For a UK king bed at 150cm by 200cm, a throw of around 200cm by 220cm is the most useful size. It spans the full mattress width with enough left over to hang down both sides, and it is long enough to cover a sleeper properly rather than only decorating the foot of the bed.
If the throw is purely decorative and will sit folded across the end, something around 170cm by 200cm is enough. If you want the fabric to drape all the way toward the floor on both sides, look at 220cm by 240cm or larger. Below about 150cm wide, a throw will not span a king mattress and will always look undersized.
A king mattress is 15cm wider than a double, but the throw you need is often 40cm or 50cm wider. That is because drape is proportional. On a wide bed the eye reads a short overhang as a mistake, whereas on a narrower bed the same overhang looks intentional.
Depth compounds this. Many king mattresses are 25cm to 32cm deep, and on a divan or ottoman base the total height from floor to mattress top can approach 65cm. A throw has to clear the mattress depth before it starts to hang, so a good part of the extra width disappears down the sides of the mattress before any visible drape begins.
The frame style matters too. A padded upholstered surround adds width that a throw has to cover, so beds in our modern fabric beds UK sale range often suit a larger throw than a slim wooden frame of the same mattress size.
Folded across the foot is the most restrained option and the easiest to keep tidy. Fold the throw to around a third of the bed length and lay it so it spans the full mattress width with a small overhang. This works well in a busy household because the throw stays where it is put.
Draped across the whole bed gives the softest, most layered result. Lay the throw from just below the pillows and let it fall over both sides. This needs the larger sizes, and it works best on a bed with some height, since the drape has somewhere to go.
Draped from one corner introduces asymmetry, which suits a scheme that is otherwise very symmetrical. On a king bed, the diagonal fall covers a lot of ground, so a mid weight throw handles this better than a heavy knit, which will look bulky.
Scale changes how a fabric reads. A chunky knit that looks charming on a single bed can look overwhelming across a king, because the stitch pattern grows in visual weight with the area covered. If you want a knit on a king bed, a medium gauge usually sits better than a very chunky one.
Wool holds a crisp fold and suits the folded arrangement. It is warm for its weight and hard wearing, though it needs careful washing. Cotton is easier to launder and breathes well, making it a good year round choice for a bed that is actually used rather than only styled.
Linen creases readily and gives a relaxed finish, which either suits your scheme or does not. Faux fur and heavy fleece deliver obvious warmth and softness, but across a king they cover a large area and can dominate a room, so they work best where the rest of the scheme is quiet.
Weight is the practical consideration on a large throw. A very heavy throw at 220cm wide is difficult to shake out and slow to dry, and it will stretch if hung wet. Mid weight fabrics are easier to live with at this scale.
A king bed is the largest single object in most bedrooms, so a throw across it becomes a major block of colour. That gives you two workable strategies.
The first is tonal, keeping the throw within a shade or two of the bedding and walls so the bed reads as one calm mass. This suits smaller rooms and darker schemes, where a strong contrast would make the bed look even larger.
The second is a deliberate single contrast, using the throw as the only strong colour in the room. This works when the walls, bedding and furniture are restrained, and it means you do not need much else in the way of decoration. On darker frames, such as those in our modern leather beds UK range, a lighter throw provides that contrast without introducing a new colour at all.
Either way, keep the number of textures on the bed to three or four. Bedding, pillows, cushions and throw is already four layers, so adding more starts to look cluttered rather than considered.
On a king bed, two standard pillows span 148cm and sit almost exactly across the mattress. Add a pair of European square pillows behind them and two smaller cushions in front, and the head of the bed is comfortably full without excess.
Position the throw so it begins below the cushion arrangement rather than tucking behind it. A throw that disappears under the pillows looks unfinished from the side. If the bed sits against a tall headboard, leaving a clear band of duvet visible between the cushions and the throw gives the layers definition.
A blanket box or ottoman at the foot of the bed is useful here, since it gives the throw somewhere to live at night. There are options across our blanket box UK sale range, and you can see how throws and bedding work with different frames across the bedroom collection at Furniture in Fashion UK.
Large throws stress domestic washing machines. Check the drum capacity before washing a 220cm wool or faux fur throw, since an overloaded machine cleans poorly and the weight of a saturated throw can distort it. Many large throws are better handled professionally.
Where you can wash at home, use a low temperature and a slow spin. Dry flat rather than hanging, because a wet throw of this size carries enough weight to stretch permanently along whichever edge takes the load. Fold for storage rather than hanging over a rail.
Between washes, airing does most of the work. Take the throw off the bed, shake it out and leave it over a chair for a few hours. Wool in particular freshens well this way and lasts longer for fewer washes.
On a king bed the drop is what decides whether a throw looks deliberate or accidental. Measure from the top surface of the mattress down to where you want the fabric to finish, whether that is the base of the mattress, halfway down the divan or close to the floor. Double that measurement and add the 150cm mattress width to find the width you actually need.
For a modest 25cm drop on both sides, that means around 200cm of width. For a fuller look that covers the base, you are into 230cm and beyond. Working from the drop rather than the label is the only reliable way to buy at this size, because manufacturer sizing varies far more on large throws than on small ones.
Large throws behave differently from small ones. A lightweight fabric at king width tends to lift and slide, because there is more surface area and less weight holding it in place. A heavier weave settles into folds and stays where you put it, which is why substantial wool and cotton throws look better on big beds even before you consider warmth.
If you like the look of a lighter fabric, tuck the top edge under the duvet fold rather than laying it loose. That single anchoring point stops most of the movement without changing how the throw reads from the end of the bed.
On a bed this wide, two throws laid side by side or one folded across the foot with a second draped diagonally can work better than a single enormous piece. It gives you more control over how much of the bed is covered, and it is often cheaper than buying one throw large enough to span the full width with a generous drop.
Keep both in the same colour family and vary the texture rather than the shade. Two different weaves in similar tones look considered, while two strong contrasting colours on a large bed tend to compete with each other.
Around 200cm by 220cm is the most practical size, covering the 150cm mattress width with enough left to drape down both sides.
Only folded at the foot, and even then it may look narrow. A double throw at around 150cm wide will not span a king mattress with any overhang.
Not necessarily. A related tone in a different texture usually looks better than an exact match, which can make the layers disappear into one another.
Tuck the top edge under the folded duvet and choose a mid weight fabric. Very light throws slide most easily on smooth cotton bedding.
Sometimes, but check the drum capacity and the care label. Heavy wool and faux fur throws at king size are often better cleaned professionally.
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