Fashion & Sizes
Bed Size Chart: Mattress Dimensions, Conversions and Room Fit
Compare common US, UK, European, and Australian mattress sizes. Convert dimensions, check sleeper length, plan furniture clearance, and test the room with a browser-based fit calculator.
Mattress sizes are nominal and regional. Product tolerances, frame overhang, bedding depth, and specialty sizes vary. Confirm the manufacturer's exact specification before buying and see the disclaimer.
Choose a bed by exact dimensions, not by the name alone
Start with the regional mattress footprint. Then check sleeper height, shared width, the frame's outside size, usable room aisles, doors, storage, and the delivery path. A king, queen, double, or single can mean a different size in another country.
Regional systems
US · UK · EU · AU
The same bed name can represent different dimensions by market.
Always compare
width × length
Exact measurements are safer than labels when buying frames or bedding.
Room fit
frame + clear aisles
Use the outer frame and account for doors, drawers, and furniture.
Reference coverage
18 tables
149 rows cover dimensions, conversions, room planning, examples, and mistakes.
Fast answers for common bed-size questions
What size is a US queen bed?
A standard US queen mattress is about 60 × 80 inches.
What size is a US king bed?
A standard US king mattress is about 76 × 80 inches.
What size is a California king?
A California king is about 72 × 84 inches.
Is California king bigger than king?
It is longer but narrower: 4 inches longer and 4 inches narrower.
Do two Twin XL beds make a king?
Two US Twin XL mattresses make an approximate 76 × 80 inch king footprint.
Are full and double the same in the US?
Yes. Full and double usually describe the same nominal US size.
Are UK and US king beds the same?
No. A UK king is 150 × 200 cm, while a US king is about 193 × 203 cm.
What is a common European double size?
A widely sold metric double footprint is 140 × 200 cm, but labels vary.
What is an Australian queen size?
An Australian queen is about 152.5 × 203 cm.
How much longer should a bed be than the sleeper?
A useful first screen is about 10 cm of extra mattress length.
Should I measure the bed frame or mattress?
Measure both: the mattress for compatibility and the outer frame for room fit.
Can I buy sheets by size name internationally?
No. Match exact width, length, and pocket depth instead.
Three-part sizing model
Match the mattress, the frame, and the usable room
A bed-size label is only a starting point. The exact mattress footprint, frame overhang, sleeper height, furniture, and delivery route determine whether a bed actually works.
Measure the product
width × length
Use exact mattress and outer-frame dimensions, not the name alone.
Measure the room
clear floor area
Include door swings, drawers, wardrobes, and bedside furniture.
Test the fit
sleep space + aisles
Check height allowance, personal width, and usable circulation space.
Compare regional mattress dimensions first
US mattress size chart
Common US mattress dimensions. Values are nominal and a finished product may vary slightly by maker.
Swipe horizontally inside the table to view every column.
| US size | Dimensions | Metric equivalent | Mattress area | Typical use |
|---|---|---|---|---|
| Twin | 38 × 75 in | 96.5 × 190.5 cm | 19.8 sq ft | One child or compact single-sleeper room |
| Twin XL | 38 × 80 in | 96.5 × 203.2 cm | 21.1 sq ft | Tall single sleeper, dorm, or split-king half |
| Full / Double | 53 × 75 in | 134.6 × 190.5 cm | 27.6 sq ft | Roomy solo use; tight for two adults |
| Queen | 60 × 80 in | 152.4 × 203.2 cm | 33.3 sq ft | Common couple or spacious solo choice |
| King | 76 × 80 in | 193.0 × 203.2 cm | 42.2 sq ft | Maximum standard US width for two |
| California King | 72 × 84 in | 182.9 × 213.4 cm | 42.0 sq ft | Extra length with slightly less width than king |
Width × length
- • Dimensions are mattress dimensions, not outer bed-frame dimensions.
- • Better Sleep Council describes its listed US dimensions as approximate.
- • Measure the actual product before ordering a frame, sheets, protector, or moving service.
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UK mattress size chart
Standard UK and selected IKEA child or day-bed sizes. UK names do not map directly to US names.
