by A full mattress measures 54 inches wide by 75 inches long (4 feet 6 inches x 6 feet 3 inches). Also called a double mattress, it sits in the middle of the size range — 16 inches wider than a twin but 6 inches narrower than a queen. This page covers who benefits from full size, minimum room requirements, and the full-vs-queen decision most buyers face.
Our Top Pick in full: Saatva Classic
The Saatva Classic is our highest-rated innerspring hybrid — available in multiple firmness levels, free white-glove delivery, and a 365-night trial. It fits standard frames and is available in every size including full.
Full Mattress Dimensions at a Glance
| Measurement | Inches | Feet | Centimeters |
|---|---|---|---|
| Width | 54" | 4'6" | 137 cm |
| Length | 75" | 6'3" | 191 cm |
| Typical thickness | 9–14" | — | 23–36 cm |
Who Benefits from a Full Size Mattress?
Full mattresses are the right choice in specific situations:
- Single sleepers in smaller rooms — The 54-inch width gives a solo adult comfortable space without dominating a small bedroom
- Guest bedrooms — Full is the most practical guest bed: wider than a twin for adult comfort, smaller footprint than a queen
- Teen bedrooms — More room to grow into than a twin without requiring a queen-size room
- Budget-conscious buyers — Full mattresses cost less than queens for the same model, and full bedding is widely available
Full vs. Queen: The Decision Framework
| Factor | Full (54"x75") | Queen (60"x80") |
|---|---|---|
| Solo sleeper | Plenty of room | More than enough |
| Couple | 27" per person — tight | 30" per person — adequate |
| Taller sleepers (5'10"+) | Feet may hang off (75") | Better fit (80") |
| Room size needed | 9x9.5 ft minimum | 10x10 ft minimum |
| Typical price difference | Base price | +$100–$300 more |
The most common mistake is buying a full for a couple to save money. At 27 inches per person, both sleepers will feel the constraint within a few nights. If budget allows, the queen is almost always worth it for couples. For detailed queen measurements, see our queen mattress dimensions page.
Our guide on whether two people can sleep on a full bed goes deeper on this question with real-world data.
Minimum Room Size for a Full Bed
- Minimum: 9 x 9.5 feet — the bed fits with basic clearance
- Comfortable with furniture: 10 x 10 feet — allows a dresser and nightstand
- Shared teen room with desks: 10 x 12 feet
Full Mattress Size vs. Other Sizes
| Size | Width | Length | vs. Full |
|---|---|---|---|
| Twin | 38" | 75" | 16" narrower, same length |
| Full | 54" | 75" | — |
| Queen | 60" | 80" | 6" wider, 5" longer |
| King | 76" | 80" | 22" wider, 5" longer |
For a complete reference with all sizes and room requirements, see our standard bed sizes guide.
Our Top Pick in full: Saatva Classic
The Saatva Classic is our highest-rated innerspring hybrid — available in multiple firmness levels, free white-glove delivery, and a 365-night trial. It fits standard frames and is available in every size including full.
Frequently Asked Questions
What are the exact dimensions of a full mattress?
A full mattress measures 54 inches wide by 75 inches long (137 cm x 191 cm). It is also called a double mattress.
Is a full mattress big enough for two people?
Technically yes, but each person only gets 27 inches — less than a twin. Most experts recommend a queen or larger for couples.
What is the minimum room size for a full bed?
A full bed fits comfortably in a room as small as 9 x 9.5 feet. For a room with a dresser and nightstand, 10 x 10 feet is more practical.
What is the difference between full and queen size?
A queen is 6 inches wider (60" vs 54") and 5 inches longer (80" vs 75") than a full. For couples or taller sleepers, the queen upgrade is usually worth the extra cost.
Do full and twin sheets fit the same mattress?
No. Full sheets are wider than twin sheets. Full fitted sheets are designed for a 54x75 inch mattress. Twin sheets will leave the sides of a full mattress uncovered.
Key Takeaways
- Full Mattress Dimensions at a Glance: a key factor in making the right sleeping decision.
- Who Benefits from a Full Size Mattress?: a key factor in making the right sleeping decision.
- A full mattress measures 54 inches wide by 75 inches long (4 feet 6 inches x 6 feet 3 inches).
- Also called a double mattress, it sits in the middle of the size range — 16 inches wider than a twin but 6 inches narrower than a queen.
- This page covers who benefits from full size, minimum room requirements, and the full-vs-queen decision most buyers face.
Our Top Pick: Saatva Classic
Voted best luxury innerspring mattress with exceptional lumbar support and white-glove delivery.
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