King vs Super King Which Bed Size Gives You More Space
Need more sleeping space but worried about room size? Compare King vs Super King dimensions and see if the extra 30cm is worth it.
30cm Sounds Small Until Two People Share It
It is late. You turn towards your side, your partner shifts too, and suddenly you both want the same little patch of mattress. A UK king measures 150 × 200cm, while a super king measures 180 × 200cm. That means you get 30cm more width, with the same 200cm length.
You might think, “It’s only 30cm.”
But when you and your partner share a bed, those extra centimeters sit right where you need them — around your shoulders, arms and legs. You can turn without bumping into each other. You can stretch out without feeling like you are stealing their space.
And that is where the real question starts.
Is that extra 30cm worth giving your bed more floor space — and potentially spending more on the bed and mattress?
To answer that, I’d start with the numbers. Once you see the difference side by side, the choice becomes much easier.
King vs Super King Dimensions at a Glance
A UK king mattress is 150 × 200cm (5ft × 6ft 6in). A super king mattress is 180 × 200cm (6ft × 6ft 6in). So, you gain 30cm of width, not extra length.
- King: 150cm wide × 200cm long — 5ft × 6ft 6in
- Super King: 180cm wide × 200cm long — 6ft × 6ft 6in
- Width difference: 30cm
- Length difference: 0cm
- Extra width per person: about 15cm when shared equally
There is one detail you should not miss. These are mattress dimensions, not necessarily the full footprint of your bed frame. A headboard, footboard or side rails can make the finished bed larger.
So, if you are measuring your bedroom, do not stop at the mattress size. You need to check the actual bed dimensions too.
And once you put those extra 30cm into a real bedroom, the difference starts to feel much bigger than it looks on paper.
What Does 30cm of Extra Width Actually Give You?
A Super King gives you 30cm more width than a King. When shared equally, that is roughly 15cm more space per sleeper.
15cm More Personal Space Each
That extra room can give you more freedom to move without making the bed feel as shared.
- More room for your shoulders and arms
- Easier position changes
- Extra space for stretching out
- More personal room between partners
If you and your partner often drift into each other's space, those 15cm can feel useful. However, every sleeper will notice the difference in their own way.
Where the Extra Width Matters Most
- Restless sleepers who change position often
- Couples who prefer more personal space
- Sleepers who stretch out across the mattress
- Couples who sometimes share the bed with children or pets
When Extra Sleeping Space Changes the Night
For some couples, moving from a 150cm King to an 180cm Super King can make the sleeping surface feel less crowded. The benefit is simply having more room to move and settle.
The Couple Who Needed More Personal Space
Imagine a couple whose King feels cramped at night. After repeated movement and lost personal space, they measure their bedroom for a Super King.
The extra 30cm may solve the space issue — if the larger bed still fits comfortably in the room.
Restless Sleepers and Shared Beds
A wider bed gives each person more physical space to move. It does not guarantee better sleep, but it can make a shared sleeping surface feel less restricted.
Bedroom Footprint Changes the Decision
A Super King is 30cm wider, so it uses more floor space. Before choosing one, check how comfortably it fits with your furniture and walking routes.
King Leaves More Room Around the Bed
A King leaves 30cm more width elsewhere in your bedroom. That can help you fit:
- Bedside tables
- Wardrobes and drawers
- Clear walking routes
- Doors that need to open fully
If your bedroom already feels tight, a King may give you a more practical layout.
Super King Needs More Careful Planning
Before buying a Super King, measure the full space around your bed, not just the mattress.
- Check your headboard and side rails.
- Allow space for storage features.
- Check doors, wardrobes and windows.
- Consider radiators and walking routes.
- Measure the actual frame dimensions before ordering.
Mattress Size vs Bed Frame Size: Why 30cm Is Not the Whole Story
The 150 × 200cm King and 180 × 200cm Super King measurements describe the mattress. The finished bed frame can be larger.
Headboards, upholstery, side rails, footboards and storage systems can all add to the footprint.
Before ordering, measure the actual frame dimensions from the manufacturer, not just the mattress size.
Does a Super King Actually Feel More Comfortable?
A Super King gives you more sleeping space, but size alone does not improve mattress support. Your comfort also depends on firmness, construction, and personal preference.
- More space: Gives you more room to move.
- Mattress support depends on the mattress, not the bed size.
- Spinal health: Proper support varies from one individual sleeper to another.
- Your preference: Choose the size that suits how you sleep.
Bedding, Accessories and Everyday Practicality
Changing from King to Super King also means changing your bedding. Each size needs accessories designed to fit its mattress dimensions.
King Bedding Is More Compact
King mattresses need correctly sized King fitted sheets and duvet covers. Check mattress depth too, especially with deeper mattresses.
- King fitted sheet
- King duvet cover
- King mattress protector
- Correct depth for your mattress
Super King Bedding Needs More Space
A Super King needs Super King bedding, including fitted sheets, duvet covers and mattress protectors. Check availability before buying.
- Super King fitted sheet
- Super King duvet cover
- Super King mattress protector
- Correct mattress depth
When Is the Extra 30cm Actually Worth It?
The extra 30cm is worth considering when you need more sleeping space, your bedroom can handle the larger footprint, and your budget allows it.
- Worth it if: You and your partner want more personal space.
- Worth it if: Your bedroom comfortably fits the larger frame.
- Probably not if: Your current King already feels spacious.
- Probably not if: The wider bed makes furniture or movement difficult.
A 150cm King becomes an 180cm Super King, giving you 20% more mattress width. The right choice depends on how useful that extra space feels in your room.
King or Super King: Which Should You Choose?
Your choice comes down to three things: sleeping space, bedroom space, and budget. Neither size is automatically right for everyone.
Choose King If Your Bedroom Needs Flexibility
Choose a King if you need more floor space, easier movement around furniture, or do not need maximum shared sleeping width.
Choose Super King If Sleeping Space Comes First
Choose a Super King if you have room for its wider footprint and want more personal space while sharing the bed.
Measure Before You Order
Measure your bedroom, actual frame footprint and walking routes. Check bedside tables, wardrobes, doors and delivery access too.
The Final Verdict
A Super King is worth considering when sleeping space matters more than the extra floor space. You gain 30cm of width while keeping the same 200cm mattress length.
If your King already feels spacious, keeping the narrower size may make more sense. If you and your partner need more room, measure your bedroom and compare the actual frame dimensions to the new dimensions before upgrading.
FAQs
Is a Super King 30cm Wider Than a King?
Yes. A King is 150cm wide, while a Super King is 180cm wide. Both standard UK mattress sizes are 200cm long.
Is 30cm Enough to Notice on a Bed?
Thirty centimeters adds useful sleeping space across the mattress. How noticeable it feels depends on your sleeping habits and personal space needs.
Is a Super King Better for Couples?
A Super King gives couples 30cm more shared width. It can offer more personal space, but your bedroom must also fit the larger footprint.
Are Super King Mattresses More Expensive?
Price depends on mattress size, construction, materials and brand. A Super King may cost more, but there is no fixed price difference.
Can I Use King Bedding on a Super King?
No. Fitted sheets must match the mattress dimensions. A Super King needs Super King bedding, including sheets, duvet covers and protectors.
Is a Super King More Comfortable Than a King?
A Super King gives you more sleeping space, but comfort depends on mattress support, firmness, construction and your personal sleeping preference.