Bed Size Chart: Mattress Sizes and Real Bed Frame Dimensions (2026)
A queen mattress is 60" x 80". The bed you put it on is not. Mattress sizes are one of the few true standards in a bedroom, and the Better Sleep Council puts a queen at 60" wide by about 80" long and a king at 76" x 80". The frame is what decides whether a bed fits the room. Across the 186 bed frames in the AURA catalog, the median frame runs 6.5" wider and 7" longer than the mattress it holds.
Two pairs of numbers get mixed up all the time. The first is nominal size against actual size: Sealy lists its Posturepedic Hybrid queen at 60" x 79", a full inch shorter than the 60" x 80" on its own size guide. The second is king against California king. The California king is longer and narrower, and the standard king still covers more of the mattress surface.
This page gives the mattress dimensions for every standard size, the floor a real frame takes, the smallest room each bed fits with walking space, nightstand heights, and a calculator for your own room. Every outside figure links to its source. The catalog figures come from our own listings, pulled October 21, 2026, and the full dataset is free to download.
In short: the standard US mattress sizes are twin 38" x 75", twin XL 38" x 80", full 53" x 75", queen 60" x 80", king 76" x 80" and California king 72" x 84", per the Better Sleep Council. In AURA's 2026 catalog of 186 bed frames, the median frame is 6.5" wider and 7" longer than its mattress, so a typical queen bed covers about 66" x 87" of floor and a typical king about 82.5" x 87".
What Are the Standard Bed Sizes and Dimensions?
Mattress dimensions barely move from brand to brand, but frame dimensions move a lot, so this chart carries both, plus the room each size needs once you leave 30" to walk around it.
| Bed size | Mattress (W x L) | Mattress area | Median AURA frame (W x L) | Smallest room, 30" clearance | Source (date) |
|---|---|---|---|---|---|
| Crib (full size) | at least 27 1/4" x 51 5/8" | 9.8 sq ft | n/a | n/a | 16 CFR 1241.2 (2026) |
| Twin | 38" x 75" | 19.8 sq ft | 48" x 82" (n=3, rounded) | 9 ft x 9 ft 4 in | Better Sleep Council (2024) |
| Twin XL | 38" x 80" | 21.1 sq ft | n/a | n/a | Better Sleep Council (2024) |
| Full | 53" x 75" (Sealy lists 54" x 75") | 27.6 sq ft | n/a | n/a | Better Sleep Council (2024); Sealy (2022) |
| Queen | 60" x 80" | 33.3 sq ft | 66.25" x 87" (n=87) | 10 ft 6 in x 9 ft 9 in | Better Sleep Council (2024) |
| King | 76" x 80" | 42.2 sq ft | 82.5" x 87" (n=91) | 11 ft 10.5 in x 9 ft 9 in | Better Sleep Council (2024) |
| California king | 72" x 84" | 42.0 sq ft | 76.5" x 91.25" (n=5) | 11 ft 4.5 in x 10 ft 1 in | Better Sleep Council (2024) |
| Split king | two 38" x 80" (Sealy Posturepedic Spring and Icon: 38" x 79.5" each) | 42.2 sq ft | uses a king frame | same as king | Better Sleep Council (2024); Sealy |
| Split California king | two 36" x 83.5" (Sealy Posturepedic Spring and Icon) | n/a | uses a California king frame | same as California king | Sealy |
Frame figures are medians of the listed frame dimensions for active beds in the AURA catalog, pulled October 21, 2026 via Shopify (186 frames; headboard-only listings, one listing with no dimensions and two whose listed frame was no larger than the mattress were excluded). Room sizes add 30" on both sides and at the foot of the median frame and are rounded to the nearest half inch. Areas are width x length.
Download the full dataset (CSV): every figure on this page with its source, unit and date, free to reuse under CC BY 4.0.
A few notes the chart cannot hold. Mattress makers round. Beautyrest says bed sizes are universal to within about an inch, and the full is where sources disagree on width: the Better Sleep Council lists it at 53" wide, while Sealy's guide gives 54". Mattress thickness is its own variable. Tempur-Pedic lists its mattresses at 10" to 13" tall, and that height sits on top of whatever the frame adds.
Cribs and bunk beds are the two places where size is law rather than habit. A full-size crib mattress must measure at least 27 1/4" x 51 5/8" under federal rules, and a bunk bed guardrail has to stand at least 5" above the top of the mattress. A thicker mattress on a bunk eats that margin.
Will This Bed Size Fit My Room? (Bed Fit Calculator)
Enter the room and the bed. The calculator adds the frame, the walking space and the nightstands, then tells you what is left over.
Frame allowances are medians from 186 bed frames in the AURA catalog (October 2026). Walking space options come from the ADA 2010 Standards, sections 305.3 and 403.5.1. The calculator checks the bed against both walls in both directions.
King vs California King: Which Is Bigger?
The king is wider and the California king is longer, and the king wins on total surface. A king measures 76" x 80", which is 6,080 square inches. A California king measures 72" x 84", which is 6,048. That is 32 square inches in the king's favor, about half a percent, so neither one is the bigger bed in any way you would feel.
What you do feel is the shape. The extra 4" of length helps anyone over six feet whose feet hang past the edge, and the extra 4" of width helps two people and a dog. In a room, the California king also asks for 4" more length between the headboard wall and the foot of the bed, before the 30" walkway even starts.
A split king is two twin XL mattresses side by side. Two 38" x 80" twin XLs make 76" x 80", the exact footprint of a king, so each sleeper gets a mattress of their own on the same frame. Sealy's Posturepedic Spring and Icon lines build split king halves at 38" x 79.5" each and split California king halves at 36" x 83.5".
How Big a Room Does Each Bed Size Need?