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| UK label | Centimetres | Approx. inches | Typical use | Compatibility note |
|---|---|---|---|---|
| Small single / day bed | 80 × 200 cm | 31.5 × 78 in | Special compact or extendable frame | Check the exact branded frame |
| Junior | 90 × 200 cm | 36 × 78 in | Children, bunks, and loft beds | Not the same length as UK single |
| UK single | 90 × 190 cm | 36 × 75 in | One sleeper | Standard adult single width |
| Small double | 120 × 190 cm | 47 × 75 in | Spacious solo or compact couple use | Also called three-quarter by some sellers |
| UK double | 135 × 190 cm | 54 × 75 in | Two sleepers in a moderate room | Shorter than UK king |
| UK king | 150 × 200 cm | 60 × 78 in | Two sleepers with extra length | Name differs from US king |
| UK super king | 180 × 200 cm | 71 × 78 in | Wide couple bed | Close to a common European 180 × 200 size |
Width × length
- • UK single, double, and small double are 190 cm long; UK king and super king are 200 cm long.
- • European sizes differ from standard UK sizes even when a retail label sounds similar.
- • Always match the printed mattress dimensions to the frame opening.
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Common European metric bed sizes
Widely sold metric mattress footprints used across many European markets. Retail names vary, so dimensions matter more than labels.
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| Indicative label | Centimetres | Approx. inches | Practical description |
|---|---|---|---|
| Compact single | 80 × 200 cm | 31.5 × 78.7 in | Narrow single, day bed, or child frame |
| Single | 90 × 200 cm | 35.4 × 78.7 in | Common metric single |
| Double | 140 × 200 cm | 55.1 × 78.7 in | Compact two-person metric size |
| Large double | 160 × 200 cm | 63.0 × 78.7 in | Often marketed as king in some countries |
| Extra-large double | 180 × 200 cm | 70.9 × 78.7 in | Often marketed as super king in some countries |
Width × length
- • There is no single international naming standard for mattress sizes.
- • A 160 × 200 cm mattress may be called a double, queen, or king depending on country and seller.
- • Use the exact centimetre dimensions when buying cross-border.
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Australian mattress size chart
Australian single through super king dimensions from Sealy Australia.
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| Australian size | Millimetres | Centimetres | Approx. inches | Typical use |
|---|---|---|---|---|
| Single | 915 × 1900 mm | 91.5 × 190 cm | 36 × 74.8 in | One child, teen, or compact solo room |
| Single XL | 915 × 2030 mm | 91.5 × 203 cm | 36 × 80 in | Tall solo sleeper |
| King single | 1055 × 2030 mm | 105.5 × 203 cm | 41.9 × 80 in | Wider long single |
| Double | 1385 × 1900 mm | 138.5 × 190 cm | 54.5 × 74.8 in | Spacious solo or compact two-person use |
| Queen | 1525 × 2030 mm | 152.5 × 203 cm | 60 × 80 in | Common adult and couple size |
| King | 1835 × 2030 mm | 183.5 × 203 cm | 72.2 × 80 in | Wide couple bed |
| Super king | 2030 × 2030 mm | 203 × 203 cm | 80 × 80 in | Square extra-large bed |
Width × length
- • Sealy states that its handmade mattresses may vary by ±15 mm from the guide.
- • Australian king is narrower than a standard US king but has a similar nominal length.
- • Check the exact brand specification before mixing a mattress, base, and fitted sheet.
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Bed size names across regions
A naming map for common search terms. It is a label guide, not a promise of equal dimensions.
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| Search term | United States | United Kingdom | Common Europe | Australia | Main caution |
|---|---|---|---|---|---|
| Single | Usually twin: 38 × 75 in | 90 × 190 cm | Often 90 × 200 cm | 91.5 × 190 cm | Same label, different lengths and widths |
| Double | Usually full: 53 × 75 in | 135 × 190 cm | Often 140 × 200 cm | 138.5 × 190 cm | US full and UK/AU double are not identical |
| Queen | 60 × 80 in | Not a core UK standard name | Often seller-specific; 160 × 200 cm may be compared | 152.5 × 203 cm | Do not assume one global queen footprint |
| King | 76 × 80 in | 150 × 200 cm | Often 160 × 200 cm | 183.5 × 203 cm | US king is much wider than UK king |
| Super king | Seller-specific specialty label | 180 × 200 cm | Often 180 × 200 cm | 203 × 203 cm | Australian super king is larger and square |
| California king | 72 × 84 in | No direct standard equivalent | No direct standard equivalent | No direct standard equivalent | It is longer but narrower than US king |
- • Treat names as regional marketing labels, not universal measurements.
