King Size Mattress Dimensions: Everything You Need to Know
Thinking about upgrading your sleep space? A king mattress offers unmatched comfort and room. But before you buy, it's important to know what size is a standard king mattress, what are the dimensions of a king mattress, and how it fits your bedroom. This guide has all the answers.
What Size Is a Standard King Mattress?
The standard king size mattress also known as the Eastern King is the widest bed available in most mattress stores. It's perfect for couples who want maximum personal space or families who co-sleep with children or pets.
What Are the Measurements of a King Mattress?
The standard king mattress dimensions are:
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Width: 76 inches (193 cm)
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Length: 80 inches (203 cm)
This makes it 16 inches wider than a queen mattress, but the same length, giving you extra room to spread out.
How Big Is a Standard King Size Bed in Feet?
If you're thinking in feet, here are the numbers:
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Width: 6 feet 4 inches
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Length: 6 feet 8 inches
This size requires a bedroom that’s at least 12 feet by 12 feet to fit comfortably along with other furniture.
King Size Mattress Width and Length Compared
| Mattress Type | Width (inches) | Length (inches) |
|---|---|---|
| Queen | 60 | 80 |
| King | 76 | 80 |
| California King | 72 | 84 |
The standard king is the widest, offering the most horizontal sleeping space.
Types of King Size Mattresses
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Standard King (76” x 80”) – Great for large bedrooms and couples.
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California King (72” x 84”) – Narrower and longer, ideal for taller people.
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Split King (Two 38” x 80”) – Adjustable base compatible; ideal for couples with different sleep needs.
Who Should Choose a King Mattress?
A king size bed is ideal for:
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Couples who want extra personal space.
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Families who share the bed with children or pets.
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Larger bedrooms where space isn’t an issue.
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Luxury seekers who want the biggest bed available.
Final Thoughts
Understanding what are the measurements of a king mattress and how big is a standard king size bed helps you plan your bedroom and choose the best sleep solution. With the generous king size mattress width and length, this bed is a top choice for space, comfort, and long-term sleep quality.