Mattress Size Glossary: California King, Eastern King, Olympic Queen, and Every Other Size

Also known as: Cal King, Western King

72 x 84 in · 182.88 x 213.36 cm

Longer and narrower than Standard King. Origin: mid-20th-century West Coast manufacturers catering to taller clientele.

Also known as: Standard King, King

76 x 80 in · 193.04 x 203.2 cm

The default US King. The historic name 'Eastern King' contrasts with 'Western King' (California King).

Also known as: Continental King

Varies (typically 62.99 x 78.74) in · Typically 160 x 200 cm

Continental European size; varies by country. Spain, France, Italy each have slightly different conventions. Closer to a US Queen than a US King.

Also known as: Double

54 x 75 in · 137.16 x 190.5 cm

The historic 'matrimonial' size before Queen and King became dominant. Common in guest rooms and smaller bedrooms.

Also known as: Texas King (varies)

Typically 80 x 84 to 80 x 98 in · Typically 203.2 x 213.36 to 203.2 x 248.92 cm

Non-standard oversized King. Each manufacturer defines its own dimensions. Very limited bedding availability.

66 x 80 in · 167.64 x 203.2 cm

Six inches wider than a Queen. Common in hospitality and some upgrade lines. Not on the ISPA standard schedule. Sheet selection is thin.

60 x 80 in · 152.4 x 203.2 cm

The most common US size. The reference anchor for upgrades to either King.

Also known as: RV Queen

60 x 75 in · 152.4 x 190.5 cm

Common in RVs and travel trailers. Five inches shorter than a standard Queen to fit the smaller wheelbase.

Two pieces of 36 x 84 in · Two of 91.44 x 213.36 cm

Two XL Twin mattresses sold as a pair for adjustable bases. The XL Twin half-size is not on the ISPA schedule; expect narrower availability.

76 x 80 (split at head only) in · 193.04 x 203.2 cm

One mattress with a head-only split allowing each side's head to elevate independently. Single fitted sheet. Common compromise between full split and single mattress.

Two pieces of 38 x 80 in · Two of 96.52 x 203.2 cm

Two Twin XL mattresses sold as a pair. Twin XL is on the ISPA standard schedule; widely available and the most common adjustable-base configuration.

Also known as: Eastern King, King

76 x 80 in · 193.04 x 203.2 cm

See Eastern King. The default US King size.

70.87 x 78.74 in · 180 x 200 cm

UK retail size. Narrower than US King and shorter than Cal King. UK sheet sets do not fit US mattresses.

Also known as: Waterbed Single

48 x 84 in · 121.92 x 213.36 cm

Waterbed-era size, rare in modern mattress retail. Some legacy waterbed accessory ranges still produce sheets in this size.

Typically 80 x 98 in · Typically 203.2 x 248.92 cm

Oversized regional name; dimensions vary by manufacturer. Bedding is mail-order only and significantly more expensive.

38 x 75 in · 96.52 x 190.5 cm

The default US single bed for children and guest rooms. Five inches shorter than Twin XL.

38 x 80 in · 96.52 x 203.2 cm

Standard US college dorm size. The half-size of a Split King. Same length as Queen and Standard King; same width as Twin.

59.06 x 78.74 in · 150 x 200 cm

UK retail size labelled simply 'King.' Closer in width to a US Queen than a US King. UK and US King sheets are not interchangeable.

Typically 84 x 84 (square) in · Typically 213.36 x 213.36 cm

Oversized square King. Very rare; bedding is mail-order. Not on the ISPA schedule.

36 x 84 in · 91.44 x 213.36 cm

The half-size of a Split Cal King. Not on the ISPA standard schedule. Distinct from Twin XL (38 by 80, ISPA standard) despite the similar name.