How Nia decides

Nia only changes the answer when the country or the number of sleepers changes the size name. Sleeping hot adds a question to ask the seller. It does not change the size.

Measurements

• United Kingdom figures come from Which?’s bed-size guide, read on 29 October 2026. A UK king is 150 × 200 cm. A UK queen is the small double, 120 × 190 cm.
• United States and Australia figures are the centimetres that appear on two seller charts (KAS Australia and Ecosa), also read that day. They are not a law. The product page wins if it disagrees.

What Nia will not do

• Name a best mattress, a best brand, or a firmness for back pain.
• Show a crossed-out price, a countdown, or a fee.
• Treat a commission as a reason to prefer one size. There is no ranked list to reorder.

bed.chat is a different site with a different question. This site does not link to it and does not reuse its pages.