What’s The Length Of a Full Size Mattress? Dimensions, Fit, and FAQs

If you’re asking “What’s The Length Of a Full Size Mattress?”, you’re usually trying to figure out whether it will fit your room, your frame, or your height. This guide breaks down standard full mattress dimensions, how they compare to other sizes, and what to keep in mind before you buy.

What’s The Length Of a Full Size Mattress?

In most cases, the standard length of a full size mattress is 75 inches (about 191 cm).

A full mattress is commonly listed as:

• 54 inches wide x 75 inches long

This size is sometimes called a “double” mattress, but the dimensions are the same in typical North American sizing.

👉 Key point: When people ask “What’s The Length Of a Full Size Mattress?”, the standard answer is 75 inches in length.

Why Does the Length of a Full Mattress Matter?

Knowing the exact length helps with:

• Comfort for your height – Taller sleepers may find 75 inches short.
• Room layout – Length affects where you place the bed relative to doors, closets, and windows.
• Frame and bedding compatibility – Bed frames, box springs, and fitted sheets are sized to match mattress length.

A mattress that’s too short can lead to feet hanging over the edge or needing to sleep in a curled position. A mattress that’s too long for your room can block walkways or storage.

How Does a Full Mattress Compare to Other Mattress Lengths?

Here’s a simple comparison of standard mattress sizes and lengths:

🔎 Notice:
The full mattress shares the same length as a twin (75 inches), but wider. Queen and king sizes are typically 5 inches longer than a full.

Is a Full Mattress Long Enough for My Height?

Whether the 75-inch length is enough depends on how tall you are and how you sleep.

As a general guideline:

• If you are around average height or shorter, a full mattress length is often adequate.
• If you are tall or prefer extra legroom, a longer mattress (like a queen, twin XL, or king) may feel more comfortable.

Many sleepers like at least a few inches of extra space between their height and the end of the bed, especially if they sleep with pointed toes, stretch out, or use thick pillows that move them slightly down the mattress.

Are There Different Lengths for a “Full” Mattress?

Most full mattresses follow the 54" x 75" standard, but a few variations can exist:

Full XL (Less Common)

Some manufacturers offer a Full XL with approximate dimensions:

• 54 inches wide x 80 inches long

A Full XL keeps the same width as a standard full but adds about 5 inches of extra length, making it similar in length to a queen or twin XL.

Regional and Brand Variations

Mattress dimensions can sometimes vary by an inch or so based on:

• Manufacturing tolerances
• The style of mattress (for example, thick pillow tops can add height but not length)
• Whether measurements include rounded corners or not

Because of this, it’s often helpful to check exact dimensions if you’re fitting a tight frame or custom bed.

How Much Space Does a Full Mattress Take in a Bedroom?

When asking “What’s The Length Of a Full Size Mattress?”, many people also want to know how it affects room layout.

A standard full mattress:

• Length: 75 inches
• Plus frame/headboard: often adds several inches at the head or foot

To plan your space:

• Leave walking space around the sides or foot of the bed where possible.
• Consider doors, closets, drawers, or desks that might be blocked by the bed.
• Remember that headboards and footboards can effectively increase how much floor space the bed uses.

A full mattress can work well in smaller rooms, guest rooms, or for a single sleeper who wants more width than a twin.

What Bedding Fits a Full Size Mattress?

Because the length is 75 inches, you’ll want bedding labeled as:

• “Full” or “Double” fitted sheets – cut for 54" x 75"
• Full size mattress protectors and toppers
• Comforters and duvets marked Full/Queen are common and usually designed to drape over a full mattress comfortably.

Using bedding designed for longer sizes (like queen or twin XL) can lead to extra loose fabric at the ends, while bedding for shorter or narrower sizes may not fit securely.

✔️ Quick Mattress Takeaways

Key points to understand about “What’s The Length Of a Full Size Mattress?”

• A standard full size mattress is 54" wide x 75" long.
• The length of a full mattress is 75 inches in most cases.
• Full and twin mattresses are the same length, but a full is wider.
• Queen, king, and many larger sizes are typically 5 inches longer than a full.
• Taller sleepers or those wanting extra legroom may prefer a longer size (Twin XL, Queen, King).
• Full mattresses are often a practical choice for smaller rooms or single sleepers who want more width than a twin.
• Always confirm exact manufacturer dimensions if your frame or space is very precise.

Understanding what’s the length of a full size mattress helps you choose a bed that fits both your body and your bedroom, making it easier to plan a comfortable and functional sleep space.