King Size Bed Sheets

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.

A flat sheet is a lightweight rectangular layer that sits between you and your duvet. It adds comfort, helps regulate temperature, and keeps your duvet cover cleaner for longer, meaning you wash it less often. Many customers also use a flat sheet on its own during warmer months as a breathable alternative to a full duvet. It is a simple upgrade that makes a noticeable difference to your sleep routine.

A fitted sheet has elasticated corners that wrap securely around your mattress to create a smooth, stable base. A flat sheet lies loosely over the top and can be tucked in for a crisp, hotel-style finish. They work best together - the fitted sheet protects your mattress, the flat sheet adds comfort and reduces how often your duvet cover needs washing. Belledorm offers both in matching collections across the full range.

Choose the size that matches your mattress - Single, Double, King or Super King. Belledorm flat sheets are generously cut to allow for easy tucking on all sides. If you prefer a more dramatic drape or a hotel-style layered look with extra overhang, sizing up is a good option.

Go for a percale weave in 100% cotton or Egyptian cotton - both are naturally breathable and get crisper with every wash. The 200TC or 400TC Egyptian cotton options are particularly popular with warm sleepers. Bamboo is also worth considering, it is naturally temperature regulating and exceptionally soft. Avoid sateen weaves if you tend to overheat, as the denser finish retains more warmth.

Percale has a crisp, cool, matte finish - ideal if you prefer that fresh, hotel-style feel or tend to sleep warm. Sateen has a smooth, silky surface with a subtle sheen that feels more luxurious to the touch but retains slightly more warmth. If you are unsure which to choose, percale is the more versatile everyday option. Sateen suits those who prioritise a softer, more indulgent feel.

Both are premium long-staple cottons known for exceptional softness and durability, but they come from different origins. Egyptian cotton is grown in the Nile Delta and is widely regarded as the gold standard for bedding. Pima cotton, grown primarily in the Americas, has similarly long fibres and offers a beautifully smooth feel with a natural sheen. Belledorm's 450TC Pima Cotton flat sheet is a great option if you want luxury quality at a slightly lower price point than the top-tier Egyptian cotton ranges.

Not necessarily. Thread count is one factor, but fibre quality and weave construction matter just as much. A well-made 200TC Egyptian cotton flat sheet will often feel better and last longer than a cheap 800TC sheet made from inferior cotton. Belledorm's range runs from 200TC up to 1200TC, the right choice depends on your preference for feel and budget, not just the number on the label.

Absolutely - this is one of the most practical uses of a flat sheet. During warmer months, a lightweight cotton or bamboo flat sheet on its own provides just enough coverage without the heat of a duvet. The 200TC percale and bamboo options are particularly popular for summer use thanks to their breathability and cool, crisp feel against the skin.

Spread the sheet evenly over your fitted sheet with equal overhang on each side. Tuck the foot end firmly under the mattress first, then fold each bottom corner into a neat hospital corner, pulling the side overhang taut and tucking it under in a diagonal fold. Belledorm's cotton and Egyptian cotton weaves are particularly well-suited to this thanks to their natural structure and drape.

Yes - most Belledorm flat sheets have a sample option available so you can feel the fabric quality before buying. Look for the "Sample Available" label on individual product listings throughout the range. It is a particularly useful option if you are choosing between thread counts or fabric types for the first time.