- • When replacing only one part, read the old mattress label and measure it.
- • Cross-border bedding should be selected by width, length, and mattress depth.
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Compare area, personal width, and sleeper length
US mattress area and width per sleeper
Derived comparisons for standard US sizes. Width per sleeper assumes two people share the mattress.
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| Size | Width | Length | Area | Width each for two | Difference from queen |
|---|---|---|---|---|---|
| Twin | 38 in | 75 in | 19.8 sq ft | 19 in | 22 in narrower; 5 in shorter |
| Twin XL | 38 in | 80 in | 21.1 sq ft | 19 in | 22 in narrower; same length |
| Full / Double | 53 in | 75 in | 27.6 sq ft | 26.5 in | 7 in narrower; 5 in shorter |
| Queen | 60 in | 80 in | 33.3 sq ft | 30 in | Reference size |
| King | 76 in | 80 in | 42.2 sq ft | 38 in | 16 in wider; same length |
| California King | 72 in | 84 in | 42.0 sq ft | 36 in | 12 in wider; 4 in longer |
Nominal mattress dimensions; derived arithmetic
- • Area equals width × length and is rounded to one decimal square foot.
- • Width per sleeper is a simple division, not a comfort guarantee.
- • A US king offers about the width of one twin to each of two sleepers.
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Mattress length and sleeper-height guide
A simple length check using a 10 cm allowance beyond body height, as suggested in IKEA guidance.
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| Mattress length | Approx. inches | Maximum height with 10 cm allowance | Example sizes | Interpretation |
|---|---|---|---|---|
| 190 cm | 74.8 in | 180 cm / 5 ft 11 in | US twin/full; UK single/double; AU single/double | May feel short for taller adults |
| 200 cm | 78.7 in | 190 cm / 6 ft 3 in | UK king; common European sizes | Common long metric length |
| 203 cm | 79.9 in | 193 cm / 6 ft 4 in | AU XL/queen/king | Close to US 80-inch length |
| 80 in | 203.2 cm | 193.2 cm / 6 ft 4 in | US twin XL/queen/king | Adds 5 inches over US twin/full |
| 84 in | 213.4 cm | 203.4 cm / 6 ft 8 in | US California king | Longest common standard US option |
Length is mattress length
- • Subtracting 10 cm provides a quick height screen, not a universal ergonomic rule.
- • Pillow position, sleep posture, foot position, and frame design affect usable length.
- • Measure the sleeper while lying naturally when length is a close decision.
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Deterministic browser-only tool
Bed Size and Room Fit Calculator
Choose a region, enter the clear room dimensions, set a preferred aisle target, and add the tallest sleeper. The calculator compares every listed mattress in both orientations and shows physical fit, target-clearance fit, height allowance, and width per sleeper.
Largest result meeting both screens
King
King
76.0 × 80.0 in
- Orientation
- standard
- Width each
- 38.0 in
- Side clearance
- 34.0 in
- Foot clearance
- 64.0 in
- Height screen
- Passes with 8.0 in extra length
California King
72.0 × 84.0 in
- Orientation
- standard
- Width each
- 36.0 in
- Side clearance
- 36.0 in
- Foot clearance
- 60.0 in
- Height screen
- Passes with 12.0 in extra length
Queen
60.0 × 80.0 in
- Orientation
- standard
- Width each
- 30.0 in
- Side clearance
- 42.0 in
- Foot clearance
- 64.0 in
- Height screen
- Passes with 8.0 in extra length
Full / Double
53.0 × 75.0 in
- Orientation
- standard
- Width each
- 26.5 in
- Side clearance
- 45.5 in
- Foot clearance
- 69.0 in
- Height screen
- Short by 0.9 in against the 10 cm screen
Twin XL
38.0 × 80.0 in
- Orientation
- standard
- Width each
- 19.0 in
- Side clearance
- 53.0 in
- Foot clearance
- 64.0 in
- Height screen
- Passes with 8.0 in extra length
Twin
38.0 × 75.0 in
- Orientation
- standard
- Width each
- 19.0 in
- Side clearance
- 53.0 in
- Foot clearance
- 69.0 in
- Height screen
- Short by 0.9 in against the 10 cm screen
How to use it
Enter the clear room rectangle before furniture, then choose the aisle target and tallest sleeper.
