Full Size Mattress Dimensions
Quick answer: a Full size mattress — also called a Double — is 54 inches wide × 75 inches long: 137 × 191 cm, or 4.5 × 6.3 feet. It sits between a Twin and a Queen: wide enough for one adult to spread out, and a tight squeeze for two.
Short answer: Full size mattress dimensions are 54 inches wide × 75 inches long (137 × 191 cm, 4.5 × 6.3 ft). “Full” and “Double” are two names for the same bed. It fits rooms from about 9 × 10 ft, sleeps one adult comfortably, and gives two sleepers a snug 27 inches each.
Full Mattress Dimensions Chart
| Measurement | Inches | Centimeters | Feet |
|---|---|---|---|
| Width | 54″ | 137 cm | 4.5 ft |
| Length | 75″ | 191 cm | 6.3 ft |
| Surface area | 4,050 sq in | 2.61 m² | 28.1 sq ft |
| Space per sleeper (2 people) | 27″ wide | 69 cm | 2.25 ft |
A Full frame’s inside should measure at least 54″ × 75″; overall frame width is typically 57–60 inches with rails and headboard. Note the length: at 75 inches, a Full is 5 inches shorter than a Queen or King — tall sleepers should read the comparison below before buying.
Our figures match the standard dimensions in the Sleep Foundation’s mattress sizes guide, which lists the Full/Double at the same 54″ × 75″.
Full, Double, or 53 Inches Wide? Clearing Up the Names
The Full is the most confusingly named size in the chart. “Full” and “Double” are exact synonyms — older bedding and many hotels still say Double — and both mean the modern standard of 54″ × 75″. The confusion comes from older stock: some vintage and imported “double” beds were built 53 inches wide (and a few listings still quote 53″ × 75″), a leftover from pre-standard sizing. One inch sounds trivial until a 54-inch fitted sheet is stretched over a 53-inch frame’s mattress, or the reverse leaves a loose, shifting fit. The rule is simple: measure the mattress you actually own across its widest point. If it measures 54 inches, buy Full bedding with confidence. If it measures 53, look for brands that publish exact pocket dimensions, and expect a slightly loose fit from standard Full sheets.
The Sleep Foundation’s Twin XL vs Full comparison is a useful cross-check on who the Full suits: single sleepers who want more width than a Twin.
Full vs Queen
A Queen is 60″ × 80″ — 6 inches wider and 5 inches longer than a Full. For couples that difference is decisive, which is why Queens outsell Fulls for master bedrooms. Our dedicated Full vs Queen comparison breaks down space, price and room fit, and the mattress sizes chart shows every size side by side.
For the full head-to-head — width per sleeper, length, price and room fit — read our dedicated Full vs Queen comparison.
Who Should Buy a Full?
- Single adults who find a Twin too narrow but lack room for a Queen.
- Teenagers — a generous bed that still fits a smaller bedroom (9 × 10 ft is enough).
- Guest rooms — comfortable for one visitor, workable for two on short stays.
- Studio apartments — real-bed comfort without Queen-sized floor space.
For a younger child or a bunk setup, step down to the Twin size (38″ × 75″) instead — a Full is wider than a growing child needs and costs more to dress.
Couples under about 5 ft 6 in sometimes share a Full, but at 27 inches per person it is tighter than a crib is for a baby — most couples should step up to a Queen.
Minimum Room Size for a Full Bed
A Full mattress is 54″ × 75″; with a typical frame the bed’s footprint grows to roughly 57″ × 80″. In a 9 × 10 ft room that leaves about 24 inches of walkway across the width and a comfortable margin at the foot — enough for a nightstand and a small dresser. An 8 × 10 ft room works if the bed sits against the long wall and you accept a walkway on one side only. This is exactly why the Full is the default guest-room size: it hosts one visitor in real comfort (or a couple for a short stay), yet leaves the room usable as an office or nursery the other 350 days a year. If the guest room is 10 × 10 ft or larger and couples visit often, that is the point where a Queen earns its floor space instead.
Buying the frame too? Our bed frame sizes chart shows the overall frame dimensions to plan your room around.
Related Mattress Size Guides
- Queen Size Mattress Dimensions — 60″ × 80″, the step up
- Twin Size Mattress Dimensions — 38″ × 75″, the step down
- Full vs Queen — the head-to-head decision
- Mattress Size Guide & Finder — pick a size in three questions
Still weighing a Full against a Queen or a Twin XL for the same room? The mattress size finder gives a recommendation from your room size and height.
Frequently Asked Questions
What are the dimensions of a full size mattress?
54 inches wide by 75 inches long (137 × 191 cm, or 4.5 × 6.3 feet).
Is a full bed the same as a double bed?
Yes — Full and Double are the same size with two names.
Can two people sleep on a full bed?
They can, but each person gets only 27 inches of width. It works for short stays; couples sleeping every night usually prefer a Queen.
Do queen sheets fit a full mattress?
No — Queen sheets (60″ × 80″) are too wide and too long and will bunch. Use Full sheets.
What room size does a full bed need?
A room of about 9 × 10 ft or larger leaves comfortable walking space around a Full bed.
Sources: Sleep Foundation — Mattress Sizes guide; Sleep Foundation — Twin XL vs Full.