What Size Mattress Is a Full? Exact Dimensions, Fit, and FAQs
If you’re wondering “What size mattress is a full?”, you’re usually trying to figure out if it will fit your room, your bed frame, or two sleepers comfortably. This guide explains full mattress dimensions in simple terms and answers the most common questions people have before choosing this size.
What Is a Full-Size Mattress?
A full-size mattress (also called a double mattress) typically measures:
- 54 inches wide
- 75 inches long
In centimeters, that’s approximately 137 cm x 190 cm.
So when you ask, “What size mattress is a full?”, you’re talking about a mattress that is 15 inches wider than a twin, but the same length as a standard twin.
How Is a Full Mattress Different from Other Sizes?
Understanding how a full compares to nearby sizes can help you decide if it’s right for you.
| Mattress Size | Width x Length (inches) | Typical Use |
|---|---|---|
| Twin | 38" x 75" | Kids, single sleepers, small rooms |
| Twin XL | 38" x 80" | Tall teens, college dorms |
| Full | 54" x 75" | Single adults, guest rooms |
| Queen | 60" x 80" | Couples, master or main bedrooms |
| King | 76" x 80" | Couples wanting maximum space |
Key differences:
- Compared to a twin, a full gives a solo sleeper more width to spread out.
- Compared to a queen, a full is 6 inches narrower and 5 inches shorter, which can matter for couples or taller sleepers.
Who Is a Full-Size Mattress Best For?
A full-size mattress can be a good fit in several situations:
- Single adults who want more room than a twin but don’t need a queen.
- Teenagers growing out of a twin bed.
- Guest rooms where space is somewhat limited.
- Smaller apartments or studios where a queen might feel too large.
For two adults, a full mattress can work but often feels cozy and limited in space, especially if both sleepers prefer extra room to move.
Will a Full Mattress Fit in My Room?
When asking “What size mattress is a full?”, the next logical question is whether it will fit comfortably in your space.
A full mattress is 54" x 75", but you also need room for:
- The bed frame or foundation
- Space to walk around the bed
- Any nightstands, dressers, or desks
Many people find a full mattress works well in rooms that are at least about 9 feet x 10 feet, depending on the layout and furniture. Smaller rooms may still work, but floor space will be tighter.
Is a Full Mattress Big Enough for Two People?
A full mattress can technically accommodate two sleepers, but it offers:
- Less width per person than a twin bed would for a single person.
- Limited space if either person tends to move around at night.
Because of this, many couples prefer a queen or larger for everyday use. A full can still be useful for:
- Occasional overnight guests
- Smaller rooms where a queen does not fit
- Couples who are comfortable sleeping close together
Do Full Mattresses Come in Different Lengths?
Standard full mattresses are 54" x 75", but you may also see:
- Full XL: about 54" x 80" (extra length, similar to a queen’s length)
If you are taller or concerned about foot overhang, a Full XL or Queen may feel more comfortable. Not all bedding or bed frames are available in Full XL, so it’s helpful to double-check dimensions when shopping for accessories.
What Bedding and Accessories Fit a Full Mattress?
To avoid sizing issues, look for items labeled specifically as “Full” (or “Double”, in some regions). This usually includes:
- Fitted sheets: designed to fit 54" x 75" mattresses
- Flat sheets and comforters: sized with extra width and length to drape over the sides
- Mattress protectors and pads: cut to full-size dimensions
- Bed frames and foundations: clearly marked as full or double
If your mattress is thicker than average, you may want “deep pocket” fitted sheets for a better fit.
✔️ Quick Mattress Takeaways
Key points consumers should understand about What Size Mattress Is a Full:
- A full-size mattress is 54" wide x 75" long (about 137 cm x 190 cm).
- It is wider than a twin but smaller than a queen, with less space for couples.
- A full is often ideal for single adults, teens, and guest rooms.
- Many people find it works well in rooms around 9' x 10' or larger, depending on furniture.
- Full XL versions add extra length (about 80") for taller sleepers.
- Always match your sheets, frame, and mattress protector to full-size dimensions for the best fit.
Understanding “What size mattress is a full?” helps you choose a bed that fits both your space and your sleeping needs, making it easier to plan your bedroom layout and select compatible bedding.