Why it helps
It exposes label differences and shows which exact regional footprints fit the same room.
Tool boundary
It uses mattress dimensions only. Add frame overhang, furniture, doors, access needs, and manufacturer tolerances yourself.
Plan the clear room rectangle and circulation space
Room-fit calculation chart
Formulas used by the interactive tool. The head of the bed is assumed to sit against a wall.
Swipe horizontally inside the table to view every column.
| Check | Formula | What it measures | Tool result |
|---|---|---|---|
| Side clearance | (room width − mattress width) ÷ 2 | Equal aisle on left and right | Passes when at least the selected target remains |
| Foot clearance | room length − mattress length | Open space at the foot | Passes when at least the selected target remains |
| Rotated side clearance | (room width − mattress length) ÷ 2 | A 90-degree bed rotation | Tests an alternate orientation |
| Rotated foot clearance | room length − mattress width | Foot space after rotation | Tests an alternate orientation |
| Physical fit | Both remaining dimensions ≥ 0 | Whether the mattress rectangle fits at all | Shown separately from target-clearance fit |
| Height allowance | mattress length − sleeper height | Extra mattress length beyond body height | Compared with a 10 cm target |
| Width per sleeper | mattress width ÷ sleeper count | Nominal personal width | Displayed without a comfort claim |
| Area | mattress width × mattress length | Footprint for ranking | Used to sort larger fitting sizes |
Use one unit system consistently
- • The calculation uses mattress size only; bed frames can add several centimetres or inches.
- • Nightstands, wardrobes, radiators, door swings, and drawers are not automatically deducted.
- • The selected clearance is a planning preference, not a building-code rule.
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US room-fit examples with 24-inch clearance
Derived minimum room footprints when the head is against a wall and 24 inches remain on both sides and at the foot.
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| Mattress | Mattress size | Minimum clear floor rectangle | Approx. feet | Assumption |
|---|---|---|---|---|
| Twin | 38 × 75 in | 86 × 99 in | 7.2 × 8.2 ft | Mattress plus 24 in on each side and at foot |
| Twin XL | 38 × 80 in | 86 × 104 in | 7.2 × 8.7 ft | Mattress plus 24 in on each side and at foot |
| Full / Double | 53 × 75 in | 101 × 99 in | 8.4 × 8.2 ft | Mattress plus 24 in on each side and at foot |
| Queen | 60 × 80 in | 108 × 104 in | 9.0 × 8.7 ft | Mattress plus 24 in on each side and at foot |
| King | 76 × 80 in | 124 × 104 in | 10.3 × 8.7 ft | Mattress plus 24 in on each side and at foot |
| California King | 72 × 84 in | 120 × 108 in | 10.0 × 9.0 ft | Mattress plus 24 in on each side and at foot |
Width × length
- • These are arithmetic examples, not mandated room-size standards.
- • Add the outer frame overhang before making a purchase decision.
- • A room can be larger yet still fail because doors, closets, or furniture block the clear rectangle.
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Bedroom measurement checklist
A repeatable sequence for measuring the room before choosing a bed.
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| Step | Measure or mark | How | Decision supported |
|---|---|---|---|
| 1 | Clear room width | Wall to wall at mattress height | Maximum outer frame width |
| 2 | Clear room length | Head wall to opposite obstruction | Maximum outer frame length |
| 3 | Door swing | Trace the full arc | Whether the door remains usable |
| 4 | Wardrobe and drawer travel | Measure open depth | Required operating aisle |
| 5 | Window, radiator, and outlet locations | Mark fixed obstacles | Safe headboard and bedside placement |
| 6 | Nightstand footprint | Measure both stands | Real side clearance |
| 7 | Frame overhang | Compare outer frame to mattress | Correct room-fit calculation |
| 8 | Walkway target | Mark tape lines on floor | Whether circulation feels acceptable |
| 9 | Ceiling and sloped wall | Measure at headboard height | Headboard and bunk compatibility |
| 10 | Final taped rectangle | Outline the full outer frame | Visual check before ordering |
- • Measure the intended outer frame, not only the mattress.
