What Size Is a King Bed?
When shopping for a new mattress, one of the most common questions is: “What size is a king bed?” If you’re looking to upgrade your sleeping space, a king-size bed offers unmatched room and comfort — but it’s important to know the exact measurements before buying.
King Bed Dimensions (US Standard)
A standard king bed (also called an Eastern King) measures:
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76 inches wide
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80 inches long
In metric units, that’s roughly:
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193 cm wide
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203 cm long
This makes the king bed the widest standard mattress size available. It offers plenty of space for couples, growing families, or anyone who loves stretching out.
California King vs. Standard King
You might’ve also heard of a California King — but don’t confuse the two. The California King is:
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72 inches wide
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84 inches long
(approximately 183 cm x 213 cm)
While it’s not as wide as a standard king, it’s longer — making it a better option for taller people who need extra legroom.
Ideal Room Size for a King Bed
To comfortably fit a king bed, your bedroom should ideally be at least:
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12 feet x 12 feet (about 3.65 m x 3.65 m)
This allows space for bedside tables, walking clearance, and other furniture.
Mattress Size Comparison
| Mattress Size | Dimensions (inches) |
|---|---|
| Twin | 38 x 75 |
| Full (Double) | 54 x 75 |
| Queen | 60 x 80 |
| King | 76 x 80 |
| California King | 72 x 84 |
The king-size mattress stands out with the most horizontal sleeping space, perfect for partners who want maximum comfort.
Bedding for a King Bed
Shopping for king bedding? Here’s what to look for:
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Fitted Sheet: 76” x 80”
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Flat Sheet: Around 108” x 102”
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Comforter/Duvet: 104” x 90” or larger
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King Pillows: 20” x 36”
FAQs About King Beds
❓ How big is a king bed in feet?
A standard king bed is approximately 6.3 feet wide by 6.6 feet long.
❓ Is a king bed bigger than a queen?
Yes, a king bed is 16 inches wider than a queen bed, though both are 80 inches long.
❓ What is the difference between a king and a California king?
A standard king is wider, while a California king is longer. Choose a Cal king if you’re tall; choose a standard king for extra width.
❓ Can a king bed fit in a 10×10 room?
Technically yes, but it will be very tight. A 12×12 room or larger is recommended for comfort and furniture layout.
❓ Do two twin beds make a king?
Not quite — two twin XL mattresses (38” x 80”) placed side-by-side equal the size of a king (76” x 80”).
❓ What is the depth or thickness of a king mattress?
The thickness of a king-size mattress can vary greatly depending on the brand and type. Most are between 8 to 14 inches thick, with premium models reaching up to 16–18 inches.
❓ Is a king bed the largest standard mattress size?
In the US, yes — the standard king is the widest standard size. However, larger non-standard options exist, like the Alaskan King (108” x 108”).
❓ What’s the size of a king-size bed in CM?
A standard king-size mattress is approximately 193 cm wide by 203 cm long.
❓ How heavy is a king mattress?
On average, a king mattress weighs 130–180 pounds (59–82 kg), depending on materials (foam, hybrid, innerspring, etc.).
❓ Can I use two twin beds as a king?
Two twin XL beds (38” x 80”) side-by-side = king size (76” x 80”). Two standard twins (38” x 75”) are too short.
❓ Is a king bed good for couples?
Yes! A king bed is ideal for couples, especially those who value personal space or have children or pets joining them at night.
❓ Will a king bed fit through a standard doorway?
Most king mattresses won’t fit through a standard 30″–36″ doorway flat, but can often be bent/folded slightly or delivered as split kings.
❓ What is a split king bed?
A split king is two twin XL mattresses placed on one king frame. It’s great for couples with different firmness needs or adjustable bases.
❓ Do king beds require special frames?
Yes, king beds usually require a dedicated king-size frame, often with center support legs to handle the mattress weight and prevent sagging.
❓ Is bedding for a king bed more expensive?
Generally, yes — king-size bedding costs more than queen or full sizes due to larger dimensions and extra fabric.
❓ Can you put a king bed on a queen frame?
No — a king mattress is too wide for a queen frame. A king requires a properly sized king bed frame.
❓ What’s the difference between a king and super king (UK)?
In the UK, a king is 150 cm x 200 cm, while a super king is 180 cm x 200 cm. The UK super king is similar in width to a US king.
❓ Is a king bed good for families with kids?
Yes. A king bed offers enough room for parents and one or two small children, making it popular for co-sleeping families.
❓ Can you get a king-size bed with storage?
Absolutely. Many manufacturers offer king beds with built-in storage drawers, ottoman lifts, or under-bed compartments.
❓ How much space should be around a king bed?
Ideally, leave 24–30 inches of walking space on each side and at the foot of the bed for comfortable movement and furniture placement.
Final Thoughts
So, what size is a king bed? The answer is 76 inches wide by 80 inches long, giving you a luxurious amount of space to sleep soundly. Whether you’re upgrading your bedroom or furnishing a master suite, a king-size mattress delivers ultimate comfort.
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