Choose a duvet cover by comparing its published width and length with your filled insert, then checking the maker’s intended pairing. Measure the insert rather than relying on the mattress or a king label. There is no universal extra-width or shrinkage allowance that confirms every brand’s fit.
Measure the insert and cover separately ↓
Open bedding size converterIn this guide
Measure the insert and cover separately
Illustrative insert
225 × 220 cm
Illustrative cover
220 × 220 cm
Same length; 5 cm different width. Lay each item flat and measure seam to seam without stretching. Record width and length in the same unit, then ask the maker whether that exact pairing is intended.
Take two measurements before opening the shop
Lay the dry insert flat in its natural shape without pulling it tight. Measure edge to edge across the width and along the length, then compare the readings with its label or original product listing. If the figures differ noticeably, measure again and ask the maker which specification to use.
Make a note such as “insert: 220 cm wide × 230 cm long”. This is more useful to a seller than “a king duvet”, particularly when you are changing brands or shopping in another country. Keep the mattress dimensions in a separate note; they answer the question of bed coverage.
Read a cover listing as a product specification
Look for an actual cover chart rather than a generic bed-size menu. The Company Store’s jersey range lists the Full duvet cover at 80 × 90 inches and the Full/Queen at 90 × 96 inches. The exact range and selected variant matter.
If a listing offers only “double”, “queen” or “king”, ask for finished width and length before ordering. A colour selector or size menu may be shared across related items; check that the dimensions belong to the cover you are purchasing.
Read the evidence: The Company Store T-Shirt Soft Jersey Knit Duvet Cover Set
Duvet-cover reference dimensions
Use these named UK, US and Australian examples to compare the cover category. They are shopping references rather than a universal sizing standard. Open the source listing when you need confirmation about a particular range.
The converter can put inches and centimetres on the same basis. It cannot infer the intended fullness or determine how a particular fabric will sit around your insert.
| 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: Dunelm bed linen buying guide · The Company Store T-Shirt Soft Jersey Knit Duvet Cover Set · Sheridan size guide
A matched length can hide a width problem
Suppose your insert measures 220 × 230 cm and a proposed cover is 200 × 230 cm. The length matches; the width is 20 cm smaller. Recording the measurements makes that question visible immediately. It does not establish that a 20 cm difference is acceptable or unacceptable for every construction: ask about the intended pairing.
Avoid correcting the difference with an assumed laundering allowance. A general shrinkage percentage or a rule to buy every cover smaller than the insert cannot establish the finished fit of the exact products in front of you.
Check what holds the insert in place
Dimensions are the first check. Fastening details are the next. The Company Store describes interior corner ties that connect to loops on its basic bedding comforters. Use that as a reason to inspect your own pair, rather than assuming every insert has matching loops.
Before ordering, check the closure and care information too. A washable cover does not give its filled insert the same washing or drying permission.
- Compare tie positions with the insert’s loops.
- Check the button, zip or other closure.
- Read the cover and insert care labels separately.
- Save the range, selected size and published dimensions.
Read the evidence: The Company Store T-Shirt Soft Jersey Knit Duvet Cover Set · Bosch European laundry care symbols
Use a two-number shopping note
A 225 × 220 cm insert and a 220 × 220 cm cover differ by 5 cm in width even though their lengths match. Send both dimensions to the seller and ask whether that exact pairing is intended. Keep the answer with the selected range and size.
Read the evidence: The Company Store T-Shirt Soft Jersey Knit Duvet Cover Set · Belledorm bedding size guide
Keep a measurement you can check next time
Record the exact product, date, measuring method and actual reading. Keep a label photograph and the relevant manual page with it. A measured dry weight or dimension is useful evidence for your own item; a wash or fit result needs its own observation.
Open the printable product and measurement record . The form starts blank and does not send or publish your entries.
The examples on this page are calculations or drawings from stated inputs. WashSage has not presented them as hands-on product tests or original product photography.
What if a cover is sold as Full/Queen or King/California King?
Treat the combined label as that range’s shopping category. Read its actual cover dimensions and compare them with your insert. A combined label does not mean every mattress, comforter or cover in those categories has identical measurements.
Sources and scope
- The Company Store T-Shirt Soft Jersey Knit Duvet Cover Set
- Dunelm bed linen buying guide
- Sheridan size guide
- Bosch European laundry care symbols
- Belledorm bedding 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.