Mattress Sizes Guide: Twin, Full, Queen, King, and California King

There are six standard mattress sizes in the United States: Twin (38" x 75"), Twin XL (38" x 80"), Full (54" x 75"), Queen (60" x 80"), King (76" x 80"), and California King (72" x 84"). Queen is the most popular. This guide covers exact dimensions for every size, the room each requires, how much space each sleeper actually gets, and which Avocado organic mattresses are available in each.

The most useful way to compare sizes for couples is width per person:

Expert Tip: A couple on a full bed has less personal space than a child on a twin bed. That single number explains most size upgrades.

The twin is the narrowest standard size: the right fit for children's rooms, bunk beds, trundles, and daybeds. The Twin XL adds 5 inches of length, making it the standard for college dorms and the right choice for taller solo sleepers. Two Twin XLs side by side form a split king. The Avocado Eco Organic Kids Mattress is a low-profile twin designed for kids' beds and bunk safety rails.

Read the complete guide: Twin Bed Dimensions: Complete U.S. Guide to Twin Mattresses
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The full, also called a double, is 16 inches wider than a twin at the same length. It is the most common upgrade for teenagers, a comfortable size for single adults, and the practical choice for guest rooms. Note the length: at 75 inches, a full suits sleepers up to about 6 feet. Two adults fit, but tightly, at 27 inches each.

Read the complete guide: Full Size Bed Dimensions: Complete U.S. Guide to Full Mattresses

The best-selling mattress size in the United States. A queen gives couples 30 inches of width each, fits most primary bedrooms at a 10 x 10-foot minimum, and its 80-inch length suits sleepers up to about 6'2". For couples, the harder decision is usually firmness rather than size; see our Fit Guide for Couples.

Read the complete guide: Queen Bed Dimensions: Complete U.S. Guide to Queen Mattresses

The widest standard size. Each sleeper on a king gets 38 inches, the width of a twin each, which is why it suits co-sleeping families, pet owners, and restless sleepers. A split king is two Twin XL mattresses in the same footprint: each side can have its own firmness and, on a dual adjustable base, its own position. It is also far easier to move through narrow stairs and doorways.

Read the complete guide: King Bed Dimensions: Complete U.S. Guide to King Mattresses

The longest standard size. A California king is 4 inches narrower and 4 inches longer than a standard king: a tradeoff, not an upgrade. It is the right choice when height is the deciding factor (sleepers over 6'2") or when a bedroom is long rather than wide. King and California king bedding are not interchangeable; sheets, protectors, and bases for one will not fit the other.

Read the complete guide: California King Bed Dimensions: Complete U.S. Guide to California King Mattresses
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A mattress needs roughly 24 inches of clearance on each side you access and at the foot of the bed.

The right mattress size comes down to five practical factors: who shares the bed, the size of your room, the mattress profile height, how the mattress will be delivered to your home, and whether each side of the bed needs to be independent.
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Width per sleeper is the number that matters. On a Queen, each partner gets 30 inches — narrower than a Twin. A King adds 8 inches of width (4 per person), which is why it's the most practical upgrade for couples; a California King trades 4 inches of width for 4 extra inches of length, best for sleepers over six feet. If a dog or young child regularly joins the bed, count them as a sleeper — a frequent reason couples size up from Queen to King. For motion isolation, firmness differences, and temperature when sharing a surface, see our couples fit guide.

A comfortable bedroom leaves at least 24 inches of walkway on the open sides of the bed. Practical room minimums: Twin, 7 × 10 feet; Full, 9 × 10; Queen, 10 × 10; King, 12 × 10 (12 × 12 is comfortable); California King, 12 × 12.

Design notes: each example demonstrates a different decision moment — Twin shows the against-the-wall layout, Full shows the workable-vs-comfortable range, Queen shows the classic 10-vs-9-foot tradeoff, King justifies its own 12-foot minimum by showing the failure case, and Cal King is the only one where length does the work, which is true to the size. Every number is arithmetic; nothing to verify or maintain. All six are editor pastes (the five non-Twin articles have unprotected headings, and the Twin's tables would lose their shading again on a push — not worth it for one paragraph while you're already pasting).

Profile height varies more than footprint. Avocado mattresses range from 9 inches (Latex Mattress) to 15.5 inches (Green Mattress Ultra Plush). Taller profiles — the Plush, Ultra Plush, and Luxury Pillow-Top and Box-Top — require deep-pocket sheets and protectors, and mattress-plus-foundation height determines how easy the bed is to get in and out of. Per-model heights and weights are in the specification guides below.

