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.

Find your perfect fit: mattress size comparison showing Twin at 38 by 75 inches, Queen at 60 by 80 inches, and King at 76 by 80 inches, stacked and aligned at one corner with human figures for scale

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.

← Back to Bed & Mattress Sizes