There is no international mattress standard, which is why importing a bed or ordering sheets from another market so often ends badly. A King is 76 by 80 inches in the United States, 150 by 200 centimetres in the UK and 183 by 203 in Australia — three different beds sharing one name. This converter matches on measurements rather than names. Pick a size or type in what you measured, and it finds the nearest bed in each of the four main markets, showing exactly how many centimetres off it is in each direction. Anything within about three centimetres will take the same fitted sheet; anything further will not, whatever the label says.
Features
Sizes from the US and Canada, UK and Ireland, continental Europe and Australia
Matches by measurement, so the names cannot mislead you
Difference in width and length shown for every match, in centimetres
Flags matches close enough for bedding to fit
Identifies a bed from dimensions you measured yourself
Room-fit check with clearance on each side and at the foot
Inches and centimetres side by side throughout
How to use the Mattress Size Converter
Pick a mattress size, or switch to measuring and type the width and length
Read the closest equivalent in each of the other markets
Check the difference column before ordering bedding
Enter your room dimensions to see how much space is left around the bed
Example
Input
US Queen — 60 × 80 in
Output
UK King 150 × 200 cm (−2.4 cm wide, −3.2 cm long) · EU Queen 160 × 200 cm
A US Queen is closest to a UK King, but not close enough to share a fitted sheet.
Common errors & troubleshooting
Sheets bought abroad do not fit. — Check the difference column rather than the name. A UK King and a US Queen are close, but the three-centimetre gap in each direction is enough for a fitted sheet to pull off the corners.
A measured bed does not match anything exactly. — Mattresses vary by a centimetre or two between manufacturers, and older beds vary more. The closest match is shown with the difference, so you can judge whether it is close enough.
A UK Queen is not in the table. — Because it is not a standard UK size. Some UK retailers call a Small Double a Queen, which is 120 by 190 cm — nothing like a US Queen.
The room-fit check says the bed fits but it feels cramped. — Fitting is not the same as being usable. The comfortable verdict needs 60 cm on each side and at the foot, which is the width a person needs to walk past and make the bed.
Frequently asked questions
Is a UK King the same as a US King?
No, and the difference is large. A UK King is 150 by 200 cm while a US King is 193 by 203 cm — the US bed is over 40 cm wider, closer to a UK Super King with a bit to spare.
What are the dimensions of a Queen bed?
In the US and Canada, 60 by 80 inches, or 152 by 203 cm. In Australia a Queen is 153 by 203 cm, which is almost identical, while in Europe the nearest common size is 160 by 200 cm.
What is the difference between a King and a California King?
A California King is narrower and longer: 72 by 84 inches against the standard King's 76 by 80. It suits a tall sleeper or a long narrow room, and it needs its own sheets.
How much space should I leave around a bed?
About 60 cm on each side you need to walk down, and the same at the foot if there is a route past it. Less is workable in a small room but makes changing the sheets awkward.
Why are European mattresses 200 cm long?
Because continental sizing is built on round metric numbers rather than converted inches, so lengths are 190 or 200 cm and widths step in 20 cm increments. That is also why two 90 cm singles are so often pushed together to make a King.
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