Family Bed

A Family Bed is an extra-wide mattress for co-sleeping families: 120 × 80 in (305 × 203 cm) (10 ft wide) for the standard size and 144 × 84 in (366 × 213 cm) (12 ft wide) for the Family Bed XL. That is up to 99% more surface than a King.

120 × 80inches (10 ft)
144 × 84inches (XL, 12 ft)
66.7 / 84sq ft
30 ineach for 4 (10 ft)
36 ineach for 4 (XL)
17 × 9.5 ftroom for XL*

*Room size = our calculation, with 30 in (76 cm) of walking space on both sides and at the foot.

Size	Inches (W × L)	Centimeters	Surface	vs. King
King (Eastern King)	76 × 80 in	193 × 203 cm	42.2 sq ft (3.92 m²)	—
Alaskan King	108 × 108 in	274 × 274 cm	81 sq ft (7.53 m²)	+92%
Family Bed	120 × 80 in	305 × 203 cm	66.7 sq ft (6.19 m²)	+58%
Family Bed XL	144 × 84 in	366 × 213 cm	84 sq ft (7.8 m²)	+99%

What is a family bed?

"Family bed" means two things: a way of sleeping (parents and children sharing one bed) and a mattress size built for it. As a size, the Family Bed trades length for width. It keeps roughly the length of a King (80 or 84 in) and stretches the width to 10 or 12 ft, so a whole family can sleep side by side.

It is also the oversized size whose dimensions vary most between sellers. The makers and retailers we checked list the Family Bed at 120 × 80 in and the XL at 144 × 84 in, but one oversized-bed guide we read gives the Family Bed as 108 × 84 in. Always check the inches.

Family Bed sizes compared

Size	Inches (W × L)	Centimeters	Feet	Surface	Min. room*
King (Eastern King)	76 × 80 in	193 × 203 cm	6 ft 4 in × 6 ft 8 in	42.2 sq ft (3.92 m²)	11.3 × 9.2 ft
California King	72 × 84 in	183 × 213 cm	6 ft × 7 ft	42 sq ft (3.9 m²)	11 × 9.5 ft
Alaskan King	108 × 108 in	274 × 274 cm	9 ft × 9 ft	81 sq ft (7.53 m²)	14 × 11.5 ft
Florida King	108 × 80 in	274 × 203 cm	9 ft × 6 ft 8 in	60 sq ft (5.57 m²)	14 × 9.2 ft
Family Bed	120 × 80 in	305 × 203 cm	10 ft × 6 ft 8 in	66.7 sq ft (6.19 m²)	15 × 9.2 ft
Family Bed XL	144 × 84 in	366 × 213 cm	12 ft × 7 ft	84 sq ft (7.8 m²)	17 × 9.5 ft

*Minimum room = bed plus 30 in (76 cm) of walking space on both sides and at the foot. Our calculation, not a manufacturer figure.

Family Bed vs. Alaskan King: the Family Bed is 12 in wider but 28 in shorter, and smaller overall (66.7 sq ft against 81).
Family Bed XL vs. Alaskan King: the XL is 36 in wider and 24 in shorter, and slightly bigger overall (84 sq ft).
Family Bed vs. two Queens: two Queens side by side also make 120 × 80 in, as two separate mattresses with two sets of sheets. A Family Bed is made for that size and takes one fitted sheet of 120 × 80 in.

Every oversized size side by side: biggest bed sizes compared.

How many people fit on a family bed?

Sleepers	Family Bed (120 in)	Family Bed XL (144 in)	Alaskan King (108 in)
3	40 in each	48 in each	36 in each
4	30 in each	36 in each	27 in each
5	24 in each	28.8 in each	21.6 in each

Our calculation: mattress width divided by the number of sleepers. For reference, each of two people on a standard King has 38 in.

Co-sleeping with a baby: what pediatricians recommend

The American Academy of Pediatrics does not recommend bed-sharing with infants under any circumstances. It recommends room-sharing instead: the baby sleeps in the parents' room, close to their bed, but on a separate surface designed for infants (crib, bassinet or play yard), ideally for at least the first six months. Source: AAP, HealthyChildren.org.

A family bed is for older children who can safely share an adult bed. If you have a baby, one setup that follows this advice is a family bed for the parents and older children, with a bassinet right next to it.