- • Repeat measurements and record the unit beside every number.
- • Photograph the taped layout to compare options later.
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Match the mattress with the complete bed system
Mattress, frame, and bedding compatibility
What must match when assembling a complete bed.
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| Item | Match this dimension | Why it matters | What to verify |
|---|---|---|---|
| Mattress | Width × length | Defines the sleeping surface | Actual label and tape measurement |
| Frame opening | Internal support width × length | Too small prevents seating; too large leaves gaps | Inside dimensions, not outside silhouette |
| Outer frame | Overall width × length | Controls room fit and walkway space | Headboard, rails, footboard, upholstery |
| Slat system | Inside width and spacing | Supports the mattress according to maker rules | Centre rail, slat gap, weight limit |
| Foundation / base | Width × length and support type | Must suit mattress construction and warranty terms | Platform, box foundation, adjustable base |
| Fitted sheet | Pocket width × length × depth | A correct footprint can still fail on depth | Mattress depth plus topper |
| Protector | Footprint and depth range | Tight protectors can bow corners | Stated stretch range |
| Duvet / comforter | Desired drop, not just mattress label | Coverage changes with mattress height and sharing | Finished textile dimensions |
| Bed skirt | Drop from foundation top to floor | Wrong drop looks short or pools | Platform height and floor clearance |
| Adjustable base | Exact articulated-base size | Split and one-piece systems differ | Motor clearance and compatible mattress type |
- • Never assume a matching name guarantees a matching footprint.
- • Measure after adding a thick topper before buying deep-pocket sheets.
- • Follow the mattress and base manufacturers’ support instructions.
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Split beds and paired-mattress arrangements
Common ways two mattresses are used together.
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| Arrangement | Combined nominal footprint | Main benefit | Main caution |
|---|---|---|---|
| Two US Twin XL mattresses | About 76 × 80 in | Creates a split king footprint | Small brand tolerances can leave a ridge or gap |
| Split US king | 76 × 80 in overall | Independent adjustable-base movement | Requires split-compatible sheets or two fitted sheets |
| Two separate twins | About 76 × 75 in | Flexible guest-room layout | Shorter than a US king and not a standard king length |
| Zip-and-link pair | Seller-defined | Can switch between joined and separated layouts | Exact joined size depends on system |
| Dual AU long singles | Brand-defined | Long modular arrangement | Do not assume it equals a standard AU king |
| Split adjustable king | Regional king footprint | Independent head and foot settings | Centre seam remains |
| Two mattresses in one frame | Only if frame is designed for it | Modular transport and replacement | Improvised combinations can lack safe support |
- • Only the two-US-Twin-XL relationship is a common direct US size comparison in the cited guide.
- • For every modular system, verify the manufacturer’s combined dimensions.
- • A topper may soften the centre seam but can limit independent articulation.
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Choose for the sleeper, the room, and the delivery path
Bed size use-case guide
A practical starting point based on sleeper count, height, and available room.
Swipe horizontally inside the table to view every column.
