For a UK king size bed measuring 150cm by 200cm, a throw of around 220cm by 240cm gives full coverage with an even drape on both sides. If you only want a throw folded across the foot of the bed, something in the region of 130cm by 180cm is enough. Anything smaller than 150cm wide will look stranded on a king mattress, because the throw needs to clear the width of the bed before it can hang at all.
Throw sizes are far less standardised than bedding, which is why the same label can mean two quite different things. One brand calls 125cm by 150cm a throw, another uses the word for a 240cm blanket. The measurement in centimetres is the only reliable guide, so it is worth checking it before anything else.
Choosing a size is easier once you know the job the throw is doing. There are three common arrangements, and each needs a different piece of fabric.
The first is full coverage, where the throw sits over the whole made bed like a light bedspread. For a king, that means 220cm by 240cm or larger, allowing roughly 35cm to 45cm of overhang each side. This is the arrangement that makes a bed look finished from the doorway, and it also hides bedding that has seen better days.
The second is the foot of bed fold, where the throw lies across the lower third of the mattress. Here you want the throw to be wider than the bed so the ends fall softly rather than stopping short. A width of 180cm to 200cm works well on a king, with a length of 130cm to 150cm.
The third is the diagonal or one side drape, popular in photography and useful in real life if you like a blanket you can pull over yourself while reading. A rectangle around 150cm by 200cm suits this, laid corner to corner or hanging from one side only.
A UK king mattress is 150cm wide. Standard mattress depths run from about 20cm to 30cm, and many people add a mattress topper on top of that. Once the throw has crossed the 150cm of mattress width, it needs enough length left on each side to fall past the mattress edge and preferably a little way down the base.
With a 220cm wide throw, you have 70cm of fabric to share between two sides, so 35cm each. That is enough to cover a 25cm mattress and reach slightly below it, which is the point at which a throw stops looking like a rug on top of a bed and starts looking intentional. If your mattress is unusually deep, or if you have a divan base you want covered, move up to 240cm or 250cm wide.
Length matters less, since the pillows take up the top of the bed and most people fold the throw back below them. A 240cm length lets you cover the foot of the mattress and still turn the top edge over neatly.
Two throws of identical size can look completely different depending on what they are made from. Heavy chunky knits hold their shape, sit proud of the bed and create deep folds, which suits a large king bed with a tall headboard. They also take up visual space, so in a smaller room they can feel bulky.
Cotton, linen and lightweight woven throws fall closer to the bed and read as calmer. Linen creases readily, and for most rooms that softness is part of the appeal rather than a fault. Wool sits between the two: warm, dense, and better at holding a crisp fold than cotton.
Faux fur and boucle are the most decorative options and work best in smaller pieces, folded at the foot rather than spread over the whole bed, where they can overwhelm everything else. Whichever fabric you choose, pick something you will actually use. A throw that never leaves the bed because it sheds or scratches is simply expensive decoration.
The bed frame sets the tone. A padded fabric frame already brings softness to the room, so a flat woven throw in a close tone keeps things restrained. Our modern king size fabric beds UK sale range covers everything from low profile designs to deep buttoned headboards, and the taller the headboard, the more generous the throw can be without looking heavy.
Against a wooden or metal frame, texture in the throw does more work, since there is less upholstery in the room to soften the lines. A chunky knit or a wool weave in a warm neutral bridges the gap between hard frame and soft bedding.
Colour is simpler than it looks. Choose either a shade close to the bedding for a quiet layered effect, or one clear contrast tone that also appears somewhere else in the room, such as a rug or a chair. Picking up a tone from one of our modern rugs UK sale options is an easy way to make the whole room feel considered rather than assembled piece by piece.
A king bed can carry more layers than a double, but there is still a limit. A workable formula is one duvet, two to four pillows, two to three cushions and one throw. Beyond that, making the bed becomes a chore and the layers stop reading as deliberate.
If you want two throws, keep them different in weight and scale: a large flat one over the bed and a smaller textured one folded at the foot. Matching pairs tend to look staged.
Give the throw somewhere to live when the bed is in use. A blanket box at the foot of the bed is the traditional answer and still the most practical, since it keeps the throw within reach and off the floor. Our modern blanket box UK designs double as seating, which is useful in a main bedroom. An upholstered bench or one of our ottomans UK sale pieces does the same job while adding storage underneath.
If your bed is actually a super king at 180cm wide, the numbers shift. Full coverage there needs around 250cm to 270cm of width, since the same 35cm of overhang each side has to start from a wider mattress. A throw bought for a king will look noticeably mean on a super king, so it is worth measuring the mattress rather than relying on what the bed was described as when you bought it.
Beds are sometimes sold as king in general conversation when they are a different size entirely. A quick measurement across the mattress settles it: 135cm is a double, 150cm is a king and 180cm is a super king.
Check the care label before buying, particularly with wool and faux fur. Many throws are hand wash or dry clean only, and a large throw is heavy when wet, which puts strain on the fibres if you wring it out. Wool throws benefit from airing rather than frequent washing.
Fold along the same lines each time and the throw will keep its shape for years. Store it out of direct sunlight, since strong light fades dyes on the exposed fold first, leaving a stripe that shows once the throw is opened out. A drawer, a blanket box or a lidded ottoman all solve that.
We stock bedroom furniture designed to work together, from king size frames and mattresses to storage pieces that keep bedding tidy. Browsing Furniture in Fashion lets you see frame proportions and finishes before you commit to a throw size, which is the sensible order to do it in. We offer free delivery to most UK mainland postcodes, and Returns are available up to 30 days.
For a folded throw at the foot of the bed, 180cm wide is the sensible minimum on a 150cm mattress. For full coverage, do not go below 220cm wide, or the drape will be uneven and shallow.
Usually not. A throw that reaches the floor behaves like a bedspread and will drag when you get in and out. Aim for the fabric to finish a little below the mattress edge, leaving the base visible.
Yes. Single and double blankets are often close in size to large throws, and a double blanket at around 200cm by 230cm works well across a king bed. Check the measurement rather than the size name.
Two to three cushions in front of the pillows is enough alongside a throw. More than that and the bed takes longer to make than it is worth, and the throw stops being the focus.
No. It is more effective to relate the throw to something on the floor or the seating, such as a rug or a chair, and let the curtains sit quietly in the background.
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