Written By: Michal Szlas
Michal Szlas is the founder of OTTY Sleep and a lifelong sports enthusiast who understands the critical role quality sleep plays in recovery and performance. With his extensive background in sports and passion for optimizing sleep, Michal is a trusted authority dedicated to helping you achieve better, more restorative sleep every night.
Pillow sizes in the UK aren't standardised in the way you might expect, and buying the wrong size is an easy mistake to make — especially when shopping online. Whether you're replacing old pillows, buying pillowcases, or setting up a new bed, this guide covers every UK pillow size, how they match to your bed, and how to choose the right one for the way you sleep.
UK Pillow Sizes
| Pillow Type | Size (cm) | Size (inches) |
|---|---|---|
| Standard | 50 x 75cm | 20" x 30" |
| King / Super King | 50 x 90cm | 20" x 35" |
| Emperor | 50 x 100cm | 20" x 39" |
| Large Emperor | 51 x 107cm | 20" x 42" |
| Square (Continental) | 65 x 65cm | 26" x 26" |
| Toddler / Cot | 40 x 60cm | 16" x 24" |
| Body Pillow | 45 x 150cm | 18" x 59" |
Which Pillow Sizes Fit Which Bed?
| Bed Size | Mattress Width | Recommended Pillow | Combined Width |
|---|---|---|---|
| Single | 90cm | 1 x Standard | 75cm |
| Double | 135cm | 2 x Standard | ~150cm |
| King | 150cm | 2 x Standard | ~150cm |
| Super King | 180cm | 2 x King | 180cm |
| Emperor | 200cm | 2 x King or Emperor | 180–200cm |
Standard Pillow Size UK
The standard UK pillow measures 50cm x 75cm. This is by far the most common size and fits the majority of pillowcases sold in the UK. If you're not sure what size to buy, standard is almost always the right answer — it works on single, double, and king-size beds without looking oversized or lost.
King Pillow Size UK
A king size pillow measures 50cm x 90cm, making it 15cm wider than a standard pillow. In the UK, king and super king pillows are the same size — the naming is interchangeable, unlike in the US where they're different products entirely.
King pillows are worth considering if you have a super king or emperor bed, where two standard pillows can leave a visible gap across the width of the mattress.
Emperor Pillow Size UK
Emperor pillows come in two variants:
- Emperor: 50cm x 100cm
- Large Emperor: 51cm x 107cm
These are less commonly stocked but are a proportionally better fit for emperor-sized beds (200cm x 200cm). If you're furnishing an emperor bed and want it to look finished rather than sparse, large emperor pillows are the practical choice.
Pillow Size and Sleeping Position
Your sleeping position should influence both the size and firmness of your pillow, but the two aren't always linked in the way you'd expect:
Side sleepers need a higher loft to fill the gap between the ear and the shoulder, keeping the spine neutral. A fuller, deeper pillow — like OTTY's Adjustable Pillow — allows you to dial in exactly the right height rather than relying on size alone. Take a look at our mattresses for side sleepers.
Back sleepers generally need a medium loft. A standard size pillow with medium firmness works well for most back sleepers; going too wide can push the head forward. Check out our mattresses for back sleepers to go with your pillow.
Stomach sleepers need the thinnest, softest option available. A large pillow forces the neck into extension, which accumulates strain overnight. A flatter standard-size pillow is the better fit. Take a look at our mattresses for stomach sleepers.
Pillow Size and Pillowcases: What to Check
A common frustration is buying pillowcases that don't fit. UK pillowcases are sold to match standard and king pillows specifically, so check sizing before you buy:
- Standard pillowcases: fit 50 x 75cm pillows
- King pillowcases: fit 50 x 90cm pillows
- Continental/square pillowcases: fit 65 x 65cm pillows
- Emperor pillowcases: less commonly stocked — measure your pillow before ordering
An oversized pillowcase on a standard pillow bunches at the end; an undersized one won't close properly and the pillow will work its way out during the night.
Why Choosing the Correct Pillow Size Matters
Choosing the correct pillow size is more than just a matter of personal preference. It's a crucial factor that can significantly impact your sleep quality and overall bedroom aesthetics.
Improved Comfort
A correctly chosen pillow supports your neck and aligns your spine, reducing discomfort, aches, and ensuring you wake up refreshed.
So, consider your sleep position and the pillow size to ensure maximum comfort.
Enhancing Bedroom Aesthetics
Choosing the right pillow size isn't just a matter of comfort. It's an essential aspect of enhancing your bedroom aesthetics. The diversity in pillow sizes, from standard to super king, allows you to curate a unique, visually appealing bed setup.
Your bed is the focal point of your room. Therefore, it's essential to harmonise the proportions. An oversized super king pillow on a single bed or a tiny cushion on a king-size bed, for example, can throw off the balance.
Prolonging Pillow and Pillowcase Lifespan
It's a lesser-known fact that it pillow size also affects pillow lifespan. With oversized ones and hyper compact ones, wear-and-tear is inevitable.
In addition to right sizing, regular pillow swaps every 1-2 years are also necessary for a prolonged lifespan.
What if my pillow doesn't match my bed size?
It's important to note that pillows don't necessarily have to align with bed sizes. It's all down to personal comfort. For instance, individuals may tend towards standard pillow size for a king bed, purely out of convenience.
However, keep in mind that using a pillow size equal to the bed width could lead to strain on your neck. It's advisable to experiment and figure out what's most comfortable for you.
Can I mix and match pillow and pillowcase sizes?
Absolutely, mix and match of pillow and pillowcase sizes is an imaginative way to give your bed depth and style and provide more comfort.
Summary and Takeaways
Choosing the right pillow size comes down to three things: your bed size, your sleeping position, and your pillowcase setup. For most people on a single, double, or king bed, a standard pillow (50 x 75cm) is the right fit. If you've got a super king or emperor bed, upgrading to king size pillows (50 x 90cm) gives you proper coverage across the width. Emperor and large emperor pillows are a niche but worthwhile option if you want everything proportioned correctly on a larger bed.
Beyond size, the fill and firmness of your pillow matters just as much — a correctly sized but poorly supported pillow will still leave you waking up stiff. If you're not sure where to start, OTTY's Adjustable Pillow takes the guesswork out of loft height entirely, letting you customise support to your sleeping position rather than working around a fixed size.