| Situation | Start by comparing | Why | Check before buying |
|---|---|---|---|
| Young child after crib | Regional single / twin | Compact and widely supported | Guard rails, frame safety, room layout |
| Teen in a small room | Single, twin XL, or king single | Longer sizes delay height problems | Desk and wardrobe clearance |
| Tall solo sleeper | 80-inch, 200 cm, 203 cm, or longer size | Adds usable length | Body height plus desired allowance |
| Solo sleeper wanting width | Full, double, small double, or queen | More turning space | Room aisle and sheet availability |
| Couple in a compact room | Regional double or queen equivalent | Balances footprint and shared width | Width per sleeper and door swing |
| Couple wanting maximum width | Regional king or super king | Adds personal space | Delivery path and frame overhang |
| Tall couple | Long regional king or California king | Prioritizes length | California king is narrower than US king |
| College dorm | Twin XL where specified | Common long narrow dorm size in the US | Residence hall’s exact required size |
| Guest room for flexible use | Two singles or one double/queen | Supports one or two guests | Storage and conversion effort |
| Bunk or loft bed | Exact maker-approved single mattress | Top bunks often have thickness limits | Guard-rail height and mattress depth |
| Day bed / trundle | Exact product-specific mattress | Frames often use special dimensions | Thickness and pull-out clearance |
| Cross-border move | Keep exact metric dimensions | Names change by market | Replacement sheets and frame availability |
- • This table narrows the search but does not select firmness or mattress construction.
- • The largest size is not automatically best when it blocks circulation or storage.
- • For bunks, adjustable bases, and specialty frames, follow the product manual.
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Bed delivery-path checklist
Large mattresses and frames must pass every opening between the vehicle and bedroom.
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| Checkpoint | Measure | Common obstruction | Plan |
|---|---|---|---|
| Entry door | Clear width and height | Door closer, handle, threshold | Remove door only when safe and permitted |
| Hallway | Narrowest width | Console, radiator, corner | Measure turning space, not only straight width |
| Stair width | Clear width above handrail | Newel post, balustrade | Check the diagonal turning envelope |
| Stair landing | Width × depth × height | Low ceiling or tight return | Model the longest rigid component |
| Elevator | Door and cabin dimensions | Door dwell and weight limit | Reserve service elevator if required |
| Bedroom door | Clear opening | Trim and handle reduce width | Measure with door fully open |
| Bed frame parts | Longest package dimension | One-piece headboard | Confirm flat-pack or split-base packaging |
| Mattress format | Flat, rolled, folded, or split | Rigid spring unit | Ask for packaged dimensions |
| Removal path | Old mattress dimensions | No disposal route | Plan removal before delivery |
| Building rules | Access hours and protection | Booking or insurance requirement | Confirm with management |
- • The mattress may flex, but a headboard or foundation may be rigid.
- • Do not bend or fold a mattress unless the manufacturer allows it.
- • Measure packaged dimensions when the seller provides them.
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Bed size decision matrix
Questions that narrow the correct regional size before purchase.
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| Decision | Smaller answer points toward | Larger answer points toward | Final verification |
|---|---|---|---|
| How many regular sleepers? | Single / twin | Double, queen, king, or larger | Width per sleeper |
| How tall is the tallest sleeper? | 190 cm / 75 in may work | 200–213 cm / 80–84 in | Body height plus allowance |
| How wide is the clear room? | Narrow single or double | Queen, king, or super king | Outer frame plus side aisles |
| How long is the clear room? | Short regional sizes | Long XL, king, or California king | Outer frame plus foot aisle |
| Are there two nightstands? | Smaller mattress may preserve access | Larger room can support wider bed | Combined furniture footprint |
| Must drawers open beside the bed? | Leave a wider operating aisle | Larger bed only if storage still opens | Drawer travel distance |
| Will the bed move across borders? | Choose locally common dimensions | Custom sizes may need imported bedding | Local replacement availability |
| Will the base articulate independently? | One-piece mattress/base | Split system | Exact split dimensions |
| Is it a bunk, loft, or trundle? | Product-specific thin mattress | Standard adult bed options | Manual and thickness limit |
| Is delivery access tight? | Rolled mattress / modular frame | One-piece items only with verified access | Package dimensions and turn space |
| Is bedding already owned? | Match existing exact dimensions | Budget for new bedding | Sheet footprint and pocket depth |
| Is the room multi-purpose? | Preserve floor and desk space | Prioritize sleep surface | Tape both layouts on the floor |
- • Choose by constraints first, then compare comfort, construction, firmness, and price.
- • No chart can replace the exact product specification.
- • The interactive tool tests room geometry and height only.
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Use worked examples and exact conversion formulas
Worked bed-size examples
Examples showing how labels, dimensions, height, and room fit interact.
