An ottoman bed stores roughly the contents of a double wardrobe base, and the figure is set almost entirely by the mattress size above it. Working from standard UK bed dimensions and a typical internal base depth of 25cm to 30cm, a double ottoman offers somewhere in the region of 300 to 400 litres of usable volume, and a king size between 350 and 470 litres.
Those ranges are calculated from standard bed sizes and common base depths, not measured across a catalogue. We say that plainly because capacity claims in this category are frequently presented as though they were tested, and they are almost always arithmetic. What follows explains the arithmetic, the deductions that reduce it, and what the space is genuinely good for.
The internal storage area of an ottoman bed is close to the mattress footprint, reduced by the thickness of the side rails. A typical frame consumes 5cm to 8cm on each side, so a double base with an external mattress area of 135cm x 190cm offers an internal area in the region of 122cm x 177cm.
Depth is where the variation lies. Most ottoman bases run between 25cm and 30cm of internal depth beneath the sprung slats or platform. Multiply the internal area by that depth and the result is the theoretical volume: for the double described above, roughly 540 to 650 litres before deductions.
The deductions are significant. The gas strut mechanism, the cross bracing and the sloping fall of the mattress platform all take space, and no one can pack a storage void to its geometric limit. A realistic usable figure is around 60 to 70 per cent of the theoretical volume, which brings the double back to the 300 to 400 litre range given above. Expressed differently, that is roughly four to six large suitcases, or a complete set of winter bedding for two beds with room to spare.
The table below applies the same calculation across standard UK bed sizes. It is derived from published standard mattress dimensions and common internal base depths, and should be read as an estimate of order of magnitude rather than a measured result for any particular model.
| UK bed size | Mattress dimensions | Approximate internal area | Realistic usable volume at 25cm to 30cm depth | What that holds |
|---|---|---|---|---|
| Single | 90cm x 190cm | 77cm x 177cm | Around 200 to 270 litres | Spare bedding for one bed, off season clothing |
| Small double | 120cm x 190cm | 107cm x 177cm | Around 280 to 370 litres | Duvets, pillows, two medium suitcases |
| Double | 135cm x 190cm | 122cm x 177cm | Around 300 to 400 litres | Full winter bedding set plus suitcases |
| King | 150cm x 200cm | 137cm x 187cm | Around 350 to 470 litres | Bedding, luggage and bulky seasonal items |
| Super king | 180cm x 200cm | 167cm x 187cm | Around 430 to 570 litres | Equivalent to a small box room’s worth of soft storage |
Two things follow from the table. The first is that the jump from double to king delivers a meaningful capacity gain for 15cm of extra room width, which is often the better trade in a bedroom that can take it. The second is that ottoman storage is volumetric rather than organised: it is one large void, not a set of compartments, so what it holds well is bulk.
The lifting direction changes both the capacity and the room layout, and it is the decision people most often get wrong.
End lifting bases pivot at the head of the bed and rise from the foot. They generally offer the larger unobstructed void, because the strut housings sit along the sides where the frame is already thick. They require clear floor at the foot of the bed, typically 60cm to 80cm, so somebody can stand there and lift.
Side lifting bases pivot along one long edge. They suit rooms where the bed sits with its foot close to a wall or a wardrobe, which is common in smaller bedrooms. The penalty is internal: the mechanism intrudes along the length, and the void is usually shallower at the hinge side.
Both types need vertical clearance for the platform to swing. On an end lifting double, the raised platform describes an arc that can reach 90cm to 110cm above the bed height, so a sloping ceiling, a low window or a shelf above the bed will stop it opening fully. This is the single most common reason an ottoman bed disappoints after delivery, and it takes thirty seconds to check with a tape measure. Anyone comparing ottomans UK should measure that arc before comparing anything else.
Storage under a mattress is deep, dark and requires the bed to be cleared before it is accessed. That immediately defines the right contents: things needed a few times a year, not a few times a week.
