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How Long is a King Size Mattress

Selecting the right king size mattress is pivotal for a restful night. One of the first questions that arises when considering a king size mattress is, how long is it? Let’s explore this in more detail.

How long is a king size mattress?

The king size mattress dimensions in the UK are 150cm in width and 200cm in length. This equates to roughly 5 feet in width and approximately 6.6 feet in length. While these are standard measurements, there can sometimes be a slight variance of up to 2cm. So, when planning to buy king size mattress, always ensure you check the specific measurements.

Choosing the right king size mattress for you: A checklist

When looking at king-size mattresses, it’s not just about the length and width. Here’s a detailed look at what you should consider:

Who the bed or mattress is for

  • Is this king size mattress for a couple, a teenager, or a guest room? Depending on the user, you might want different levels of firmness or support.

How tall you are

For those over 6 feet tall, a king size mattress offers the extra length, ensuring feet aren’t hanging over the edge.

Your available space

  • Before you buy king size mattress, it’s essential to measure your bedroom. A king size mattress needs ample space around it, not just for aesthetic purposes but also for ease of movement.

Whether you’ll be sharing the bed

  • For couples, a king size mattress ensures each person has their own space. You might also consider a mattress that minimises movement transfer so that one person’s movements don’t disturb the other.

Preferred feel

  • Whether you enjoy a plush, medium, or firm feel will influence your choice. This is especially important if you’re planning to spend long hours on the bed, reading or watching TV.

Required spring tension

  • Your weight and sleeping habits will determine the spring tension you need. Heavier individuals might opt for firmer springs.

Medical ailments

  • For those with back or joint pains, certain king size mattresses offer orthopaedic support.

Understanding different mattress sizes

When it comes to sleeping, comfort and space play pivotal roles. By comparing the mattress king size to other dimensions, you can better discern what suits your individual or familial needs. Here’s a more detailed breakdown:

Single mattresses

  • 90cm x 190cm (35 x 75 inches): Typically used for children’s bedrooms, guest rooms, or smaller spaces. It’s a snug fit, providing cosy comfort for solo sleepers. Great for those who have limited space but desire the comfort of a proper bed.

Small double mattresses

  • 120cm x 190cm (47 x 75 inches): Also known as a three-quarter bed, it’s a step up from the single. This mattress provides more width, making it a preferred choice for teenagers, single adults, or guest rooms where space might be a bit tight but a double bed is too large.

Double mattresses

  • 135cm x 190cm (53 x 75 inches): One of the most common sizes for adults, it offers ample space for single sleepers and is sufficiently roomy for couples who don’t mind snuggling up. It fits comfortably in most standard bedrooms.

King size mattresses

  • 150cm x 200cm (59 x 79 inches): A preferred choice for couples who seek more width. The additional length also benefits taller individuals, ensuring their feet don’t dangle off the bed. It allows both individuals ample space to stretch out.

Super king mattresses

  • 180cm x 200cm (71 x 79 inches): For those who crave luxury and space, the super king is a dream. It’s especially fitting for families; parents with young children who have nightmares can comfortably co-sleep. Also, pet owners who share their bed with larger pets will find this size accommodating.

Emperor mattresses

  • 200cm x 200cm (79 x 79 inches): This is the epitome of spacious luxury. If your room can accommodate it, the emperor ensures you have copious amounts of space, whether you’re a solo sleeper wanting opulence or a couple preferring maximum space.

Large emperor mattresses

  • 215cm x 215cm (85 x 85 inches): Offering even more width and length than the standard emperor, this mattress is a statement of luxury and spaciousness. Perfect for grand master bedrooms and those who want the finest sleeping experience.

When considering a new mattress, size is crucial, but so are factors like firmness, material and the bed base. Remember always to measure your space and factor in bedroom furniture before deciding.

Which king size mattress is best for you?

Selecting the right king size mattress is not just about dimensions; it’s about tailoring your choice to personal preferences, needs and constraints. Let’s delve into the nuances:

Sleeping Partner(s)

  • Sharing a bed can be a blissful experience, or a nightly wrestling match. When choosing a king size mattress, consider the sleep habits of both individuals. Do you or your partner toss and turn? Does one person usually sprawl out while the other curls up? The perfect mattress will accommodate both of you, ensuring you wake up refreshed without infringing on each other’s space. Think about motion transfer: if one person moves, will the other feel it? Some king size mattresses have advanced technology to minimise this.

Your Physical Profile

Your body type and preferred sleeping position play significant roles.

  • Side sleepers: Generally, they might lean towards a softer mattress that cushions the shoulders and hips. This alignment helps maintain the spine’s natural curve.
  • Back sleepers: A medium-firm mattress can offer the right balance, supporting the lower back while providing comfort.
  • Stomach sleepers: They often need a firmer mattress to keep the spine aligned and prevent the pelvis from sinking.


  • Heavier individuals might need a firmer mattress for adequate support, while lighter individuals could opt for something softer. Remember, weight distribution affects how much pressure you put on a mattress, which in turn impacts its longevity and the support it offers.


  • Venturing into the realm of king size mattresses invariably means a higher budget. As dimensions increase, so does the price. But a king size mattress is an investment in your sleep and overall well-being. However, be prepared: aside from the mattress itself, larger bed frames, sheets, duvets and protective covers will also come with added costs. It’s essential to factor these into your budget to avoid unpleasant surprises.

Bedroom Size

  • While the allure of a king sized mattress is undeniable, your bedroom should harmoniously accommodate it. A cramped bedroom can make your sleep sanctuary feel more like a cell. As a guideline, try to maintain at least 24 inches of space around all sides of the mattress. This ensures you can move around comfortably, clean easily and the room feels spacious and balanced. Moreover, think about other furniture in the room: bedside tables, wardrobes and any additional seating. All these need to coexist with your mattress without making the space feel congested.

Your king size mattress is more than just a place to sleep; it’s a pivotal element in ensuring restful nights and energetic days. Tailor your choice to your unique needs for the best results.

In summary

The length and width of the kingsize mattress make it a favourite choice for many. But it’s vital to consider various factors, from bedroom size to personal preferences, before making a purchase. Dive deep into your needs, do thorough research and find the ideal king size mattress that promises serene slumbers.

Published: 16th September 2023 (Updated: 16th September 2023) | Isaah

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