Bed Sheet Sizes UK: Fitted and Flat Sheet Sizes in cm

Sheets cause more sizing mistakes than duvets, because a sheet has two sizes to get right. A fitted sheet needs the right width and length, which is easy, and the right depth, which is where most of the problems start. A flat sheet needs enough spare fabric on every side to tuck under the mattress. This guide gives both sets of measurements in centimetres and inches and explains how to check your own bed.

Measurements checked against the fitted and flat sheets we sell on 6 November 2026.

Fitted sheet sizes UK

Fitted sheet	Centimetres	Inches (approx.)	Bed name
Single	90 × 190 cm	35 × 75 in	3 ft
Small Double	120 × 190 cm	47 × 75 in	4 ft, also called three-quarter
Double	135 × 190 cm	53 × 75 in	4 ft 6 in
King	150 × 200 cm	59 × 79 in	5 ft
Super King	180 × 200 cm	71 × 79 in	6 ft

A fitted sheet is labelled by the mattress it fits, so the numbers are the mattress's width and length. What changes from one sheet to another is the depth of the elasticated skirt. Our fitted sheets are cut for mattresses up to 35 cm deep, about 14 inches, in every size and all four fabrics. From 15 inches we tailor a deeper skirt, which you can choose when you build your set.

We stock the Single, Double, King and Super King. A small double fitted sheet is cut to order: ask through our custom sizes form, or read the small double bedding page for the options.

To shop by bed, go to single, double, king size or super king bedding.

Fitted sheet depth: the measurement that matters

Measure the mattress from the base to the top surface, standing the tape measure upright against its side. If you keep a topper on the bed all the time, measure to the top of the topper. Then buy a sheet whose depth is equal to or more than that number. A sheet cut deeper than you need simply tucks further under; a sheet cut shallower than your mattress will pull off a corner during the night.

Labels such as "deep" and "extra deep" are not a UK standard and differ between brands, so always compare the centimetre figure on the pack. We explain the labels and how to measure in more detail in deep and extra deep fitted sheets.

Flat sheet sizes UK

Flat sheet	Centimetres	Inches (approx.)	For a mattress of
Single	180 × 260 cm	71 × 102 in	90 × 190 cm
Double	230 × 260 cm	90 × 102 in	135 × 190 cm
King	275 × 275 cm	108 × 108 in	150 × 200 cm
Super King	305 × 275 cm	120 × 108 in	180 × 200 cm

These are the sizes of our Plain Cotton flat sheets, which are 200 thread count percale with a deep top hem. Other brands vary by 10 to 20 cm either way, so check before you buy a flat sheet to match an existing set.

Why a flat sheet is so much bigger than the bed

A flat sheet has no elastic, so it stays put by being tucked under the mattress. It has to cover the top, go down both sides and then fold underneath. Take a double: the sheet is 230 cm wide and the mattress is 135 cm, which leaves about 47 cm on each side. Around 30 cm of that goes down the side of a typical mattress and the rest tucks under. The length works the same way, with extra at the head so the top hem can fold back over the duvet.

If your mattress is very deep, the tuck shrinks. On a 35 cm mattress a double flat sheet still has about 12 cm to tuck in at each side, which holds. Go much deeper than that and it is worth choosing the next flat sheet size up.

Fitted sheet or flat sheet?

Most UK beds are made with a fitted sheet on the mattress and a duvet on top, with no flat sheet at all. A flat sheet is worth adding if you like a layer between you and the duvet that can be washed more often, or if you sleep under blankets rather than a duvet. Some people also use a flat sheet instead of a fitted one, tucking it tightly with hospital corners. If you want both, buy them in the same size as your bed: a double fitted sheet and a double flat sheet.

Continental and other sizes

European beds are usually 200 cm long, and common widths are 90, 140, 160 and 180 cm. Only the 180 × 200 cm bed matches a UK size, the Super King. A 140 × 200 cm mattress is 5 cm wider and 10 cm longer than a UK double, so a UK double fitted sheet will be very tight. US Queen and King mattresses also differ from UK sizes. For any of these we cut sheets to measure through our custom sizes form.

The sizes of the other pieces on the bed are in our guides to UK duvet sizes and UK pillow sizes, and all of them are together in the UK bed size guide.

Bed sheet size questions

What size is a double fitted sheet in the UK?

A UK double fitted sheet is 135 × 190 cm, the size of a double mattress. Ours are cut for mattresses up to 35 cm deep.

What size is a king size fitted sheet?

A UK king size fitted sheet is 150 × 200 cm, to fit a 5 ft king mattress.

What size is a super king fitted sheet?

A UK super king fitted sheet is 180 × 200 cm, to fit a 6 ft super king mattress. It is the same as a European 180 × 200 cm sheet.

What size is a single fitted sheet?

A UK single fitted sheet is 90 × 190 cm, to fit a 3 ft single mattress.

What size flat sheet do I need for a double bed?

A double flat sheet. Ours is 230 × 260 cm, which covers a 135 × 190 cm mattress and leaves enough on each side to tuck under.

Will a double fitted sheet fit a small double bed?

It will go on, but loosely. A double sheet is 135 cm wide and a small double mattress is 120 cm, so there is about 7 cm of slack on each side to tuck under.