The Ultimate UK Bed & Mattress Size Guide

Deyan Chernogorski | February 9, 2026

Selecting the perfect bed size is not easy. With feet to inches to centimetres, it can often feel like codes. But don’t worry, we’ve compiled it all into a simple, easy-to-understand guide so you can choose the right bed and mattress without the headache.

How UK Bed Sizes Work

The mattress that the bed is designed to accommodate determines its size. In other words, the mattress size you select will dictate the frame size you require. Many bed sizes in the UK are named after the width of the mattress (in feet) but also have a metric equivalent (in centimetre’s).

Bed Type	Width × Length (Feet)	Width × Length (cm)
Single Bed	3'0" × 6'3"	90 × 190
Small Double Bed	4'0" × 6'3"	120 × 190
Double Bed	4'6" × 6'3"	135 × 190
King Size Bed	5'0" × 6'6"	150 × 200
Super King Size Bed	6'0" × 6'6"	180 × 200

Note: Bed frames are usually a bit larger than the mattress itself, especially if they have headboards, footboards or storage units. So always check UK bed sizes dimensions before buying.

Which Bed Size Should You Choose?

Small bedrooms / kids’ rooms: A Single or Small Double is perfect as lots of room left for wardrobes, desks and movement.

Couples sharing a bedroom: A Double bed is a classic choice and is comfy. If you want more stretch, a King is a great upgrade.

Tall sleepers or luxury feel: The King and Super King sizes provide extra leg space and maximum comfort.

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Frequently Asked Questions

How can I stop my wooden bed from squeaking when I move?

Tighten All Screws and Bolts in the Bed Frame to Stop Your Wooden Bed from Squeaking. Lubricate Joints: Apply silicone wax or paraffin with little friction for noise reduction. If the problem continues, perhaps your bed slats have become worn and might need replacing or it could be time for the mattress turning to reduce pressure on springs.

Why does my wooden bed creek when I lay on it and how do check where it is coming?

The wooden bed you have may begin to creak when screws are loose, or the joints start rubbing against each other with time (or slats becoming too old and need replacement). Remove the mattress to test the noise on the floor. Pull the bed away from the wall to access all areas of the frame, or potentially even dismantle one side (or lift a corner) so you can get inside and work that noisy bit.

What should I do if tightening the screws doesn’t stop my wooden bed from creaking?

If the creak has not stopped by tightening up screws then wax all the joints using specialised wood squeak sealing was, paraffin or candle wax to alleviate any friction. Also, get the wooden slats of a platform bed checked or replaced if needed and verify that your big boy/girl is exerting even pressure on joints by keeping the base level.

Can an uneven floor cause my wooden bed frame to squeak?

One of three potential causes of a squeaky bed frame is an uneven floor resulting in excess pressure applied against the joints on your wood bed. You can have the bed adjusted or just place floor padding under its legs for stability and noise.

When should I consider replacing my mattress if my bed is squeaking?

If the squeaking continues after fixing your bed frame, you may consider getting a new mattress (if it is also quite old one with noisy inner springs). In theory, spreading out weight over a larger area should alleviate the problem - but in practice rotating your mattress is just going to ease that pressure for a brief moment or two. If you need one solution to this noisy issue, consider getting yourself a foam mattress without any springs inside; these take quite some time before wearing off!