The building code sets the floor. Under the International Residential Code, a habitable room needs at least 70 square feet and at least 7 feet in every direction. A median king frame from our catalog covers 49.6 square feet on its own, which is 71% of that minimum room before you add a single walkway.
For walking space I use 30" on both sides and at the foot. That figure is the width of the clear floor space the ADA standards require beside both sides of a bed in an accessible hotel guest room. If anyone in the house uses a wheelchair or walker, plan for the ADA's 36" accessible route instead.
With 30" of clearance, the smallest workable footprint for a median queen frame is 10 ft 6 in by 9 ft 9 in, about 103 square feet. A median king needs 11 ft 10.5 in by 9 ft 9 in, about 116 square feet. A California king, from a smaller sample of five frames, needs 11 ft 4.5 in by 10 ft 1 in. Those numbers are estimates built from real frames, not mattresses, which is why they run larger than a mattress-only chart would suggest.
The easy mistake is measuring the room against the mattress. A king mattress is 76" wide. The king frames we sell run from 78.5" to 92.5" wide, and a 92.5" frame in an 11 ft room leaves you under 20" on each side. That is under the 30" I plan for, and too little to open a nightstand drawer while someone stands there.
How Much Bigger Is a Bed Frame Than the Mattress?
Usually 6" to 7" in each direction, and sometimes far more. I pulled every active bed in the AURA catalog on October 21, 2026, removed two headboard-only listings, one with no dimensions and two whose listed frame was no larger than the mattress, and compared the remaining 186 frames to the standard mattress for their size. The median frame adds 6.5" of width and 7" of length. About three in four frames add at least 6" of length. The biggest overages in the catalog are 16.75" of width and 17" of length. A median queen frame covers 39.7 square feet against the mattress's 33.3, an extra 19%, and a median king covers 49.6 against 42.2, an extra 17%.
The style of frame decides most of it. In our catalog, the modern platform beds are the leanest, adding a median 5" of width to a queen or king. Storage beds with gas lifts add about 9". Frames with upholstered or carved headboards land in between at about 6.5", and the extra inches buy silhouette: a tall upholstered headboard pulls the eye up and makes a low ceiling read higher in lamplight.
If floor space is the constraint, look for a thin edge and a raised base. Mid century modern beds on legs let the floor show underneath, so the bed reads lighter than its footprint even when the numbers are the same. Low japandi platform beds take the opposite approach: they sit close to the floor, which grounds a room and shows the whole footprint.
Price follows size. Across our modern luxury beds, the median queen lists at $2,399 and the median king at $2,829, a difference of $430 or 18%. Bedroom furniture has also gotten cheaper over the past year: the BLS consumer price index for bedroom furniture fell 3.7% in the twelve months to September 2026.
What Is the Right Nightstand Height for a Bed?
Close to the top of the mattress, within a few inches either way. Across 111 nightstands in our catalog, the median stands 24" tall and the middle half fall between 21.4" and 26.6". A low platform bed with a 10" mattress usually wants the shorter end of that range. A tall upholstered bed on a box spring wants the taller end, or a lamp tall enough to make up the difference.
Width is the number people forget. The median nightstand in our catalog is 24" wide, so a queen frame with a pair of them needs a headboard wall of 9 ft 6.25 in, and a king needs 10 ft 10.5 in. If your wall is shorter, choose narrower nightstands before you size the bed down, because a bed squeezed between two wide tables looks cramped even when it technically fits.
Which Bed Size Is Most Popular?
The queen. The Better Sleep Council calls it today's most popular mattress size, and larger sizes are gaining. The International Sleep Products Association's 2026 industry report found that a shift toward bigger mattresses raised the average unit value even as unit shipments fell 13.2% and total market value fell 6.5% in 2025.
Sharing drives the size. Nearly two-thirds of adults share a bed with a partner at least once a week, according to a Better Sleep Council survey. Moving up a size usually means retiring an old mattress, and the Mattress Recycling Council reports that up to 75% of a mattress can be recycled.
How to Cite This Bed Size Chart
Free to use with a link to this page.
AURA Modern Home (2026). Bed Size Chart: Mattress Sizes and Real Bed Frame Dimensions (2026). https://auramodernhome.com/pages/bed-size-chartThe data on this page is licensed under CC BY 4.0. Credit AURA Modern Home and link to this page.
Mattress sizes are close to a fixed standard, so the size you choose matters less than the frame you put it on. Measure the room against the frame, leave 30" to walk, and check the headboard wall for nightstands before anything ships. A queen in the right frame will look better than a king that fills the room edge to edge.
Sources
Sealy Help Center: What are the mattress dimensions? · Sealy: The Ultimate Mattress Size Guide · Better Sleep Council: Mattress Sizes · Beautyrest: Mattress/Bed Size Dimensions Guide · Tempur-Pedic Help Center: How tall are Tempur-Pedic mattresses? · eCFR: 16 CFR 1241.2 · eCFR: 16 CFR 1513.3 (bunk beds) · ISPA: 2026 Mattress Industry Trends Report overview (2026) · Better Sleep Council: Sleep and Partners Research 2023 (2023) · Mattress Recycling Council: 10 Year Impact Report (2025) · BLS: Consumer Price Index News Release (PDF), September 2026 (2026) · BLS CPI news release Table 2, September 2026 (2026) · ICC 2021 International Residential Code, Chapter 3 (2021) · US Access Board: 2010 ADA Standards 806.2.3 (2010) · AURA Modern Home catalog, 186 bed frames and 111 nightstands (October 21, 2026)
Last updated October 2026. Method: we opened 31 source pages, kept only figures from primary sources (manufacturers, industry associations, federal agencies and code bodies), and computed every catalog figure from a live pull of active AURA listings. We re-check every figure at least once a year.