How to Measure Room
Bed & Mattress Sizes

Mattress Size Chart: Every Standard Bed Size

A queen mattress is 60 x 80 inches, the most common size sold in the US. Full sizing runs from Twin (38 x 75 in) up to California King (72 x 84 in) — see the full chart below.

A queen mattress measures 60 x 80 inches (152 x 203 cm) and is the most common size sold in the US. The full range runs from Twin at the small end up to California King at the large end — the complete chart is below.

King — 76×80" Queen — 60×80" Twin — 38×75"

Relative footprint of twin, queen, and king, aligned at one corner. Full range in the chart below.

Standard mattress sizes

Size Inches Centimeters
Twin 38 x 75 in 97 x 191 cm
Twin XL 38 x 80 in 97 x 203 cm
Full / Double 54 x 75 in 137 x 191 cm
Queen 60 x 80 in 152 x 203 cm
King 76 x 80 in 193 x 203 cm
California King 72 x 84 in 183 x 213 cm

A quick way to picture the differences

  • Twin → Twin XL: same width, 5 inches longer — the extra length matches a queen or king, which is why Twin XL is standard for dorm beds and taller kids’ rooms.
  • Twin → Full: 16 inches wider, same length — a meaningful step up in sleeping space for a single sleeper.
  • Full → Queen: 6 inches wider, 5 inches longer — a modest increase in both directions.
  • Queen → King: 16 inches wider, same length — the width increase is the whole story here; a king doesn’t give you more legroom than a queen, just more shoulder room.
  • King → California King: 4 inches narrower, 4 inches longer — a trade of width for length, popular with taller sleepers.

Choosing a size for your room

Beyond personal preference, the bed needs enough clearance around it to walk comfortably — see how to measure a room for furniture for walkway clearance guidelines, our bedroom rug size guide for matching a rug to whichever size you land on, and average bedroom sizes if you’re comparing your room to typical dimensions before deciding.

Frequently Asked Questions

What size is a queen bed?

60 x 80 inches (152 x 203 cm). It's the most popular mattress size sold in the US, fitting comfortably in most primary and guest bedrooms while leaving more floor space than a king.

How big is a queen size bed?

60 inches wide by 80 inches long (152 x 203 cm) — the same dimensions as a standard queen mattress, since "how big" and "what size" are asking the same question here.

What size is a king bed?

76 x 80 inches (193 x 203 cm) for a standard king. It's the same length as a queen but substantially wider — 16 inches wider — making it a popular choice for couples who want more individual space.

How big is a king size bed?

76 inches wide by 80 inches long (193 x 203 cm) for a standard king — 16 inches wider than a queen at the same length.

What size is a California king bed?

72 x 84 inches (183 x 213 cm). It's narrower than a standard king but 4 inches longer, which makes it a common choice for taller sleepers, though it's less widely available and can be harder to find sheets for.

What size is a full or double bed?

54 x 75 inches (137 x 191 cm). Full and double refer to the same size — "double" is the older term, still used somewhat interchangeably with "full" today.

How big is a full size bed?

54 inches wide by 75 inches long (137 x 191 cm) — the same as a double bed, which is just an older name for the same size.

What size is a twin bed?

38 x 75 inches (97 x 191 cm) for a standard twin, the size typically used for a single sleeper, kids' room, or bunk bed.

What's the difference between a twin and a twin XL?

Both are 38 inches wide, but twin XL is 80 inches long — 5 inches longer than a standard twin's 75 inches, matching the length of a queen or king. Twin XL is the standard size for many dorm room beds, which is why it's a common gap when shopping for dorm bedding versus a bed at home.

How much bigger is a king than a queen?

A king is 16 inches wider than a queen (76" vs 60") but the same length (80"). That extra width is entirely additional individual sleeping space when shared by two people — each side is effectively as wide as a twin bed.

What size mattress fits a small bedroom?

A full or queen is the usual ceiling for a small bedroom (under about 120 sq ft) once you leave room to walk around the bed — a king can technically fit the floor space but often leaves too little clearance on the sides. Measure your room and leave at least 24-30 inches on each side you'll walk past regularly before picking a size.

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