King Size vs Super King Mattress: Depth and Comfort Guide
When comparing a king size vs super king mattress, depth directly affects compatibility with your bed frame, the drape of your duvet and the overall luxury feel. A standard king measures 150x200cm (5ft) while a super king is 180x200cm (6ft).
Understanding UK King and Super King Mattress Sizes
UK king size mattresses are 150x200cm, providing 30cm more width than a standard double (135x190cm). Super king mattresses measure 180x200cm, adding another 30cm of width for couples who want space to spread out without disturbance. Both share the 200cm length, which is 10cm longer than the 190cm found on smaller sizes. EU equivalents differ: an EU double is typically 140x200cm and an EU king 160x200cm, so always confirm exact dimensions on the product page before ordering from UK retailers.
Depth is the vertical measurement that determines how the mattress sits in or on your bed frame. Shallower options suit divan bases with sides, while deeper mattresses often look best on platform or wooden frames where the sides are lower. Check the maximum mattress depth stated by the bed maker; exceeding it can raise the sleeping surface too high for safe access or make fitted sheets difficult to secure.
How Mattress Depth Influences Comfort and Support
Deeper mattresses usually incorporate multiple layers such as pocket springs, memory foam or latex, creating a luxurious, contouring feel. However, extra depth does not automatically mean better support; firmer constructions in deeper profiles can still suit those needing orthopaedic levels of firmness.
Practical rule: if you weigh over 95kg or share the bed with a partner of different weights, opt for a deeper pocket-sprung or hybrid design that maintains edge support. Shallower foam-only options may compress more noticeably over time. Always test by sitting on the edge; if it rolls, the depth may not suit heavy use.
Checklist for Choosing Depth
- Measure your bed frame’s internal side height and add at least 5cm clearance for sheet tucking.
- Confirm the frame manufacturer’s maximum recommended mattress depth.
- Consider duvet size: a standard king duvet (225x220cm) may look skimpy on a super king mattress; consider upgrading to a larger size.
- Factor in bedroom height: deeper mattresses raise the overall bed height compared with shallower ones.
- Test in store if possible: lie on both depths in the size you need.
King Size vs Super King: Space, Cost and Practical Trade-offs
A king size mattress offers ample room for two adults but limited space for children or pets to join. The super king provides an extra 30cm width, roughly the width of a small single (75x190cm), making it noticeably more generous. However, the larger footprint requires a bigger bedroom; allow at least 60cm clearance on each side for bedside tables and movement.
Cost scales with size and depth. Storage is another factor; deeper mattresses are heavier and harder to rotate alone. If your room is under 4m x 4m, a king size is often the more practical choice.
| Feature | King Size (150x200cm) | Super King (180x200cm) |
|---|---|---|
| Width difference | Standard for couples | +30cm extra space |
| Typical depth range | 20-35cm | 20-35cm |
| Duvet compatibility | Standard king duvet fits well | May need super king or oversized duvet |
| Bedroom space needed | Minimum 3.5m x 3.5m | Minimum 4m x 4m recommended |
| Frame options | Wide choice including king size ottoman beds | Fewer frames but good selection of super king ottoman beds |
Matching Mattress Depth to Bed Frames and Bases
Divan bases with deep sides usually pair best with shallower mattresses so the top sits level with or slightly above the edge. Wooden or metal bed frames with lower sides can accommodate deeper mattresses for a luxurious floating appearance. Always verify the frame’s stated maximum depth.
If upgrading from a shallower to a deeper mattress on an existing frame, check that the headboard height remains proportionate. For adjustable or storage beds, deeper mattresses add weight that may affect the lifting mechanism.
Recommended Depths for Luxury Feel and Specific Needs
For a plush, hotel-style luxury feel, choose deeper options in either size. These often feature multiple foam layers or pillow tops that create a sinking yet supportive sensation. Medium-firm options in this depth range suit most sleepers; firmer versions are better for back or joint support.
Couples who experience motion transfer may prefer deeper pocket-sprung constructions that isolate movement. Those wanting cooler sleep might look at hybrid or natural options with breathable covers. Check the exact specifications on each product page, as depth and layer composition vary.
Recommended products for this comparison:
The Maxitex Diamond Dual Season 1000 Pocket Memory Mattress offers generous depth in both king and super king sizes, making it ideal for those seeking balanced comfort and temperature regulation across seasons.