Spare duvets and pillows are the natural fit, because they are bulky, light and rarely needed. Seasonal clothing works well, particularly coats and knitwear, provided they are clean before storage. Suitcases stack efficiently, and storing them empty inside the bed rather than full is usually the better use of the volume, because a case inside a case wastes nothing.
What does not work is anything that needs air, anything valuable that needs regular checking, and anything heavy. Bedding stored damp will not dry inside an enclosed base, so items should be fully aired before they go in. Heavy boxes make the platform harder to lift and put load on the struts, which are rated for the mattress rather than for the contents.
A practical habit is to bag soft items in breathable covers rather than sealed plastic, which allows some air movement while keeping dust off. Households that run out of ottoman capacity usually need a second type of storage rather than a bigger bed, and a blanket box UK at the foot of the bed handles the frequently accessed layer that an ottoman handles badly.
The gas struts are sized for a particular mattress weight range, and this is worth attention. A heavy pocket sprung mattress on a base specified for a lighter one makes the platform hard to raise and, more importantly, hard to lower under control. Conversely, a very light mattress on strong struts can cause the base to rise faster than expected.
Struts are consumable parts. They weaken gradually over years of use, and on a well made bed they can be replaced without replacing the frame. Asking whether replacement struts are available is a more useful question than asking how many kilograms the base supports.
Frame construction matters for the same reason. An ottoman base carries its load through the perimeter rather than through central legs on many designs, so the corners take the strain. Beds with a central support leg under the platform generally hold their geometry better over time, particularly in larger sizes. Those looking across fabric beds UK will find strut ratings and support leg details stated in the specifications, and they are worth comparing directly.
Check three clearances before buying: the arc above the bed, the floor space in the lifting direction, and the route into the bedroom. Ottoman bases are usually delivered in sections, but the assembled platform is a single large panel and the frame components are long.
Choose the lifting direction from the room plan rather than from preference. If the foot of the bed faces a wardrobe within a metre, an end lifting base cannot be used comfortably, and a side lifting one is the correct answer even though it stores slightly less.
Finally, be realistic about what this storage replaces. An ottoman bed is a good substitute for a loft or a spare cupboard for soft, bulky, occasional items. It is a poor substitute for a chest of drawers, because everything in it is under the mattress and nothing in it is sorted. The households that get the most from these beds treat the void as long term storage and keep daily items in bedside cabinets UK and drawers where they can be reached without lifting anything.
This report was compiled in 2026 by the editorial team at Furniture in Fashion, a UK furniture retailer. The capacity figures are calculated from standard UK mattress dimensions and the internal base depths common to ottoman frames, with a realistic packing allowance applied, and they are presented as calculated ranges rather than measurements taken from any set of models. Despite the reference in the title, we have not published averages, counts or rankings drawn from a sample of products, because such figures could not be attributed to a verifiable public source. The report also draws on our editorial assessment of how these beds are used in British bedrooms and on published UK housing context where a named public source genuinely applies, such as the English Housing Survey. It contains no proprietary sales data, no customer data and no survey fieldwork.
Media and websites are welcome to cite this 2026 analysis with credit to Furniture in Fashion and a link back to our site. Please describe the capacity figures as calculated ranges derived from standard bed dimensions and typical base depths, since they are not measured product test results. We are happy to set out the calculation in full on request.
Roughly 300 to 400 litres of usable space once the frame and mechanism are deducted, which is comparable to four to six large suitcases or a complete set of spare winter bedding.
End lifting usually offers more unobstructed storage, but it needs clear floor at the foot of the bed. Side lifting suits rooms where the bed foot sits close to a wall or wardrobe.
An end lifting double platform can swing 90cm to 110cm above the bed. Sloping ceilings, low windows or shelves above the bed will prevent it opening fully.
Yes, provided they are clean and fully dry, and stored in breathable covers rather than sealed plastic. It suits seasonal clothing rather than anything worn regularly.
They weaken over time with use. On well made beds they can be replaced individually, so it is worth checking availability of replacement struts before buying.
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