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Mattress size lookup
Pick a size for full specs, or enter a room width to see what fits.
REFERENCE TABLE · EVERYDAY · HOME
Mattress Sizes Chart
Every standard US mattress size in one printable chart — twin through California king — with inches, centimeters, floor space, and the room each size needs. Pick a size below for the full specs, or enter your room’s width to see which beds fit with walking space on both sides.
The full chart
Standard US mattress dimensions. Manufacturers vary by about ±1 inch, so measure your frame and bedding before ordering:
| Size | Inches (W × L) | cm | Floor space | Min. room | Best for |
|---|---|---|---|---|---|
| Crib / Toddler | 28×52 in | 71×132 cm | 10.1 sq ft | — | Infants & toddlers |
| Twin / Single | 38×75 in | 97×190 cm | 19.8 sq ft | 8×10 ft | Kids, bunk beds & daybeds |
| Twin XL | 38×80 in | 97×203 cm | 21.1 sq ft | 8×10 ft | College dorms & taller single sleepers |
| Full / Double | 54×75 in | 137×190 cm | 28.1 sq ft | 10×10 ft | Single adults & guest rooms |
| Queen | 60×80 in | 152×203 cm | 33.3 sq ft | 10×12 ft | Couples — the most popular US size |
| King / Eastern King | 76×80 in | 193×203 cm | 42.2 sq ft | 12×12 ft | Couples who want maximum space |
| California King | 72×84 in | 183×213 cm | 42.0 sq ft | 12×12 ft | Taller couples (extra legroom, narrower) |
The two kings trip people up: the standard king (76×80) is wider, the California king (72×84) is longer and narrower — pick the Cal king if anyone sleeping on it is over 6 feet tall.
Output · formula · meaning
| Output | Formula | What it means |
|---|---|---|
| Mattress dimensions | standard nominal size | The footprint your bed, frame, and sheets must fit — e.g. queen 60×80″. |
| Room-fit list | bed width + 48″ ≤ room width | Every size that fits with ~24″ of walking space on each side of the bed. |
| Minimum room | bed + walking space | The smallest room that keeps the bed usable — e.g. 10×12 ft for a queen. |
Who uses this
- The apartment mover checking whether a queen fits the 10-foot bedroom wall with nightstands on both sides.
- The guest-room setter choosing between a full and a queen for a 10×10 room.
- The dorm shopper confirming Twin XL (38×80) sheets — regular twin sheets come up 5 inches short.
- The couple upgrading deciding king vs California king on width-vs-length.
Accuracy & limitations
These are the industry-standard nominal sizes; actual mattresses vary ±1 inch by brand, and pillow-top or Euro-top models add height, not footprint. Room recommendations assume about 24 inches of walking space on each side of the bed — tight for dressers and doors, so measure twice. RV, Olympic queen (66×80), and Alaskan king sizes are specialty sizes and intentionally left off this standard chart.
Cite this reference chartBright Side Kit. “Mattress Sizes Chart.” brightoolbox.com, 2026.
Bright Side Kit. "Mattress Sizes Chart." https://brightoolbox.com/mattress-sizes-chart/ Accessed October 22, 2026.Frequently asked questions
What is the difference between a king and a California king?
A standard (Eastern) king is 76″ wide × 80″ long; a California king is 72″ wide × 84″ long — 4 inches narrower, 4 inches longer. The Cal king suits taller sleepers; the standard king suits couples who want maximum width. Sheets are not interchangeable.
What size is a twin XL mattress?
38″ × 80″ — the width of a twin with the length of a queen. It’s the standard college dorm size, which is why Twin XL sheets exist as their own product. Regular twin sheets (38×75) come up about 5 inches short.
Can two adults sleep on a full-size mattress?
It’s tight: a full is 54 inches wide, giving each sleeper 27 inches — narrower than a twin. Fine for smaller couples and great for guest rooms, but most couples who try a full nightly upgrade to a queen (60″) within a year or two.
What room size do I need for a queen bed?
A queen is 60×80 inches; plan on a 10×12-foot room minimum to keep ~24 inches of walking space on three sides. For a king, step up to 12×12 feet. Enter your room width in the lookup above for the exact fit list.
Do mattress sizes vary by brand?
Slightly — about ±1 inch on width and length between manufacturers. Fitted sheets have enough stretch to absorb it, but rigid frames and platform beds don’t: measure the actual mattress (or the frame’s interior) before buying the other.
What are the dimensions of a crib mattress?
The US standard crib mattress is 28″ × 52″ (about 71 × 132 cm). Federal rules require it to fit snugly — no more than two fingers of gap between mattress and crib side — so stick to the standard size.