UK mattress size guide

UK mattress dimensions at a glance

These dimensions are the sizes most UK retailers use. Less common options include Small Single (often 75 × 190cm), zip-and-link beds and made-to-measure products. Do not assume a familiar name guarantees a dimension. The National Bed Federation notes that bed dimensions can vary, so the stated measurements and the manufacturer’s instructions take precedence.

Browse the currently available Single, Small Double, Double, King and Super King catalogue pages once you know the right dimensions.

How much sleeping space do you actually get?

A Double sounds generous until its width is divided between two people. Each person gets 67.5cm—less than the width of a Single. A King gives 75cm each and a Super King gives 90cm each, equivalent to a Single per person. More width can reduce disturbance when one person turns over, but mattress construction and motion isolation matter too.

UK, European and US names are not interchangeable

European sizes are commonly 200cm long and often use different widths: for example, 140 × 200cm and 160 × 200cm. US Queen and King sizes differ again. Marketplace listings can use ‘queen’, ‘full’ or ‘king’ without making the sizing system obvious. A near-match can leave a mattress compressed, unsupported or moving inside the frame.

• Read the centimetre dimensions in the specification, not only the title.
• Check whether the frame, mattress and fitted sheets all use the same sizing system.
• Ask the seller to confirm dimensions if a listing mixes UK and international names.
• For zip-and-link or adjustable beds, confirm the size of each half and the combined size.

Measure the room, frame and route

1. 1

   Measure the frame internally

   Take width and length where the mattress sits. Measure at several points if the frame is old or handmade.

2. 2

   Check mattress depth

   A deep mattress changes bed height, fitted-sheet depth and how much side rail or headboard remains visible.

3. 3

   Map the delivery route

   Measure doors, stair width, ceiling height, turns and landings. A boxed mattress can still be heavy and long.

4. 4

   Allow usable room space

   Mark the bed footprint on the floor and check wardrobes, drawers, sockets and walking space.

5. 5

   Confirm base compatibility

   Check the maker’s instructions for base type, support and slats before ordering.

6. 6

   Plan bedding

   Budget for the correct protector and fitted-sheet depth, especially when changing size.

When upgrading from Double to King, both dimensions change: width rises by 15cm and length by 10cm. Include the frame’s outer dimensions, which can be much larger than the mattress footprint. Drawers and ottoman mechanisms also need clearance.

Common size mistakes and a final decision

• Assuming ‘double’ means the same thing on every international listing.
• Measuring the existing mattress after it has bowed or spread instead of measuring the frame.
• Ignoring the final stair turn because the front door is wide enough.
• Choosing the largest size that physically fits but leaves no comfortable route around the bed.
• Forgetting that a larger size changes bedding, base and removal costs as well as mattress price.