A fitted sheet that rides up from the corners during the night can spoil even a carefully prepared bedroom. Yet the right fitted sheet size is not a matter of guesswork. All you need is to know three dimensions of your mattress and give it a material that holds its shape, feels pleasant to the touch and lets you sleep without constant adjusting.
A well-chosen sheet is almost invisible on the bed - and that is exactly where its charm lies. It wraps the mattress smoothly, does not create excess folds and stays in place even if you toss and turn at night. In the morning, all you have to do is straighten the duvet and the bedroom looks calm, clean and tidy.
How to find the right fitted sheet size
What matters most is the size of the mattress, not the bed frame or the duvet. Measure its width, length and depth. The first two determine the basic size of the sheet, while the depth tells you whether the elastic will comfortably reach under the bottom edge of the mattress.
Measure the mattress without a protector, topper or bedding. If you use them permanently, however, factor in their height when choosing. A 20 cm mattress can easily gain another 5 to 8 cm once you add a thick protector and a topper. A sheet that used to fit may then suddenly be too shallow.
For a fitted sheet, you usually choose the same size as the mattress. A 90 × 200 cm mattress needs a 90 × 200 cm sheet, and a 180 × 200 cm double mattress a 180 × 200 cm sheet. Stretchy jersey adapts within a few centimetres, but it is not a good idea to rely on its stretch as a substitute for the correct size.
A sheet that is too small will have to be pulled on by force. The elastic can slip out, the corners will keep popping up and the fabric will be uncomfortably taut across the mattress. A sheet that is too large, on the other hand, creates folds that shift under your back during sleep or trap air beneath the sheet. Either way, the bed loses both its neat look and its comfort.
Width and length: stick to the mattress size
A standard single mattress is usually 80, 90 or 100 cm wide and 200 cm long. For wider beds you will often come across sizes of 120 × 200, 140 × 200, 160 × 200 and 180 × 200 cm. There are also extra-long mattresses measuring 210 or 220 cm. This is where it pays to measure carefully - a 200 cm sheet may stretch over a longer mattress, but it will not have enough allowance for deep corners.
If you have two separate mattresses in a double bed, the way you sleep decides. Two sheets sized for the individual mattresses make handling easier, especially when each partner has a different mattress firmness or depth. One large sheet across both mattresses, on the other hand, creates a visually calmer surface. The gap between the mattresses may be noticeable, though, and the fabric may shift slightly as you move.
Mattress depth decides whether the sheet stays in place
The size stated on the sheet's packaging describes the surface of the mattress. Just as important, however, is the depth of its corners, sometimes called the pocket depth. This determines how far down the side of the mattress the fabric wraps.
Low mattresses of around 15 to 20 cm pose no problem for most classic fitted sheets. For mattresses 25 cm deep or more, check that the sheet has deep enough corners. The same applies to box-spring beds, where the mattress tends to be deeper and is often topped with a topper.
Ideally, the elastic should sit a few centimetres below the edge of the mattress. The sheet then stays put even when you move, and you do not have to hunt for the corners again when making the bed in the morning. There is no need to choose an unnecessarily large size just because the mattress is deep. Look for a sheet designed for a deeper mattress, not a wider or longer one.
When to choose a different fitted sheet size
Mattress sizes are not always perfectly standard. Older beds, custom-made beds or children's mattresses may have different measurements. A difference of one or two centimetres is usually handled by the stretchy material. But if the mattress is narrower, longer or wider by several centimetres, choose a sheet as close to its actual size as possible.
Also pay attention to rounded corners, very thick edging or a mattress with an irregular shape. A fitted sheet works best on a classic rectangular mattress. For non-standard beds, it may be more practical to have one made to measure or to use a flat sheet that can be tucked under the mattress.
A cot is a separate chapter. Its mattresses tend to be firmer and lower, and their sizes vary between manufacturers. The sheet should fit really snugly, with no loose fabric on the sleeping surface. This is not just about looks, but also about safe and peaceful sleep.
Material helps, but it cannot make up for the wrong size
A quality woven sheet reveals itself by how it fits and how it behaves night after night and wash after wash. Organic cotton in a smooth sateen weave, as in the Organic Cloud sheet, is soft, gentle on the skin and pleasant all year round. Combed, mercerised fibres give the surface a fine, refined look and create a clean, hotel-calm atmosphere in the bedroom.
If you warm up easily at night, reach for a sheet made of TENCEL™ lyocell. This natural fibre from eucalyptus wicks moisture excellently and feels cool to the touch. You will appreciate airy, breathable materials wherever regular cotton starts to feel too warm.
How well a sheet stays on the mattress, however, comes down to its construction. Elastic in the corners, exactly where it makes sense, ensures the sheet is easy to put on, stretches beautifully taut and stays in place all night. A good sheet holds the corner without squeezing, keeps its colour and does not bunch up on the mattress even after repeated washing.
When choosing, think about the season and your own thermal comfort: breathable and cooling materials for hot nights, cotton sateen for a fine, soft feel all year round. The right size of Lejaan sheets, made for mattresses 18 to 30 cm deep, then ensures you really feel the qualities of the material, without layers and folds that would block airflow.
How to put on a fitted sheet properly
Start with the two corners on one short side of the mattress, then pull over the opposite corners. Finally, smooth the fabric with your palm from the centre towards the edges. This simple method prevents the sheet from twisting on the surface or one side staying unnecessarily taut.
If you have a deeper mattress, lift it only as much as necessary when putting the sheet on. Forcing the elastic over the edge can shorten its lifespan. Once it is on, check that the hem wraps the entire underside of the mattress and has not stopped halfway down the side.
Wash the sheet according to the manufacturer's recommendations, ideally separately from rough materials with zips or hooks. High temperatures and overly intensive drying can gradually weaken the elastic fibres and the elastic itself. If you care for it gently, it will keep its smooth look and pleasant feel for longer.
A small detail for a better morning, every morning
A bed does not have to be perfectly styled to feel good. It is enough for it to have a foundation that works: a quality mattress, clean bedding and a sheet that stays exactly where it should. Measure your mattress today and choose a size without compromise. In the evening, you will then lie down on a smooth, calm surface that lets what matters most shine through - your rest.
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