Swipe horizontally inside the table to view every column.
| Question | Given | Calculation or comparison | Result |
|---|---|---|---|
| Will a US queen fit a 10 × 12 ft room with 24 in target clearance? | Room 120 × 144 in; queen 60 × 80 in | Sides: (120−60)÷2 = 30 in; foot: 144−80 = 64 in | Yes, before adding frame overhang and furniture |
| Will a US king fit the same 10 × 12 ft room? | King 76 × 80 in | Sides: (120−76)÷2 = 22 in | It physically fits but misses a 24 in side target |
| Is California king wider than king? | 72 × 84 vs 76 × 80 in | 72 is 4 in less than 76 | No. It is 4 in narrower and 4 in longer |
| Are UK and US king equal? | UK 150 × 200 cm; US 76 × 80 in | US king ≈193 × 203 cm | No. The US king is about 43 cm wider |
| Is a 160 × 200 cm mattress a US queen? | 160 × 200 cm vs 152.4 × 203.2 cm | Different width and length | No. Buy by exact dimensions |
| Is a 190 cm mattress long enough for a 185 cm sleeper using 10 cm allowance? | 190−185 = 5 cm | 5 cm is below the 10 cm screen | Compare a 200 or 203 cm option |
| How much width does each couple get on a US queen? | 60 in ÷ 2 | 30 in each | Nominal width only; comfort is personal |
| Can two US Twin XL mattresses form a king footprint? | 2 × 38 in wide; 80 in long | 76 × 80 in combined | Approximately yes |
| Will UK king sheets fit US king? | 150 × 200 cm vs about 193 × 203 cm | Footprints differ greatly | No |
| What if the frame adds 4 in to each dimension? | Queen mattress 60 × 80 in | Outer frame 64 × 84 in | Use 64 × 84 in in the room-fit check |
- • Examples use nominal dimensions and simple arithmetic.
- • Actual product tolerances and frame designs can change the result.
- • The browser tool performs the same room and height checks for all listed regional sizes.
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Bed dimension conversion chart
Exact formulas and rounded reference values for switching between inches, feet, centimetres, and metres.
Swipe horizontally inside the table to view every column.
| Conversion | Formula | Example | Result |
|---|---|---|---|
| Inches to centimetres | in × 2.54 | 60 in × 2.54 | 152.4 cm |
| Centimetres to inches | cm ÷ 2.54 | 200 cm ÷ 2.54 | 78.74 in |
| Inches to feet | in ÷ 12 | 80 in ÷ 12 | 6.67 ft |
| Feet to inches | ft × 12 | 10 ft × 12 | 120 in |
| Centimetres to metres | cm ÷ 100 | 203 cm ÷ 100 | 2.03 m |
| Metres to centimetres | m × 100 | 3.2 m × 100 | 320 cm |
| Square inches to square feet | sq in ÷ 144 | 4,800 ÷ 144 | 33.33 sq ft |
| Square centimetres to square metres | sq cm ÷ 10,000 | 30,000 ÷ 10,000 | 3.00 sq m |
| Two equal side aisles | (room width−bed width)÷2 | (120−60)÷2 | 30 in each |
| Foot aisle | room length−bed length | 144−80 | 64 in |
- • Keep extra decimal places during calculation, then round only for display.
- • Do not convert a rounded inch label back into a precision metric manufacturing size.
- • The tool converts inputs internally to centimetres.
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Common bed-size mistakes
Errors that cause incompatible purchases or blocked rooms.
Swipe horizontally inside the table to view every column.
| Mistake | Why it fails | Better action |
|---|---|---|
| Buying by name alone | King, double, and single differ by region | Use width × length in one unit |
| Measuring only the mattress | Frames extend beyond the mattress | Use the frame’s outer dimensions for room fit |
| Ignoring mattress depth | Fitted sheets may pop off | Measure depth including topper |
| Assuming two singles equal a king | Lengths and widths may not match | Check combined dimensions |
| Forgetting door and drawer arcs | A bed can fit but make storage unusable | Tape the full layout and opening paths |
| Using rounded conversions as manufacturing dimensions | Rounding can create a poor fit | Use the maker’s native unit specification |
| Treating nominal size as exact | Handmade and upholstered products vary | Allow tolerance and confirm actual measurements |
| Ordering sheets from another country by label | Regional labels hide dimension differences | Compare finished sheet dimensions |
| Ignoring height needs | A 75-inch or 190 cm bed may be short | Compare body height plus allowance |
| Choosing the largest physical fit | No circulation space remains | Set a clearance target before shopping |
| Skipping delivery measurements | Large rigid parts cannot turn corners | Measure every door, hall, stair, and lift |
| Forgetting bunk mattress limits | A thick mattress can reduce guard-rail height | Follow the bunk manufacturer’s maximum thickness |
- • A room-fit result is incomplete until furniture and the outer frame are included.
