UK Bed & Mattress Size Guide (Including Cot & Moses)

Buying bedding is much easier when the size names match what you already own. UK bed sizes use a shared set of names (single, double, king and so on), while Moses baskets, prams and cribs are usually sold by centimetre measurements. This guide keeps both in one place so you can measure once and shop with more confidence on The Comfort Shop.

Adult UK bed sizes (common names)

UK retailers usually label duvet covers, sheets and duvets with these bed names. Exact centimetre dimensions can vary slightly by brand and mattress maker, so treat the figures below as typical guides—not a guaranteed fit for every bed in the country.

When you order a fitted sheet, also check pocket depth (how deep the mattress is). A deep mattress, or a mattress plus a thick topper, may need a deeper sheet than a slim guest bed. If your current sheet strains at the corners, measure depth before you reorder.

Browse adult bedding by type: duvets, duvet covers, bed sheets and pillows.

Moses baskets, prams, carrycots and cribs

Nursery mattresses are rarely sold only as “cot size”. They are listed by length × width × depth in centimetres, because Moses baskets and crib bases differ a lot between models and brands.

How to measure

1. Empty the basket, pram, carrycot or crib base.
2. Measure the inside length and width where the mattress sits.
3. Note the depth if the product listing asks for it.
4. Match those numbers to the product title (for example 74 × 28 × 3.5 cm).

A mattress that is too small can leave gaps at the edges; one that is too large will not sit flat. If you are between sizes, re-measure rather than rounding up “just in case”.

We keep a large list of Moses and crib mattresses in Baby Mattresses for Moses Baskets and Cribs. For a quicker jump by centimetre size, use Find Your Mattress Size. Wider nursery bedding and kids duvet sets sit in Baby & Kids Bedding.

Sheets, protectors and toppers

Once the mattress size is right:

• Choose a fitted sheet that matches the bed name (or centimetre size for nursery).
• Add a mattress protector if you want a washable layer over the mattress.
• Add a mattress topper only after checking both the bed size and the topper thickness in centimetres.

See mattress toppers and mattress protectors. After adding a topper, confirm your fitted sheets still have enough depth.

Duvets and covers — keep the size family the same

A single duvet inside a double cover will slide around; a king duvet in a double cover will not sit neatly. Match the same UK size name across duvet, cover and sheet set whenever you can. If you are replacing only one piece, read the size label on the item you already own rather than guessing from the bed frame.

Quick checklist before you click Buy

• Adult bed: confirm the bed name on your current duvet cover or fitted sheet.
• Nursery: measure inside the base in centimetres.
• Fitted sheets: check pocket depth.
• Duvets and covers: match the same UK size name across the set.

If you are unsure, start with the measuring steps above, then open the matching collection. Getting the size right first saves returns and makes the rest of the bedding easier to choose.