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A king bedsheet generally fits a 180 cm × 200 cm mattress, while a super king fits 200 cm × 200 cm. The difference is width, not length, so measure your mattress and add at least 15–20 cm of tuck-in allowance on each side before choosing, especially for deep mattresses.
Size names sound simple, but labels can vary by brand and by market. A sheet sold as king in one shop may not match a sheet sold as king in another, so always check the size in centimetres on the label, not only the name on the packet. This guide explains the usual sizes, how to measure, and how fitted and flat sheets differ, so you can buy once and sleep well.
A king bedsheet is made for a mattress of about 180 cm wide and 200 cm long. A fitted king sheet will be larger than the mattress itself, because the pocket and elastic must wrap around the sides and tuck underneath. A flat king sheet is usually larger still, so there is enough fabric to fold over the top and tuck in at the sides and foot.
King is a common choice for couples who want more room than a queen or double, without moving to the widest bed size. Two people can sleep with less disturbance, and there is more space for pillows and for turning over. If your bed frame is close to a wall, remember that a king bed still needs room to make the bed and to walk around it.
A super king bedsheet is made for a mattress of about 200 cm wide and 200 cm long. That is 20 cm wider than a king, with the same length. Super king beds are often chosen for large bedrooms, for families who share a bed, or for people who simply want the most sleeping space.
Before choosing super king, check your room. A 200 cm wide bed, plus a frame, leaves less space for bedside tables and for walking around the bed. Measure the room as well as the mattress, and check doorways and stairways if you are buying a new mattress and base at the same time.
The main difference is width. A king mattress is about 180 cm wide, while a super king is about 200 cm wide, so the super king is 20 cm wider. Length is usually the same at 200 cm, so a super king does not give you extra leg room, only extra width.
In area, a king mattress covers about 3.6 square metres, while a super king covers about 4.0 square metres, a difference of about 0.4 square metres. That extra width can make a real difference for two sleepers, but it also means larger sheets, larger duvets, and more laundry. If you already own king bedding, it will not fit a super king mattress well, because the sheet will be too narrow to tuck in properly.
Measure width across the widest part of the mattress, then length from head to foot, then depth from the top surface to the bottom. Include any mattress topper in the depth, because a fitted sheet must cover the topper as well as the mattress. Write the three numbers down in centimetres before you shop.
For a fitted sheet, choose a pocket depth that is equal to or greater than your mattress depth. For a flat sheet, add at least 15–20 cm of tuck-in allowance on each side to the mattress width, and enough length to fold over at the top and tuck in at the foot. If you are between sizes, the larger size is usually safer, because a sheet that is too small will pull off at night.
A fitted sheet has elastic corners and a pocket that wraps around the mattress. It stays in place well and is easy to put on, but the pocket depth must match the mattress. A flat sheet has no elastic, so it can be tucked in to suit different depths, but it may come loose if it is too small or if you move a lot in sleep.
Deep mattresses, often above 30 cm, need a deep-pocket fitted sheet. Standard pockets may be about 25–30 cm, while deep pockets can be 35–40 cm or more, so check the pocket depth on the product page. Wash sheets at 30–40°C unless the care label says otherwise, and avoid overloading the machine so sheets can move freely and rinse well.
Use this table as a starting point, then check the exact size in centimetres on the product you plan to buy, because brands can vary.
| Size | Mattress size (cm) | Area |
|---|---|---|
| Single | 90 × 190 | 1.7 sq m |
| Double | 135 × 190 | 2.6 sq m |
| Queen | 160 × 200 | 3.2 sq m |
| King | 180 × 200 | 3.6 sq m |
| Super king | 200 × 200 | 4.0 sq m |
Thread count is another detail to check, but it is not a measure of size. A 210 TC sateen sheet, for example, is a mid-weight weave with a smooth feel, and it is a useful example when comparing sheets of the same size. Focus first on size and pocket depth, then on material, weave, and care instructions, so the sheet fits and feels right.
Choose king if your mattress is 180 cm wide and you want a generous bed without the largest footprint. Choose super king if your mattress is 200 cm wide, your room has space for it, and you want the extra 20 cm of width for two sleepers. In both cases, measure first, check the pocket depth for fitted sheets, and allow for tuck-in on flat sheets.
To browse options, see the bedsheet collection, including the Delecacy Selene – 210 TC Sateen Stripe Bedsheet | Muted Violet and the Delecacy Nivara – 210 TC Sateen Stripe Bedsheet | Off White. Check the size, pocket depth, and care label before ordering, so the sheet you choose fits your mattress on the first try.
In short, king is 180 × 200 cm and super king is 200 × 200 cm. The difference is width, not length, so measure your mattress, allow for tuck-in, and match the sheet size to the centimetres, not only to the name.
A king bedsheet fits a mattress of about 180 cm by 200 cm. A fitted sheet will be larger, so the pocket can wrap around the sides and depth of the mattress.
A super king bedsheet fits a mattress of about 200 cm by 200 cm. It is 20 cm wider than a king, with the same length.
Measure width, length, and depth in centimetres, including any topper. Choose a fitted sheet with a pocket depth that covers the full depth, and allow 15-20 cm of tuck-in on each side for a flat sheet.
Choose a deep-pocket fitted sheet if your mattress is above 30 cm deep, and check the pocket depth on the product page. Wash sheets at 30-40 degrees Celsius unless the care label says otherwise.