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Which mattress fits the way you sleep?

Nine quick questions. Bed Fit tells you the type, the firmness range and the size for your country, and what to check before you pay.

Bed Fit, a small upright mattress with a pillow on its head

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  • No brand pays to be ranked. We have no shop partnerships today.
  • Every reason shows its evidence, from strong to "industry says so".
  • Sizes in centimetres for six countries, because a King is not always a King.

Question 1 of 9

Where will you buy it?

Size names, what you can buy and your return rights all change by country.

What this changes Sizes, the checklist and return rights.

How do you usually fall asleep?

Pick the position you spend most of the night in. "I move around" is a fine answer.

What this changes Rule 4: side sleepers need shoulders and hips to sink in; back sleepers need the lower back held up.

Roughly what do you weigh?

A band is enough. It changes how much support you need, more than height does.

What this changes Rule 3: heavier bodies tend to need firmer support, lighter bodies softer.

Does anything ache in bed or when you get up?

Choose all that apply. Bed Fit gives buying guidance only; it does not diagnose.

What this changes Rules 1 and 2: with long-standing low back pain, medium-firm did better than the firmest.

Do you sleep hot?

Waking up warm, kicking the covers off, a warm bedroom.

What this changes Rule 5: cooler builds may feel cooler, but the evidence on sleep itself is weak.

Who shares the bed?

If one of you wakes when the other turns over, say so here.

What this changes Rule 6: low motion transfer, a bigger bed, or two singles.

What can you spend on the mattress?

For the mattress alone. A ballpark is fine; Bed Fit will say what each band usually gets you.

What this changes Which types are realistic, and the no-commission option in each band.

What size, and what will it sit on?

Pick a size name for your country if you know it, then the base. Not sure is fine for both.

Size

What this changes Size for your country in cm and inches, and whether your frame keeps the warranty valid.

Is any of this true?

Choose all that apply.

What this changes Rules 7 and 8: allergen covers for children; bed height and support for getting up.

Your answers

Tap any answer to change it. Bed Fit only sees what is listed here.

The chooser needs JavaScript to hand your answers to Bed Fit. The checklist and size tool work without it.

No brand pays to be ranked. We have no shop partnerships today.

Bed Fit’s answer

Your chooser answers land here. Keep asking: change one answer, compare two types, check a size.

Bed Fit AI chooser · no brand pays to be ranked

Bed Fit gives general buying guidance, not medical advice. It can be wrong; check the shop's own terms before you buy. How Bed Fit decides

How Bed Fit decides

The order comes from your answers and a short set of rules drawn from sleep and back-pain research, never from what a brand pays. Each rule carries its evidence level, so you can see how sure we are.

See all eleven rules

  1. Long-standing lower back pain

    Lean medium-firm. Not the firmest you can find.

    Moderate

  2. Sharing with a light sleeper

    Pick a build that passes on little movement (memory foam, pocket springs), a bigger bed, or two singles.

    Moderate

  3. Sleeping hot

    Breathable or heat-conducting builds can feel cooler, but a 2025 review of trials found no clear effect on sleep itself.

    Weak

Same name, different bed

A UK King is about the size of a US Queen, and a US King is wider than both. The drawing shows all three to scale, using the figures in our size tool.

Open the size tool
UK King 150 × 200 cmUS Queen 60 × 80 inUS King 76 × 80 in

Read before you buy

Latest guides

  1. Frames and basesAdjustable Beds: What to Know Before You BuyAdjustable beds let you change the mattress position from top to bottom, but they need special mattresses and tend to be wider than standard beds.
  2. Frames and basesBed Slats and Frames: Spacing, Centre Support and Your WarrantyWhich? says a weakened bed frame or broken slats can make a mattress sag, leading to poor support.
  3. KidsBunk Bed Safety: Guardrails, Ages and the Rules in the US, UK and AustraliaThe US federal bunk bed rule includes the warning: do not allow children under 6 years of age to use the upper bunk.
  4. By sleeperCooling Mattress for Hot Sleepers: What Helps and What the Evidence SaysBeing too hot at night can disturb sleep, making you toss and turn and wake up tired, according to CHOICE.
  5. Buying, trials and returnsHow Often Should You Replace a Mattress? Signs and EvidenceWhich? says it would expect any type of mattress to last between eight and 10 years.
  6. How to chooseHow to Choose a Mattress: A Step-by-Step GuideTo choose a mattress, start with how you sleep and your body, then work through type, firmness, size, base, trial and price.

The first guides are being written and checked. Until then, Bed Fit can answer the same questions. Ask Bed Fit