What’s The Size Of a Full Size Mattress? Mattress Dimensions Explained

If you’re asking “What’s The Size Of a Full Size Mattress?”, you’re usually trying to figure out whether it will fit you, your room, and your bed frame. This guide explains the exact dimensions of a full mattress, how it compares to other sizes, and when it’s a good fit.

What’s The Size Of a Full Size Mattress?

In most cases, a standard full size mattress measures:

54 inches wide x 75 inches long
(approximately 137 cm x 191 cm)

This is sometimes called a “double” mattress. Both “full” and “double” usually refer to the same standard size.

Do full mattress dimensions ever vary?

While 54" x 75" is the standard, some factors can cause minor differences:

• Certain manufacturers may vary by about an inch.
• Pillow-top or extra-plush models can feel slightly taller in height.
• European or regional sizes may be close but not identical.

For sheet and bed frame shopping, always check the listed size instead of assuming.

How Does a Full Size Mattress Compare to Other Mattress Sizes?

A full size mattress sits in the middle of the size range: bigger than a twin, smaller than a queen.

Key point: A full is 16 inches wider than a twin, giving a single sleeper significantly more room, but it is 6 inches shorter than a queen in length.

Who Is a Full Size Mattress Best For?

When you search “What’s The Size Of a Full Size Mattress?”, you’re often really asking whether a full is big enough. Here are typical uses:

• Teens and growing kids who have outgrown a twin
• Single adults who want more space than a twin offers
• Guest rooms where space and cost are both considerations
• Smaller primary bedrooms or studio apartments

A full can work for two people, but it is generally cozy for couples. Each person gets less width than on a queen.

How Much Floor Space Does a Full Size Mattress Need?

Knowing what’s the size of a full size mattress is only part of the picture. You also need to know if it fits your bedroom layout.

• Mattress: 54" x 75"
• With a typical frame or headboard, plan on about:
  • 60"–62" wide including the frame
  • 80"–85" long if there’s a headboard and footboard

For comfortable movement around the bed, many people aim for:

• At least 24–30 inches of walking space on at least one side
• Enough clearance for doors, closets, and drawers to open fully

📝 Tip: Measure your room and sketch a simple layout before deciding. Include bedside tables if you plan to use them.

Common Questions About Full Size Mattresses

Is a full mattress big enough for two adults?

A full mattress can technically fit two adults, but it may feel tight, especially if:

• Either person moves around at night
• You prefer extra personal space
• One or both sleepers are taller or broader

Many couples prefer a queen or larger, while a full is often more comfortable for one adult.

Is a full the same as a double?

Yes. In most modern usage, “full” and “double” refer to the same size: 54" x 75". The term “double” is older and less commonly used in some regions, but they usually mean the same standard mattress size.

What’s the difference between a full and a full XL?

A full XL mattress (less common) is typically:

• 54 inches wide x 80 inches long

So it has the same width as a standard full, but 5 extra inches of length, similar to the difference between a twin and a twin XL. This can be helpful for taller sleepers who like the width of a full.

What Should I Consider Before Choosing a Full Size Mattress?

When deciding based on what’s the size of a full size mattress, think about:

• Your height:
  At 75 inches long, a full may feel short for taller sleepers, especially those near or above 6 feet.

• Number of sleepers:
  More ideal for one person, or for occasional two-person use.

• Room size:
  Works well in small to medium rooms, allowing space for other furniture.

• Future needs:
  If you expect to share your bed regularly, you may want to plan for a queen or larger.

✔️ Quick Mattress Takeaways

Key points to remember about “What’s The Size Of a Full Size Mattress”:

• A full size mattress is 54" wide x 75" long (about 137 cm x 191 cm).
• Also called a double; in most cases, the terms mean the same size.
• It is 16" wider than a twin, but 6" shorter than a queen.
• Best suited for single adults, teens, and guest rooms.
• Can fit two people, but space will be limited compared to a queen.
• Always check room measurements and allow walking space around the bed.
• Consider full XL (54" x 80") if you want the same width but extra length.

Understanding what’s the size of a full size mattress helps you match your bed not only to your body, but also to your room and daily comfort needs.