What Size Is Full Mattress? Dimensions, Fit, and FAQs
If you’re asking “What size is full mattress?”, you’re likely trying to figure out whether a full bed will fit your room, your body, or both. This guide walks through the exact dimensions, how a full compares to other mattress sizes, and when it’s a practical choice.
What Size Is Full Mattress in Inches and Centimeters?
In the United States, a standard full mattress typically measures:
- 54 inches wide x 75 inches long
- Approximately 137 cm wide x 191 cm long
You may also see a full mattress called a “double”. In most modern sizing charts, “full” and “double” mean the same size.
Some manufacturers may round the dimensions slightly, but 54" x 75" is widely accepted as the standard.
How Does a Full Mattress Compare to Other Sizes?
Understanding what size is full mattress often means comparing it to twin and queen sizes.
| Size | Width (in) | Length (in) | Typical Use |
|---|---|---|---|
| Twin | 38 | 75 | Single sleeper, kids, smaller rooms |
| Full/Double | 54 | 75 | Single adult, teen, small guest room |
| Queen | 60 | 80 | Couples, primary sleeping space |
Key differences:
- A full is 16 inches wider than a twin, giving more elbow room for a single sleeper.
- A queen is 6 inches wider and 5 inches longer than a full, which many couples find more comfortable.
- The length of a full and twin are the same in standard sizing: 75 inches.
Is a Full Mattress Big Enough for Two People?
A common follow-up to “What size is full mattress?” is whether it works for couples.
- A full mattress can technically fit two people, especially for short-term or occasional use.
- However, many adults find the width a bit tight for long-term shared sleeping.
- Each person would have about 27 inches of personal space—narrower than the width of many standard pillows.
For single adults, a full mattress often feels comfortably spacious, particularly in smaller rooms.
Who Is a Full Mattress Best For?
A full mattress size tends to work well for:
- Single adults who want more width than a twin without taking up as much space as a queen.
- Teenagers transitioning from a twin bed.
- Guest rooms where the bed will be used occasionally.
- Smaller bedrooms or studio apartments, where floor space is limited.
People who are taller than about 6 feet may feel that the standard full length (75 inches) is not quite enough, especially if they prefer extra legroom.
How Much Room Does a Full Mattress Need?
When researching what size is full mattress, it also helps to think about room layout.
Beyond the mattress itself, consider:
- Bed frame size: A frame can add a few extra inches in both directions.
- Walkways: Many people prefer at least 24–30 inches of space on the sides for easy movement.
- Other furniture: Dressers, nightstands, and desks all reduce usable floor space.
📝 Simple planning tip:
Measure your room, subtract the mattress width and length, and see how much clear space remains for walking and furniture.
What Bedding Fits a Full Mattress?
Because a full is a standard size, bedding is usually easy to find:
- Full-size fitted sheets are designed for 54" x 75" mattresses, with varying pocket depths for different mattress heights.
- Flat sheets, blankets, and comforters labeled “full” or “full/queen” generally work, but full/queen comforters may hang lower on the sides.
- A full mattress protector or topper should also match the 54" x 75" footprint.
If your mattress is especially thick, checking the sheet’s pocket depth can help ensure a good fit.
How Is a Full Different From a Full XL?
A standard full and a full XL differ in length:
- Full: 54" x 75"
- Full XL: 54" x 80"
A full XL keeps the same width but adds extra length, which can be helpful for taller sleepers. Full XL is less common than standard full, so sheets and accessories may be harder to find.
✔️ Quick Mattress Takeaways
Key points consumers should understand about “What Size Is Full Mattress”
- Standard full mattress size:54" wide x 75" long (about 137 cm x 191 cm).
- Full = double: These terms usually refer to the same mattress size.
- Best for: Single adults, teens, and guest rooms where space is limited.
- For couples: Possible, but many find it tight for everyday use.
- Room fit: Works well in smaller bedrooms or studios, leaving more open floor space than a queen.
- Full vs queen: A queen is wider and longer, offering more comfort for two people.
- Full XL option: Same width, 5 inches longer, but not as widely available.
- Bedding: Look for full-size sheets and protectors; full/queen comforters can also fit, with more overhang.
Understanding what size is full mattress helps you match your bed to your room, your sleeping needs, and your budget more confidently.