The Maxitex Dream 1000 Pocket Memory Mattress provides a deeper profile that enhances the luxury sink-in feel while maintaining strong edge support, suiting king or super king frames.
The Noomi Bamboo Natural Latex Pocket Sprung Mattress delivers natural materials in a deeper construction, offering excellent breathability and contouring that works particularly well in super king for maximum space and comfort.
The SleepShaper Supreme Comfort 700 Memory Foam Mattress gives a sumptuous deeper feel at a competitive price point, suitable for king size buyers wanting memory foam luxury without excessive height.
Buying Checklist and Final Decision Rules
- Measure your bedroom and existing frame precisely, noting current mattress depth.
- Decide priority: space (choose super king) or practicality and cost (choose king).
- Select depth based on frame compatibility and desired luxury level; deeper for plush feel, shallower for easier handling.
- Match duvet size to the new mattress depth and width.
- View ranges: browse king size mattresses or super king mattresses and filter by depth and firmness.
- Consider complementary bases from super king size beds or king size beds if replacing the full set.
Rule of thumb: if your room fits a super king and you value uninterrupted sleep space, invest in the larger size with at least 25cm depth. For smaller rooms or tighter budgets, a well-chosen king with appropriate depth usually delivers equal comfort per pound spent. Always read the full specification on the product page for exact depth, weight and materials before purchase.
Additional practical considerations include rotating or flipping the mattress; deeper double-sided models are heavier, so factor in ease of maintenance. For families, the extra width of a super king can accommodate occasional co-sleeping. If you currently use standard double bedding, upgrading to either size will require new sheets and duvets sized accordingly.
Many customers find that moving from a shallower to a deeper depth changes the whole sleep experience, giving a more cocooned and luxurious feel, but this only works if the bed frame can accommodate the extra height without looking disproportionate. Wooden bed frames with low footboards often showcase deeper mattresses best, while metal frames may need taller headboards to balance the visual height.
Our picks for this guide
- Maxitex Diamond Dual Season 1000 Pocket Memory Mattress – Offers generous depth suitable for both king and super king sizes, delivering balanced comfort and seasonal temperature control that matches the luxury feel discussed.
- Maxitex Dream 1000 Pocket Memory Mattress – Provides deeper profile with strong edge support, enhancing the plush hotel-style sensation especially noticeable when comparing king size vs super king options.
- Noomi Bamboo Natural Latex Pocket Sprung Mattress – Natural deeper construction offers breathability and contouring that performs particularly well in the wider super king size for couples seeking luxury and space.
- SleepShaper Supreme Comfort 700 Memory Foam Mattress – Delivers sumptuous deeper memory foam comfort at a competitive price, ideal for king size buyers wanting extra plushness without compromising on frame compatibility.
Frequently asked questions
Will a deeper mattress fit my existing king size bed frame?
It depends on the frame’s stated maximum mattress depth. Measure the side height and add at least 5cm for bedding. Many wooden and metal frames accept up to 30cm, but divans with high sides often suit shallower depths. Always check the product page for exact frame specifications.
Do I need a larger duvet for a super king mattress with extra depth?
Yes, a standard king duvet (225x220cm) may not drape properly over a deeper super king. Opt for a super king duvet or an oversized option from the duvets range to ensure full coverage and a neat finish.
Is a super king mattress worth the extra cost over a king?
If your bedroom is large enough and you value extra width for undisturbed sleep, the 30cm additional width justifies the price increase. In smaller rooms the king size usually provides better value and easier access.
How does mattress depth affect sheet fitting?
Deeper mattresses require deeper fitted sheets. Standard sheets are designed for shallower depths; for deeper options you will need extra-deep sheets. Measure your chosen mattress depth before buying bedding to avoid constant tugging.
Can children sleep on a king or super king mattress?
Yes, both sizes are suitable for older children, though a super king offers more room for siblings sharing. For younger children use appropriate guard rails if needed. Always choose a mattress that meets UK fire safety standards.
Related guides
- Super King Mattress vs Emperor Mattress: Luxury Size Guide
- Superking vs King Size Mattress: Is the Extra Width Worth It?
- Room Size Guide for Super King Beds
- Single vs Small Double Mattress: Which Size Should You Choose?
- Euro Double vs UK Double Mattress: Size and Fit Guide
- Double vs King Size Bed: Which Size Is Right for You?