A king label means different mattress dimensions in different markets: the cited UK example is 150 × 200 cm, US king is 193.04 × 203.2 cm, and Sealy Australia king is 183.5 × 203 cm. Compare the same item type first; covers and sheets require separate measurements.
Compare three king mattress footprints ↓
Open bedding size converterIn this guide
Three king names. Three mattress sizes.
These named mattress references use the same drawing scale. They do not describe covers or sheets.
First, identify what the size chart measures
If you are replacing a duvet cover, start with the filled insert. If you are buying a fitted sheet, start with the mattress and anything the sheet must cover. A mattress chart is useful for choosing a mattress; it cannot tell you the dimensions of a cover sold under the same name.
Write the item type beside every measurement. This small step prevents a common cross-border buying mistake: comparing a king mattress in one country with a king duvet in another. Dunelm and The Company Store publish separate bedding categories for a reason.
| Item | Compare | Additional check |
|---|---|---|
| Duvet cover | Cover and insert width and length | Maker’s intended pairing and ties |
| Fitted sheet | Mattress and sheet footprint | Total depth and intended fit range |
| Flat sheet | Product width and length | Desired drop or tuck |
Read the evidence: Dunelm bed linen buying guide · The Company Store T-Shirt Soft Jersey Knit Duvet Cover Set
Compare mattress sizes across the three markets
The mattress table keeps the UK, US and Australian references distinct. For king, the cited widths are 150 cm, 193.04 cm and 183.5 cm respectively. The US figure converts 76 inches using 2.54 cm per inch. Sealy states that its handmade Australian mattresses may vary by ±15 mm; the exact product specification and your own mattress still matter.
A familiar name can therefore describe a substantially different footprint. Use a table to narrow the search, then open the listing for the actual mattress or sheet you intend to buy.
| Market / size | Width × length (cm) | Width × length (in) | Reference |
|---|---|---|---|
| United Kingdom · Double | 135 × 190 | 53.15 × 74.8 | Dunelm bed linen buying guide |
| United Kingdom · King | 150 × 200 | 59.06 × 78.74 | Dunelm bed linen buying guide |
| United Kingdom · Super King | 180 × 200 | 70.87 × 78.74 | Dunelm bed linen buying guide |
| United States · Full | 134.62 × 190.5 | 53 × 75 | Casper mattress size guide Fitted sheet values are mattress footprint only; check pocket depth. |
| United States · Queen | 152.4 × 203.2 | 60 × 80 | Casper mattress size guide Fitted sheet values are mattress footprint only; check pocket depth. |
| United States · King | 193.04 × 203.2 | 76 × 80 | Casper mattress size guide Fitted sheet values are mattress footprint only; check pocket depth. |
| United States · California King | 182.88 × 213.36 | 72 × 84 | Casper mattress size guide Fitted sheet values are mattress footprint only; check pocket depth. |
| Australia · Double | 138.5 × 190 | 54.53 × 74.8 | Sealy Australian mattress size guide Sealy mattress dimensions; handmade products may differ by plus or minus 1.5 cm. These are not fitted-sheet sizes. |
| Australia · Queen | 152.5 × 203 | 60.04 × 79.92 | Sealy Australian mattress size guide Sealy mattress dimensions; handmade products may differ by plus or minus 1.5 cm. These are not fitted-sheet sizes. |
| Australia · King | 183.5 × 203 | 72.24 × 79.92 | Sealy Australian mattress size guide Sealy mattress dimensions; handmade products may differ by plus or minus 1.5 cm. These are not fitted-sheet sizes. |
| Australia · Super King | 203 × 203 | 79.92 × 79.92 | Sealy Australian mattress size guide Sealy mattress dimensions; handmade products may differ by plus or minus 1.5 cm. These are not fitted-sheet sizes. |
Measurements are rounded to two decimal places for display. Exact conversion uses 1 inch = 2.54 cm. Check the exact product, item type and intended fit before buying.
Read the evidence: Dunelm bed linen buying guide · Casper mattress size guide · Sealy Australian mattress size guide
Convert the dimensions, not just the size name
To convert inches to centimetres, multiply by 2.54. An illustrative 80 × 90 inch cover becomes 203.2 × 228.6 cm. Write both converted numbers next to the insert measurements before considering the name on the pack.
Keep width and length in the order supplied by the maker. WashSage compares the entered orientation; it does not rotate an item to manufacture a closer match. A nearest result identifies differences to inspect, rather than approving an interchangeable product.
- Record width × length and the units.
- Convert both dimensions before comparing.
- Read the exact range name and intended product pairing.
Use the right fitting question for each item
For a cover, compare its width and length with the insert and confirm the intended pairing. For a fitted sheet, also check total mattress depth. For a flat sheet, decide how much fabric you want at the sides and foot. These are different fitting jobs.
For example, 230 cm of flat fabric centred over a 150 cm mattress leaves 40 cm on each side before mattress depth or tucking uses any of it. That is geometry for planning, not a universal sheet allowance.
