What Is the Width of a Standard King Size Bed?

A king size bed is a popular choice for those who want extra room to stretch out. But many shoppers ask the same question: how wide is a king size bed?

The answer depends on where you live. Bed sizes differ between the US and UK, and there are also unique king variations.

Understanding the exact width helps you choose the right mattress for comfort and space.

Quick Answer

• US King: 76" W × 80" L

• UK King: 150 cm W × 200 cm L (≈ 5' W × 6'6" L)

• California King: 72" W × 84" L

• Split King: Two 38" W × 80" L mattresses

What Is the Standard King Size Bed Width?

A standard US king-size bed is one of the most spacious options for couples who want more personal sleeping space. It is wider than it is long, giving both sleepers plenty of room to move at night. These mattresses are popular for master bedrooms and larger spaces.

Many people call this size the Eastern King, but both names mean the same thing. If you want a bed with maximum width, this is usually the top pick.

Also read: How Big Is a Queen Size Bed

What is a Standard US King Size Bed?

A standard US king size bed measures 76 inches wide and 80 inches long. This generous width gives two adults plenty of personal sleeping space and helps reduce disturbances during the night.

In centimeters, a US king is approximately 193 cm wide and 203 cm long, offering a large sleeping surface that fits well in spacious master bedrooms.

In feet, a US king equals 6 feet 4 inches wide by 6 feet 8 inches long, giving couples roomy comfort and extra space for pillows or pets.

What About the UK King Size Bed?

A standard UK king size bed measures 59 inches wide and 79 inches long, making it slightly narrower than the US version while still comfortable for couples.

In centimeters, the UK king is 150 cm wide and 200 cm long, which is the most popular size for primary bedrooms in the United Kingdom.

In feet, a UK king equals 5 feet wide by 6 feet 6 inches long, creating a supportive sleeping area without overwhelming average-sized bedrooms.

Other King Bed Types and Their Width

Not all king beds are the same. There are a few variations that change the width or length:

California King

• 72 inches wide x 84 inches long

• Narrower than a US king but longer

• Better for tall people who need leg room

Split King

• Two mattresses, each 38 inches wide x 80 inches long

• Same total size as a standard US king when put together

• Independent sides allow different firmness or adjustable bases

These options let sleepers pick what fits their space and lifestyle best.

Also read: How to Accurately Measure Your Ring Size

Comparing King Size Beds With Other Mattress Sizes

Type	Width	Length	Width (cm)	Length (cm)
US King (Standard)	76 in	80 in	193 cm	203 cm
UK King (Standard)	59 in (≈5 ft)	79 in (6 ft 6 in)	150 cm	200 cm
California King	72 in	84 in	183 cm	213 cm
Split King (2 × Twin XL)	2 × 38 in = 76 in	80 in	2 × 97 cm = 194 cm (total ≈193 cm)	203 cm

Pros and Cons of a King Size Bed

Benefits

• Maximum space for two people

• Better sleep quality due to less disturbance

• Impressive look in a master bedroom

Drawbacks

• Needs a large room

• Higher cost for mattress and bedding

• Harder to move or lift

Still, most shoppers feel the benefits outweigh the downsides.

Buying Tips for the Right King Size Bed

To pick the perfect king:

• Check bedroom measurements

• Choose bed type based on body height

• Test mattress firmness together

• Confirm sheet and bed-frame compatibility

One more key tip: Consider delivery space—stairs and doorways may limit options.

Conclusion

A king-size bed offers generous space and improved sleep comfort, especially for couples. With different width options in the US and UK, it is important to check exact measurements before buying.

You can also explore variations like the California King or Split King for personal preference. Each option supports different room sizes and sleep styles.

By choosing the right king bed size, you can create a cozy, restful bedroom that meets your needs.