What Size Is a King Mattress in Feet? Dimensions, Fit, and FAQs
If you’re asking “What Size Is a King Mattress In Feet”, you’re usually trying to figure out whether a king bed will actually fit your bedroom and suit your needs. This FAQ-style guide walks through exact dimensions in feet, how they compare to other mattress sizes, and what else to consider before choosing a king.
What size is a standard king mattress in feet?
A standard king mattress (often called an “Eastern king”) typically measures:
- Width: 76 inches
- Length: 80 inches
In feet, that is:
- Width: 6.33 feet (about 6 feet 4 inches)
- Length: 6.67 feet (about 6 feet 8 inches)
So when people ask “What Size Is a King Mattress In Feet”, the most accurate short answer is:
Some manufacturers may vary by an inch or so, but these dimensions are the generally accepted standard.
How does a king mattress compare to a queen in feet?
Many shoppers want to know whether the extra space is worth it.
- Queen mattress: 60" x 80" → 5 feet x 6.67 feet
- King mattress: 76" x 80" → about 6.33 feet x 6.67 feet
This means a king mattress:
- Has the same length as a queen (about 6.7 feet)
- Is about 1.3 feet wider than a queen
That extra width can make a noticeable difference for:
- Two adults who prefer more personal space
- Sleepers who share the bed with a child or a pet
- People who move around more at night
Are there other types of king mattresses with different sizes?
Yes. When exploring “What Size Is a King Mattress In Feet”, it helps to know that “king” is a general category that includes a few common variations:
| Mattress Type | Inches (W x L) | Approx. Feet (W x L) |
|---|---|---|
| Standard King | 76" x 80" | 6.3' x 6.7' |
| California King | 72" x 84" | 6.0' x 7.0' |
| Split King* | 76" x 80" total | Two 3.17' x 6.7' sections |
*A split king is usually two twin XL mattresses placed side by side to create a king-size sleep surface.
Key differences:
- California king: Slightly narrower but longer than a standard king
- Standard king: Wider but a bit shorter than a California king
- Split king: Same overall size as a standard king, but divided into two pieces
How much room do I need for a king mattress?
Knowing what size a king mattress is in feet is only half the equation. The other half is making sure your bedroom can handle it comfortably.
A standard king is about 6.3 feet wide. To plan your room, consider:
- Space for walking around the bed
- Room for nightstands
- Closet and door clearance
Many people find that a king mattress fits more comfortably in bedrooms that are at least around:
- 12 feet x 12 feet or larger for a more open feel
- Slightly smaller rooms can work, but floor space may be tight
These are general guidelines, not strict rules. The layout of your room, window placement, and furniture style also matter.
Will standard sheets and bedding fit all king mattresses?
Not always. Bedding is sized to match mattress dimensions:
- Standard king bedding is made for 76" x 80"
- California king bedding is made for 72" x 84"
- Split king bedding often uses two twin XL fitted sheets plus one king flat sheet or a king-size comforter
If you buy bedding for a standard king and use it on a California king, the fitted sheet usually won’t reach properly at the corners.
Is a king mattress right for my height?
If you are mainly asking “What Size Is a King Mattress In Feet” because of height concerns, focus on length:
- Standard king length: 80 inches → about 6.67 feet
- California king length: 84 inches → exactly 7 feet
People over about 6 feet tall sometimes prefer the extra length of a California king, particularly if they like to stretch out or sleep toward the very end of the bed. However, many tall sleepers are also comfortable on a standard king, especially when using pillows and sleeping slightly diagonally.
✔️ Quick Mattress Takeaways
Key points consumers should understand about “What Size Is a King Mattress In Feet”
- A standard king mattress is about 6.3 feet wide by 6.7 feet long (76" x 80").
- It is wider than a queen by about 1.3 feet, but the same length.
- A California king measures about 6.0 feet by 7.0 feet (72" x 84"), trading some width for extra length.
- A split king has the same overall size as a standard king but comes in two separate pieces.
- For a comfortable layout, many bedrooms work best with around 12' x 12' or more for a king mattress.
- Always match bedding and bed frames to the exact king size (standard, California, or split).
Understanding what size a king mattress is in feet helps you check fit, plan your bedroom layout, and choose the right accessories. With the dimensions in mind, it becomes much easier to decide whether a king, California king, or another size will work best for your space and sleeping habits.