Read the evidence: The Company Store T-Shirt Soft Jersey Knit Sheet Set
Look up duvet covers in their own table
These are named cover references, separate from the mattress table. The Company Store’s jersey Full cover is 80 × 90 inches; its own cover chart also separates Twin from Twin XL. A shared market or brand does not remove the need to choose the correct product category.
Keep the insert measurements available when checking a proposed cover. Where two products differ, ask the seller whether that pairing is intended rather than applying a blanket rule about how many centimetres smaller a cover should be.
| Market / size | Width × length (cm) | Width × length (in) | Reference |
|---|---|---|---|
| United Kingdom · Double | 200 × 200 | 78.74 × 78.74 | Dunelm bed linen buying guide Typical UK cover dimensions. Check the actual filled item. |
| United Kingdom · King | 230 × 220 | 90.55 × 86.61 | Dunelm bed linen buying guide Typical UK cover dimensions. Check the actual filled item. |
| United Kingdom · Super King | 260 × 220 | 102.36 × 86.61 | Dunelm bed linen buying guide Typical UK cover dimensions. Check the actual filled item. |
| Australia · Double | 180 × 210 | 70.87 × 82.68 | Sheridan size guide Sheridan king cover is 245 cm wide; its king quilt is 240 cm. |
| Australia · Queen | 210 × 210 | 82.68 × 82.68 | Sheridan size guide Sheridan king cover is 245 cm wide; its king quilt is 240 cm. |
| Australia · King | 245 × 210 | 96.46 × 82.68 | Sheridan size guide Sheridan king cover is 245 cm wide; its king quilt is 240 cm. |
| Australia · Super King | 270 × 240 | 106.3 × 94.49 | Sheridan size guide Sheridan king cover is 245 cm wide; its king quilt is 240 cm. |
| United States · Full | 203.2 × 228.6 | 80 × 90 | The Company Store T-Shirt Soft Jersey Knit Duvet Cover Set Verified jersey duvet-cover product. Queen uses the Full/Queen cover; King and California King share a cover. |
| United States · Queen | 228.6 × 243.84 | 90 × 96 | The Company Store T-Shirt Soft Jersey Knit Duvet Cover Set Verified jersey duvet-cover product. Queen uses the Full/Queen cover; King and California King share a cover. |
| United States · King | 274.32 × 243.84 | 108 × 96 | The Company Store T-Shirt Soft Jersey Knit Duvet Cover Set Verified jersey duvet-cover product. Queen uses the Full/Queen cover; King and California King share a cover. |
| United States · California King | 274.32 × 243.84 | 108 × 96 | The Company Store T-Shirt Soft Jersey Knit Duvet Cover Set Verified jersey duvet-cover product. Queen uses the Full/Queen cover; King and California King share a cover. |
Measurements are rounded to two decimal places for display. Exact conversion uses 1 inch = 2.54 cm. Check the exact product, item type and intended fit before buying.
Read the evidence: The Company Store T-Shirt Soft Jersey Knit Duvet Cover Set · Sheridan size guide
A short purchase note prevents a second search
Save a note containing the country, brand, range, item type, width, length and any depth requirement. Add the dimensions of what you already own. That makes a retailer’s answer specific enough to use. The bedding size converter is useful when the tables use different units; enter both actual dimensions when a named reference does not describe your product.
A UK-to-US king purchase check
The cited US king mattress is 43.04 cm wider and 3.2 cm longer than the UK king reference. A fitted sheet needs the actual footprint and depth, regardless of a shared king name. Use the separate insert and cover dimensions when shopping for a duvet cover.
Read the evidence: Dunelm bed linen buying guide · Casper mattress size guide · Sealy Australian mattress size guide
Questions about fit and measurements
Is a UK king the same size as a US king?
No. The cited UK king mattress is 150 × 200 cm; the US king is 76 × 80 inches, or 193.04 × 203.2 cm. Those are mattress measurements. Check a separate chart for a duvet cover, comforter or sheet.
Is an Australian king the same as a US California king?
Do not substitute one name for the other. Compare the exact mattress width and length from each listing. Sealy’s Australian king reference is 183.5 × 203 cm; the bedding you buy also needs its own category and product measurements.
Can the closest converter result tell me which cover to buy?
It can show a dimensional comparison, but it cannot approve the pairing. Review both differences, check your insert and ask the maker about intended fit where necessary. For fitted sheets, check depth as well as width and length.
Sources and scope
- Dunelm bed linen buying guide
- The Company Store T-Shirt Soft Jersey Knit Duvet Cover Set
- Casper mattress size guide
- Sealy Australian mattress size guide
- The Company Store T-Shirt Soft Jersey Knit Sheet Set
- Sheridan size guide
Dimensions describe the named market and product range, not universal fit. Compare your exact item measurements and the manufacturer’s intended fit range before buying. Report a correction with the page and supporting source.