King Size Duvets UK | 4.5 to 15 Tog Available

Sized to fit a standard UK king bed properly — no gaping at the corners, no dragging on the floor. Choose your tog rating below, from light summer weight through to full winter warmth.

King duvet dimensions

A UK king size duvet typically measures 230 x 220 cm. This is noticeably larger than a king size bed base or mattress itself, since a duvet needs enough overhang on both sides and at the foot of the bed to stay in place through the night rather than sitting flush to the mattress edge.

Choosing a tog rating for a king bed

Tog rating works the same way regardless of duvet size — it's a measure of warmth, not size. For a king bed specifically, it's worth considering that more surface area means more heat retention overall, so some people find they're comfortable half a tog or so lower than they would choose on a smaller bed. As a general starting point:

  • 4.5 tog — for warmer nights or hot sleepers
  • 10.5 tog — a practical year-round option for most centrally heated bedrooms
  • 13.5 tog — suited to colder rooms or the depths of winter
  • 15 tog — for those who feel the cold most, or very cold bedrooms

King vs. super king — checking you've got the right size

King and super king duvets are easy to mix up when shopping online, since the size names sit right next to each other. A UK king bed measures 152 x 203 cm, while super king measures 183 x 203 cm — a 31 cm difference in width. If you're not certain which you have, measuring your mattress directly is more reliable than going by memory or the size listed when the bed was originally purchased.

Do you need a duvet set, or just the duvet?

Some retailers bundle a duvet with a cover and pillowcases as a "duvet set." What you'll find on this page is the duvet itself only, sold separately from any cover, which gives you the flexibility to pair it with whichever duvet cover design or colour you actually want, rather than being locked into a fixed bundle.

FAQ

How big is a king size duvet in cm?
A UK king size duvet measures approximately 230 x 220 cm, which is larger than the king bed and mattress dimensions themselves to allow for proper overhang on the sides and foot of the bed.
Will a king duvet fit a super king bed?
Not comfortably. A king duvet is sized for a king bed specifically, and using it on a super king bed will likely leave the sides too short to tuck or hang properly. Sizing up to a super king duvet is the better option in that case.
What tog is best for a king bed in a UK winter?
13.5 tog is a common choice for winter on a king bed, though 15 tog suits colder rooms or those who feel the cold more. Since a king bed has more surface area than smaller sizes, some people find they're comfortable slightly lower on the tog scale than they'd expect.
Does this include a duvet cover?
No, this listing is for the duvet itself only. This lets you choose a cover separately in whichever colour or fabric suits your bedroom, rather than being tied to a fixed set.
Can I use a lighter tog on a king bed in summer?
Yes, a 4.5 tog king duvet is a common choice for warmer months, and switching between a lighter and heavier tog seasonally is a normal approach rather than sticking to one rating year-round.