Most Avocado mattresses ship compressed and rolled in a rectangular box, so they navigate stairways and tight turns far more easily than an expanded mattress — and even our flat-shipped models (Extra Firm, Luxury Organic, and Grand Luxe) arrive in a box. Once expanded, a mattress cannot be re-compressed, so measure doorways and stairwells before moving day. Natural materials are heavier than polyurethane foam — a Queen runs roughly 94 to 160 pounds by model — so plan on two people, or our White Glove In-Home Delivery. Boxed models are sleep-ready about 30 minutes after unboxing and fully expanded within 3 to 5 hours — see the unboxing guide.

A split king is two Twin XL mattresses (38" × 80" each) on a king-size frame — the same footprint as a King, with each side independent. It's the right answer when partners' firmness preferences differ by two or more steps, or when one or both partners use an adjustable base. The couples fit guide covers split-king setups, bridge pads, and adjustable base pairings in full.

Exact dimensions, weights, and heights for every size: Avocado Green Mattress · Eco Organic · Luxury Organic · Vegan, Wool & Latex · Eco Organic Kids · Crib Mattresses

Profile height varies more than footprint. Avocado mattresses range from 9 inches (Latex Mattress) to 15.5 inches (Green Mattress Ultra Plush), with the Luxury Organic Mattress at 13.25 to 15 inches depending on configuration. Height affects two practical decisions: taller profiles — the Plush, Ultra Plush, and Luxury Pillow-Top and Box-Top — require deep-pocket sheets and protectors, and total bed height (mattress plus foundation) determines how easy the bed is to get in and out of. Per-model heights and weights for every size are in the specification guides linked below.

Yes — because most Avocado mattresses ship compressed and rolled in a rectangular box, they navigate stairways, hallways, and tight turns far more easily than an expanded mattress. Even our flat-shipped models (Extra Firm, Luxury Organic, and Grand Luxe) arrive in a box approximately 13 inches deep. One important caution: once expanded, a mattress cannot be re-compressed, so measure doorways and stairwells before moving day. Natural materials are heavier than foam — a Queen ranges from roughly 94 to 160 pounds by model — so we recommend two people, or our White Glove In-Home Delivery service.

Most models ship compressed and rolled, wrapped in 100% recycled kraft paper inside a rectangular box. Once the vacuum seal is cut, the mattress is sleep-ready in about 30 minutes and fully expanded within 3 to 5 hours — open it within 30 days of delivery. Three models ship flat in a freight box and require no expansion: the Extra Firm, Luxury Organic, and Grand Luxe. Step-by-step setup is in our unboxing guide.

Exact dimensions, weights, and heights for every size:

Every brand's queen is 60 by 80 inches. What varies between mattresses is not the footprint but what fills it. Most conventional mattresses are built around polyurethane or memory foam, a petroleum-derived material, with chemical adhesives and synthetic fabrics that can emit volatile organic compounds (VOCs) into bedroom air.

Every Avocado mattress, in every size from crib to California king, is made with GOTS-certified organic cotton, GOLS-certified organic latex, and organic wool, without polyurethane foam, chemical flame retardants, or fiberglass, and is certified organic under GOTS at the finished-product level. GOTS certifies the entire mattress as it arrives in your home, not individual components inside an otherwise conventional product. It is one of six independent finished-product certifications our mattresses hold: GOTS, OEKO-TEX® Standard 100 Class I, MADE SAFE®, EWG Verified®, GREENGUARD Gold, and UL® Formaldehyde-Free. We also test core materials for PFAS: 679 substances screened at parts-per-billion sensitivity, with no detectable amounts found.

Whatever size fits your room, the standard for what is inside it should not change. Explore our certifications to see what each one verifies.

Queen (60" x 80") is the best-selling mattress size in the United States, followed by king. It fits most bedrooms and works for both couples and solo sleepers.

A king (76" x 80") is 4 inches wider; a California king (72" x 84") is 4 inches longer. Bedding and bases for one will not fit the other.

Yes. Full and double refer to the same size: 54" x 75".

Yes. Two Twin XLs (38" x 80" each) side by side match a standard king's 76" x 80" footprint. This is called a split king.

Queen is the practical minimum for two adults at 30 inches per person. King provides 38 inches per person, the width of a twin each.

Within the U.S., yes. International sizes differ, so verify dimensions before pairing a U.S. mattress with an imported frame.

An 84-inch California king is the safest choice. Queen and king (80 inches) work for most sleepers up to about 6'2".