- • Manufacturer dimensions override generic charts.
- • Keep purchase receipts and exact measurements together for returns or replacements.
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Limits of this chart and calculator
Bed labels and exact dimensions vary by country, brand, specialty market, and product line. Nominal charts cannot guarantee that a specific mattress, frame, foundation, or sheet will fit.
The calculator checks rectangular geometry. It does not assess mattress firmness, spinal support, sleep quality, medical needs, bunk safety, structural support, local code, or the practical turning envelope during delivery.
Confirm the product specification, warranty support rules, frame opening, outer frame size, mattress depth, delivery packaging, and return policy before purchase.
Frequently asked questions
What is the standard queen bed size in the United States?
A standard US queen mattress is approximately 60 inches wide by 80 inches long, or 152.4 by 203.2 centimetres.
What is the difference between a king and California king?
A US king is about 76 × 80 inches. A California king is about 72 × 84 inches, so it is 4 inches narrower and 4 inches longer.
Are UK and US bed sizes the same?
No. The names overlap, but the dimensions differ. A UK king is 150 × 200 cm, while a US king is about 193 × 203 cm.
What size bed is best for two adults?
Many couples start with a queen or the nearest regional equivalent. A king adds personal width, but the room and delivery path must support it.
How much longer should a mattress be than the sleeper?
A useful screen is about 10 cm longer than the sleeper. Personal posture, pillow position, and foot position can change the preferred allowance.
Do two Twin XL mattresses make a king?
Two standard US Twin XL mattresses placed side by side are approximately 76 × 80 inches, which matches the nominal footprint of a US king.
Is a full bed the same as a double bed?
In the United States, full and double usually refer to the same nominal 53 × 75 inch size. In other countries, double can mean a different footprint.
How do I know whether a bed fits my room?
Use the outer frame dimensions, subtract them from the clear room dimensions, and confirm the remaining side and foot aisles after accounting for furniture and door swings.
Should I measure the mattress or the frame?
Measure both. Mattress dimensions determine sleep and bedding compatibility, while the frame’s outer dimensions determine room fit.
Can I buy sheets by bed-size name when ordering internationally?
No. Compare the sheet’s stated width, length, and pocket depth with the actual mattress dimensions.
Why do mattress dimensions vary slightly?
Nominal sizes can have manufacturing tolerances, materials can compress, and upholstered edges can vary. Use the manufacturer’s product specification for final compatibility.
What does the bed size tool calculate?
It compares listed regional mattress footprints with room dimensions, a chosen clearance target, sleeper height, and sleeper count. It does not judge firmness or comfort.
Sources
Dimensions were checked against the following industry and manufacturer references. URLs are shown as plain text so the page does not create external source links.
Better Sleep Council — Mattress Sizes
Consumer guidance from an International Sleep Products Association-sponsored organization covering common US mattress dimensions and size comparisons.
https://bettersleep.org/mattress-sizes/
IKEA — Mattress size guides for UK and common metric markets
Two official regional guides list standard UK dimensions and common metric 80, 90, 140, 160, and 180 cm mattress widths, while emphasizing exact frame and room measurement.
https://www.ikea.com/gb/en/rooms/bedroom/mattress-size-guide-pub63d34391/ | https://www.ikea.com/sa/en/rooms/bedroom/mattress-size-guide-pub63d34391/
Sealy Australia — Bed and Mattress Size Guide in Australia
Provides Australian single through super king dimensions in millimetres, centimetres, and inches, with a stated manufacturing tolerance.
https://www.sealy.com.au/mattress-sizes/