Before selecting the perfect bed for your master or guest bedroom you need to ensure you’ve chosen a bed that fits the room. After all, the last thing you want is to get your bed home, only to realise it’s a couple of cms too long and won’t fit into the space earmarked for it!
King size beds are increasing in popularity, as people love the idea of extra space to stretch out in at night. But just how big is a king size bed? Let’s take a look now.
How big is a king-sized bed in feet?

In the UK, a king size bed is 5ft wide x 6ft 6in long. Compared to a standard double, which is 4ft 6in x 6ft 3in, it’s clear that a king-sized bed provides a generous amount of additional space.
This makes it ideal for heavy-set couples, tall, or those that like just a little bit of extra space during the night!
That being said, providing your room is big enough, anyone can enjoy sleeping in a king size bed, and it’s not just for couples or bigger people.
How big is a king-sized bed in cm?

In cm, a king size bed is 150cm wide x 200cm long. In terms of the depth or height of a king-sized bed, it depends upon the style of the bed that you opt for. You will need to consider the depth of your mattress, as well as the slats and foundation of the bed itself.
Lots of beds have deep bases that provide sufficient storage space, which naturally increases the depth of your bed. But at the same time, you can opt for a shallow king size bed if you’re not keen on sleeping on a high surface.
How long is a king-sized bed?
A king size bed in the UK is 6 ft 6 in long (or 200cm). That’s a sufficient length for the vast majority of the population and ensures your feet won’t be dangling off the end of the bed throughout the night.
However, if you’re taller than 6 ft 6in, you will find that some retailers offer super king beds and even custom-made products for those that are even taller. You’ll need to do a little bit of research, since even super king size beds are still 6ft 6in long, which is the same length.
Frankly, there’s nothing more important than purchasing a bed with enough space for you and your partner, so be sure to do your research and find a bed that will comfortably accommodate your height and width.
How to measure a king-size bed?
Keep in mind, that a king size bed fits a mattress that is 6’6″x5′, however the bed frame is a little bit bigger than that. The headboard and frame of the bed add additional inches or centimeters to the overall width and length of the bed.

In the picture above you can see the Sana Ottoman Bed Frame. This is a front opening ottoman, with internal storage depth of 19cm, which is very convenient if your bedroom is short on storage space. Here are the exact dimensions of the Sana bed:
- (A) Headboard is 120cm (48 inches) high.
- (B) Length of the bed is 215cm (85 inches).
- (C) Width of the bed is 162cm (65 inches).
- (F) Headboard is 165cm (66 inches) wide.
You will need to factor in additional 15cm to the length of the bed and 15cm to the width of the bed. Each bed frame model has different dimensions, so make sure you double check them when calculating how much room you have in your bedroom.
Is a king-sized bed right for you?
As we’ve explored, a UK king size bed is an excellent option for anyone looking for some extra space during the night. At 5ft x 6ft 6in (150cm x 200cm), king-sized beds should provide sufficient space for most couples.
If you want to check out other options, here are the dimensions of a double, king and super king size beds, so you can compare them:
- Double size bed measures: 6’3″ long x 4’6″ wide (135cmx190cm).
- King size bed measures: 6’6″ long x 5′ wide (150cmx200cm).
- Super king size bed measures: 6’6″ long x 6′ wide (180cmx200cm).
When making up your choice on what is the right size bed for your bedroom, make sure you have enough space to cater for the additional space a king size bed takes up, so you can enjoy the large space afforded by a king size sleep surface.