80")

The most popular mattress size sold in the US, and the default recommendation for most couples and solo sleepers who want extra space. At 60 inches wide, two adults get 30 inches each — comparable to a twin mattress per person, which is workable for most couples though not spacious. Queen is also the size most bedroom furniture (frames, headboards, bedding) is designed around by default, which usually makes it the easiest size to shop for.

Reviewed picks in this size: the majority of mattresses on this site are tested in queen — see our full reviews index for the complete list.

King / Eastern King (76" × 80")

16 inches wider than a queen, giving each partner in a shared bed roughly 38 inches of width — closer to a full mattress's width per person. King is the clear upgrade for couples who feel cramped on a queen, but it requires a genuinely large bedroom; as a rough guideline, allow at least 12 × 12 feet of room to comfortably fit a king bed with walking space on both sides.

Reviewed picks in this size: Nectar Classic King ($879–$899) — our testing confirmed consistent foam density across the full 76-inch width, a common weak point in lower-quality king mattresses. For a budget hybrid alternative, the Signature Design by Ashley 12" Hybrid King ($435–$475) delivers real individually wrapped coil construction at less than half the price.

California King (72" × 84")

Four inches narrower than a standard king but four inches longer — 84 inches total length. This size specifically suits taller sleepers (comfortably fitting sleepers up to 6'8" or so) and rooms that are narrow but have more available length. California King is a less common size, which means fewer sheet and bedding options are available compared to standard king.

Split King (Two 38" × 80" Twin XLs)

Not a single mattress, but two Twin XL mattresses placed side by side to form a king-sized sleep surface. This setup is specifically for couples using an adjustable base, since each side can be raised or lowered independently — a genuine functional advantage a single king mattress cannot offer. The trade-off is a visible seam down the middle and the need for split-king-specific bedding. See our Best Adjustable Bed Base guide for a full breakdown of how Split King setups work.

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Non-Standard Sizes: Short Queen and RV King

RVs, campers, fifth-wheels, and boats frequently use non-standard sizing built around vehicle floor plans rather than bedroom convention.

Short Queen (60" × 75"): Same width as a standard queen, but 5 inches shorter. This is the most common size in truck campers, fifth-wheels, and many motorhomes. The costly mistake buyers make is assuming their RV's "queen" bed matches a standard bedroom queen — always measure your actual sleeping platform before ordering.

RV King (72" × 75" or 76" × 80", varies by manufacturer): Wider than a standard king in some configurations but often shorter, again built around available vehicle floor space.

For a complete breakdown of RV and camper mattress sizing, off-gassing considerations in a smaller enclosed space, and our top-tested pick, see our full guide: Best RV and Camper Mattress.

Reviewed pick in Short Queen: Brooklyn Bedding Aurora Luxe 14 Inch Short Queen Hybrid ($1,695–$1,705).

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How to Choose the Right Size for Your Room

Leave at least 24–30 inches of clearance on the sides and foot of the bed where you walk regularly — this is the minimum space needed to comfortably move around the bed, open drawers, and make the bed without bumping into furniture. If your room cannot accommodate a mattress size plus this clearance, size down rather than maximizing the mattress at the expense of usable floor space.

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Frequently Asked Questions

What is the difference between a full and a queen mattress?

A full mattress measures 54 × 75 inches; a queen measures 60 × 80 inches. Queen is 6 inches wider and 5 inches longer than full. For two adults sharing a bed, queen provides meaningfully more usable width — full leaves each person with only 27 inches of space, narrower than a standard twin.

Is a California king bigger than a regular king?

Not overall — a California King (72 × 84 inches) is actually 4 inches narrower than a standard King (76 × 80 inches), but 4 inches longer. California King suits taller sleepers and narrower rooms with more available length; standard King suits couples who prioritize width over length.

What size mattress should I buy for a guest room?

Queen is the safest default for a guest room, since it comfortably fits one or two adult guests and matches the bedding and furniture most people already own. Full works well for a smaller guest room used primarily by solo guests.

Do I need special sheets for a Short Queen or California King mattress?

Yes. Both are non-standard sizes that require sheets specifically labeled for that size — standard queen or king sheets will not fit correctly. Short Queen sheets are sold specifically for RV and camper use; California King sheets are widely available but a distinct product from standard King sheets.

What is the best mattress size for two people?

Queen is the most common choice and works well for most couples, but King is the better choice if either partner is a restless sleeper, if you co-sleep with children or pets, or if your bedroom comfortably fits the larger footprint. As a rule of thumb, if you regularly feel cramped or bump into your partner on a queen, sizing up to King meaningfully improves shared-bed comfort.

How do I know if a king mattress will fit through my doorway?

Most king and California King mattresses ship compressed in a box that fits through a standard doorway, even though the assembled mattress would not. If you are buying a traditional (non-boxed) king mattress, measure your doorway, stairwell turns, and hallway width before ordering — a rigid, non-compressed king mattress can be genuinely difficult to maneuver into some bedrooms.

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The Bottom Line

Queen remains the right default for most buyers — it balances shared-bed comfort with room-size practicality and has the widest bedding and furniture selection. Upsize to King if your room and budget allow it and you want more shared space; size down to Full or Twin XL for a solo sleeper in a smaller room. If you are furnishing an RV, camper, or boat, measure your actual sleeping platform before assuming standard queen dimensions apply — see our Best RV and Camper Mattress guide for the full breakdown.

For a deeper comparison of the two most commonly cross-shopped sizes, see our dedicated guide: King vs Queen Mattress.

Browse all reviewed mattresses →