Mattress Sizing Made Simple: Find the Right Bed for Your Space

Choosing a mattress isn’t just about picking a comfy feel – it’s also about getting the right dimensions. Too big and you’ll struggle to fit it through the door; too small and you’ll end up fighting for space at night. Let’s break down the basics so you can pick a size that fits your room, your body, and your budget.

UK Mattress Sizes You Need to Know

In the UK the standard sizes are straightforward. Here’s the quick reference:

• Single – 90 cm × 190 cm
• Double – 135 cm × 190 cm
• King – 150 cm × 200 cm
• Super King – 180 cm × 200 cm

If you have a narrow bedroom, a single or double works best. For couples who need extra room, the king or super king is the sweet spot. Measure your floor space first – leave at least 30 cm on each side for easy movement.

What Does XL Mean? Extra‑Long vs Deep‑Pocket

XL can be confusing because it appears on sheets, duvets, and mattress covers. In most cases XL means “extra‑long” – the length is longer than the standard 190 cm. For taller people, an XL mattress (typically 200 cm long) stops you from hanging off the edge.

Sometimes XL is used for “extra‑deep” pockets, which refer to the thickness of the mattress. A deep‑pocket sheet fits thicker mattresses (up to 30 cm), while standard sheets are made for mattresses under 20 cm. Check the product details: if your mattress is 25 cm high, you’ll need a deep‑pocket sheet even if the length is standard.

When you shop across borders, remember the US and NZ use different naming. A US Twin XL is 99 cm × 203 cm – a bit wider and definitely longer than a UK single. If you buy online from overseas, compare the exact measurements rather than relying on the name.

Measuring your mattress is easy. Lay a tape measure on the side for width, then stretch it from head to foot for length. Write those numbers down and match them with the sheet or duvet size chart. If the numbers don’t line up, you’ll end up with a shirt‑sleeve‑type fit that looks sloppy on the bed.

Now that you know the sizes, here are three quick tips to avoid common mistakes:

1. Always add a few centimetres to the width and length when ordering sheets – a little extra is better than a tight fit.
2. Check the mattress thickness before buying covers; deep‑pocket options aren’t much more expensive.
3. If you’re buying an adjustable bed, verify that the frame can handle the size you choose. Some models have a maximum width of 150 cm.

With the right measurements in hand, you can shop confidently, compare prices, and know exactly what will work in your bedroom. No more second‑guessing or having to return ill‑fitting bedding.

Ready to pick your perfect mattress size? Grab a tape measure, jot down the numbers, and match them with the chart above. You’ll sleep better, move around easier, and look great with sheets that actually fit.