Small Double vs Double Bed: What's the Size Difference?

A UK Small Double bed measures 120 x 190 cm (about 47 x 75 inches) and a UK Double measures 135 x 190 cm (about 53 x 75 inches). The Double is 15 cm wider and the same length.

Small Double and Double are the two UK bed sizes people confuse most often, and the naming doesn't help — "Small Double" sounds like it should sit clearly below "Double", but the actual width gap between them is bigger than the names suggest.

Small Double vs Double: Sizes at a Glance

• Small Double (4ft): 120 x 190 cm, about 47 x 75 inches
• Double (4ft 6): 135 x 190 cm, about 53 x 75 inches
• King: 150 x 200 cm, about 59 x 79 inches
• Difference between a Small Double and a Double: 15 cm wider, same length

The Actual Size Difference

So what size is a small double bed? A Small Double measures 120 x 190cm — a small double bed width of 120cm and a small double bed length of 190cm — while a Double measures 135 x 190cm. The size of a small double is the same length as a Double, but 15cm narrower. That 15cm matters more in practice than it sounds: it's the difference between a bed genuinely built for one adult with room to stretch out, and one that can technically fit two adults but with meaningfully less width per person than a true Double or King.

Browse our small double beds or double beds, or see every UK size in our bed size guide.

Who Small Double Suits

A Small Double works well as a single-occupant bed with more room than a standard Single, in a bedroom that can't comfortably fit a full Double. It's a common choice for:

• A guest room where the bed occasionally needs to sleep two but is mainly used by one person
• A teenager's room that's outgrown a Single but doesn't have the floor space for a Double
• A smaller main bedroom where a Double would leave uncomfortably little walking space around the bed

Who Double Suits

A Double is the more practical minimum for two adults sharing a bed long-term. It's tight for two by modern standards (a King at 150cm width is now the more common choice for couples), but it comfortably suits a single sleeper who wants noticeably more space than a Small Double provides, or a couple in a smaller bedroom where a King genuinely won't fit.

Is a Small Double Big Enough for Two People?

It's designed primarily for one — at 120cm wide it's tight for two adults on a long-term basis, though it can work for occasional or short-term shared use. If two people will be sharing the bed every night, a Double (or ideally a King) will serve you better long-term.

Making the Decision

Choose a Small Double when the bed is mainly for one person and room size is genuinely tight; choose a Double when you want meaningfully more width, whether for one person's comfort or as the practical minimum for two people sharing a smaller bedroom.