Will a family bed fit in your bedroom?

Width is the constraint. By our calculation, with 30 in of walking space on both sides and at the foot, a Family Bed needs a room of at least 15 × 9.2 ft and a Family Bed XL 17 × 9.5 ft. The first number is the headboard wall. If you have a long wall but not much depth, a Family Bed often fits where an Alaskan King doesn't.

Family Bed mattress prices

Mattress	Family Bed 120 × 80 in	Family Bed XL 144 × 84 in
Ours: memory foam, 13 in	$4,659	$5,319
Ours: hybrid with coils, 13 in	$5,319	$5,979
Range at the makers we track	$3,299 to $5,997	$3,629 to $6,997

Our prices include curbside delivery to the 48 contiguous states, and each mattress arrives in 3 boxes that are assembled in the room without tools. Market ranges: mattress-only prices for the exact size, checked on October 5, 2026; bundles with a frame or an adjustable base are left out so the comparison stays like-for-like.

Family Bed frames and sheets

Item (range at the makers)	Family Bed	Family Bed XL
Bed frame	$2,299 to $8,995	$2,499 to $10,495
Sheets, comforter or duvet insert (each)	$249 to $1,250	$299 to $1,550

A standard King sheet (76 × 80 in) covers only about two-thirds of the width of a 120 in mattress, so you need sheets sold for the Family Bed size.

Family Bed or Alaskan King?

Family Bed if you want the most width for the least floor depth, and nobody needs more than the 80 in length of a standard King.
Family Bed XL for four sleepers who want 36 in each, or five at about 29 in each.
Alaskan King if you want a square bed with the full 9 ft in both directions, or tall adults will share it.

Is anything bigger than an Alaskan King? The answer, with the Family Bed XL in the numbers: Texas King vs. Wyoming King vs. Alaskan King. And the biggest bed ever built holds a Guinness record at 86 ft 11 in long.

Family Bed Mattress

See all 2 →

Shop Family Bed mattresses

Family bed: your questions answered

How big is a family bed?

The makers we checked list the Family Bed at 120 × 80 in (305 × 203 cm), 10 ft wide, and the Family Bed XL at 144 × 84 in (366 × 213 cm), 12 ft wide. Sizes vary more than for any other oversized bed, so check the inches on each listing.

Is a family bed bigger than an Alaskan King?

The standard Family Bed (120 × 80 in) is wider but smaller overall than an Alaskan King (108 × 108 in): 66.7 sq ft against 81. The Family Bed XL (144 × 84 in) is slightly bigger, at 84 sq ft.

How much does a family bed cost?

Mattress-only prices for a 120 × 80 in Family Bed ran from $3,299 to $5,997 at the US makers we track on October 5, 2026, and from $3,629 to $6,997 for the 144 × 84 in XL. Ours start at $4,659 for the 120 × 80 in memory foam mattress, with curbside delivery to the 48 contiguous states.

Is it safe to co-sleep with a baby in a family bed?

The American Academy of Pediatrics does not recommend bed-sharing with infants. It recommends room-sharing: the baby sleeps close to the parents' bed but on a separate surface designed for infants, ideally for at least the first six months.

What size room do you need for a family bed?

By our calculation, with 30 in of walking space on both sides and at the foot, a Family Bed needs at least 15 × 9.2 ft and a Family Bed XL at least 17 × 9.5 ft. The first figure is the length of the headboard wall.

Can you use two Queen mattresses as a family bed?

Two Queens side by side measure 120 × 80 in, the same footprint as a Family Bed, but as two separate mattresses with two sets of sheets. A Family Bed is made for that size: it is delivered in three boxes whose components come together in the bedroom without tools, and takes one fitted sheet of 120 × 80 in.

Is a family bed a good idea?

It depends on the children's ages. A family bed is for older children who can safely share an adult bed; for babies, the American Academy of Pediatrics does not recommend bed-sharing and advises room-sharing on a separate sleep surface.

What is the difference between a family bed and a King bed?

A Family Bed keeps roughly the length of a King, 80 or 84 in, but stretches the width to 10 or 12 ft, against 76 in for a King, so a whole family can sleep side by side.

Last reviewed October 5, 2026.