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Double bed mattress measurements are simpler than most guides make them sound: a standard UK double mattress is 135cm wide x 190cm long (4'6" x 6'3"). That single measurement decides which bedding fits, whether a double will suit two adults comfortably, and how much floor space you'll need to leave around it. This guide covers the exact dimensions, how they compare to every other UK bed size, the difference between mattress size and bed frame size, and how to measure your own mattress in under a minute.

Double bed mattress measurements in cm, inches and feet

Here's the double mattress size broken down in every unit you'll need when you're ordering bedding, checking a bed frame's inner dimensions, or measuring up a bedroom:

Worth knowing before you buy: a small number of retailers (and most European brands, including IKEA) sell a "double" at 140cm x 200cm rather than the UK-standard 135cm x 190cm. Always check the exact dimensions on the product listing rather than relying on the size name alone, particularly if you're buying a mattress and a bed frame from two different retailers.

How a double compares to every other UK bed size

Seeing the double alongside the full range makes it much easier to decide whether it's actually the right size for your bedroom, or whether stepping up to a small double, king, or super king would serve you better.

The detail that catches most people out: a double only gives each person 67.5cm of sleeping width, which is roughly the same space as a cot. If you're buying for two adults and your room can take the extra 15cm of width, a king size is worth comparing before you commit.

Double bed frame size vs double mattress size

The mattress measurements above are fixed by industry standard, but the bed frame that holds it is a different story. In the UK, bed frames are named after the mattress size they're built to take, not their own outer dimensions. A double bed frame's inner sleeping area matches the 135cm x 190cm mattress, but the outer footprint of the frame itself is almost always larger, once you account for:

• Side rails and the frame structure, typically adding 5-10cm to the overall width
• A headboard, which can add anywhere from a few centimetres to 20cm+ of depth to the room, depending on the style
• Footboards or end panels, common on upholstered and panel bed designs

A useful rule of thumb: when you're planning a room layout, allow for a double bed frame footprint of around 145-150cm wide by 200-210cm long, rather than the 135cm x 190cm mattress size alone. This is exactly why every double bed frame we build lists its full outer dimensions on the product page, not just the mattress size it takes, so you can measure your room against real numbers before you order.

How to measure a double mattress yourself

If you're checking an existing mattress, replacing bedding, or verifying a size before you buy a new frame, measuring only takes a few minutes:

1. Strip the bed. Remove any fitted sheets, toppers or protectors first, as these add a small amount of extra give to the numbers.
2. Measure the width. Run a tape measure straight across the top of the mattress, from one long edge to the other.
3. Measure the length. Measure from the head end to the foot end in a straight line.
4. Measure the depth. Measure vertically from the base of the mattress to the highest point of the top surface.
5. Round to the nearest standard size. A slight variation of 1-2cm is normal across manufacturers and doesn't necessarily mean you have a non-standard mattress.

How much bedroom space does a double bed need?

Beyond the mattress footprint itself, allow clearance on at least two sides of the bed so you can make it comfortably and walk around freely; 60-70cm on each accessible side is a comfortable minimum. In practice, this means:

• A double bed frame fits comfortably in bedrooms from roughly 2.7m x 3m upwards
• Rooms under 2.7m wide can feel tight once you add a wardrobe or bedside tables
• If floor space is limited but you still want a double, an ottoman storage bed keeps the same mattress footprint while reclaiming the space underneath for bedding and out-of-season clothes

Who should choose a double bed?

A double works well for a single adult who wants more room to stretch out than a single provides, for guest rooms and second bedrooms, and for couples in an average-sized room who don't mind sleeping close together. If you and your partner are both taller than around 5'11", or if you tend to move around a lot in your sleep, it's worth trying a king size or super king before you buy, since the extra 15cm of width and 10cm of length make a noticeable difference night to night.

Frequently asked questions

What are the exact measurements of a UK double bed mattress?

A standard UK double mattress measures 135cm wide by 190cm long, which converts to 4ft 6in by 6ft 3in, or 53in by 75in.

Is a double bed big enough for two adults?

Yes, a double comfortably sleeps two adults, though each person only gets around 67.5cm of width, which is less generous than a king or super king. It suits couples in average-sized rooms, but taller or restless sleepers often prefer the extra space of a king size.

What size sheets fit a double bed?

Standard double fitted sheets are cut for a 135cm x 190cm mattress. If your mattress is deeper than 30cm, look for "extra deep" fitted sheets to make sure the corners stay in place.

Is a double bed the same as a full-size bed?

They're very close but not identical. A US "full" size mattress measures 137cm x 191cm (54in x 75in), which is marginally wider than the UK double at 135cm x 190cm. The difference is small enough that UK double bedding will still generally fit a US full-size mattress.

How much bigger is a king size than a double?

A king size mattress is 15cm wider and 10cm longer than a double, measuring 150cm x 200cm compared to the double's 135cm x 190cm.

Do double bed frames come in the exact mattress size?

The sleeping area of a double bed frame is built to the 135cm x 190cm mattress standard, but the frame's outer footprint is larger once you include the side rails, headboard and any footboard, so always check the listed outer dimensions before measuring your room.

Looking for a double bed frame built to these exact dimensions? Our handcrafted Milano Panel Bed Frame and Sunshine Border Bed Frame are both available in double, with full outer dimensions listed on each product page, or browse the complete range of double bed frames at Bed Innovation.