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King Size Bed Sheets
From easy-care 200 TC to luxury 1500 TC and Mulberry Silk, from Single to Super King—discover a wide choice of high-quality flat sheets crafted with comfort and practicality in mind. Plain or Embroidered, select your preferred design and colour and outfit your bed in style.
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Finding the right bed sheet
The type of sheet you need depends on your bed, your mattress depth, and how you prefer your bedding to feel. Fitted sheets sit over the mattress and are held in place by elasticated corners - Belledorm fitted sheets are available in three depths: standard 30cm for mattresses up to 22cm, extra deep 38cm for mattresses up to 30cm including those with a topper, and ultra deep 46cm for the deepest mattresses and adjustable beds. Flat sheets sit between you and the duvet and are the traditional choice for a layered, hotel-style bed.
Fabric makes the biggest difference to how a sheet feels. 200 thread count polycotton is lightweight, crease-resistant, and quick to dry - ideal for everyday use and children's beds. Egyptian cotton uses longer-staple fibres that produce a smoother, more consistent surface, and is available from 200 to 1200 thread count. For cooler sleep, bamboo has natural moisture-wicking properties. In winter, brushed cotton flannelette traps warmth with its soft, napped finish.
All Belledorm sheet fabrics are available in matching duvet covers and pillowcases, so you can coordinate your whole bed in one thread count and colourway.
Got King Size Bed Sheet Questions? We've Got Answers
A fitted sheet wraps around the mattress and is held in place by elasticated corners. It stays put overnight and is the standard base layer for most beds. A flat sheet is a single, unhemmed piece of fabric that sits between you and the duvet. It adds a layer of temperature regulation, protects the duvet cover from body oils and perspiration, and gives the bed a traditional, hotel-style finish. Many people use both together; some prefer just a fitted sheet and duvet.
The most common reason a fitted sheet pulls free is that the depth is wrong for the mattress. Measure the total depth of your mattress including any topper and choose a sheet with a box depth that matches - a 30cm sheet on a 28cm mattress will have very little fabric to tuck under and will slip off. Belledorm fitted sheets have fully elasticated edges (not just corner elastic), which keeps the sheet anchored more securely around all four sides of the mattress.
UK king size bed bedding from Belledorm follows the standard dimensions used across the British bedding industry, with fitted sheet depth varying depending on your mattress.
| Product | Standard UK Size |
|---|---|
| Fitted sheet | 150cm x 200cm (5ft x 6ft 6in) |
| Flat sheet | 275cm x 275cm |
| Duvet cover | 225cm x 220cm |
Fitted sheets are available in three depths: standard 30cm (12 inches) for mattresses up to 22cm deep, extra deep 38cm (15 inches) for mattresses up to 30cm including those with toppers, and ultra deep 46cm (18 inches) for the deepest adjustable and pocket sprung mattresses. Always measure your total mattress depth, including any topper or protector, before selecting a fitted sheet depth. Note that UK king size dimensions differ from US king size - always verify before purchasing internationally.
A standard Belledorm king size fitted sheet (150cm x 200cm) fits a UK king size mattress measuring 150cm wide by 200cm long, the most popular larger bed size in the UK, found in master bedrooms and higher-end hotel rooms.
The fitted sheet's length and width dimensions are fixed to the mattress size. What varies is the depth, the box measurement that wraps under the mattress edge. Belledorm offers king size fitted sheets in 30cm (standard), 38cm (extra deep), and 46cm (ultra deep) depths to accommodate mattresses from standard models through to deep pocket sprung mattresses with toppers. Note that UK king size (150cm x 200cm) is a different dimension to US king size (193cm x 203cm) - a UK king size sheet will not fit a US king size mattress. If your mattress measures 180cm wide, you need the super king range, not king size.
A UK king size bed measures 150cm x 200cm (5ft x 6ft 6in). A super king measures 180cm x 200cm (6ft x 6ft 6in) - 30cm wider at the same length. The two sizes use different fitted sheets, flat sheets, and duvet covers, none of which are interchangeable.
The additional 30cm width of a super king provides each person sharing the bed with an extra 15cm of sleeping space - a meaningful difference in comfort for couples. Both sizes share the same 200cm length, making them equally suitable for taller adults. A king size fitted sheet will not stretch to fit a super king mattress and will pull free from the corners. If you are unsure which size your mattress is, measure the width: 150cm is king size, 180cm is super king.
For most couples, a king size bed (150cm x 200cm) is a significant comfort improvement over a double (135cm x 190cm), providing 15cm more width and 10cm more length.
The additional width gives each person sharing the bed approximately 7.5cm more sleeping space, which makes a noticeable difference to comfort - particularly for couples who move during the night or prefer not to sleep in close contact. The 10cm extra length is also beneficial for adults over 6ft who find a 190cm double mattress restrictive. The practical trade-off is floor space: a king size bed requires approximately 20cm more room width than a double, which matters in smaller bedrooms. Belledorm's king size range covers 118 products from Basics Polycotton from £12.50 through to 1200TC Cotton Sateen, the same full fabric range as the double size.
To fully dress a king size bed, you need a fitted sheet, a duvet cover, and at least two pillowcases. A flat sheet is optional but recommended for a layered or hotel-style finish.
The complete king size bed bedding list:
- Fitted sheet (150cm x 200cm) - in your chosen depth: 30cm, 38cm, or 46cm
- Duvet cover (225cm x 220cm) - sized for a king size duvet
- Pillowcases - standard UK pillow is 48cm x 74cm; two for a king size bed
- Flat sheet (275cm x 275cm) - optional, used between the fitted sheet and duvet
- Mattress protector (150cm x 200cm) - recommended to extend mattress life and add a hygiene layer
- Valance sheet - optional, used to conceal the bed base and divan legs for a neater finish
All items are available in matching fabrics and colours across Belledorm's king size range, making it straightforward to build a fully coordinated set.
Yes, UK king size bed sheet dimensions are standardised: fitted sheets are 150cm x 200cm, flat sheets are 275cm x 275cm, and duvet covers are 225cm x 220cm. Belledorm's king size range follows these standard UK dimensions throughout.
The critical caveat is that UK king size is not the same as US king size. US king size mattresses measure 193cm x 203cm, significantly larger than the UK standard. Always confirm you are purchasing UK-sized bedding. The fitted sheet depth is also not standardised and varies by product and brand - always check the box depth (30cm, 38cm, or 46cm) against your mattress measurement. If your mattress measures 180cm wide rather than 150cm, you need super king bedding, not king size.
Yes, UK double bed sheet dimensions are standardised: fitted sheets are 135cm x 190cm, flat sheets are 230cm x 275cm, and duvet covers are 200cm x 200cm. Belledorm's double range follows these standard UK dimensions throughout.
The one variable is fitted sheet depth, this is not standardised and varies by product and brand. Always check the box depth (30cm, 38cm, or 46cm) against your mattress measurement before purchasing. One common point of confusion is the duvet cover: a double duvet cover (200cm x 200cm) is square, not rectangular, this is correct and standard across the UK industry. If you are buying bedding as a gift or for a property you cannot measure, standard UK double dimensions apply to the overwhelming majority of double beds manufactured since 2000.