Size charts
Mattress Size Chart in CM and Inches
Quick answer
Standard US mattress sizes converted to centimeters (width by length): Twin 97 x 191 cm, Twin XL 97 x 203 cm, Full 137 x 191 cm, Queen 152 x 203 cm, King 193 x 203 cm, California King 183 x 213 cm. These centimeters are calculated from the standard inch dimensions at 1 in = 2.54 cm, rounded to the nearest whole centimeter, not separately published metric sizes. Specialty sizes like Olympic Queen (168 x 203 cm) and Alaskan King (274 x 274 cm) are real products but are not industry-standard and vary by maker.
There is no separate metric version of a US mattress size. A Queen is 60 by 80 inches everywhere in the US industry, and the centimeter figure is just that number run through the standard conversion, 1 inch equals 2.54 centimeters, then rounded to a whole centimeter. This chart does that math once so you do not have to, and keeps the non-standard specialty sizes in their own table so a converted number never gets mistaken for a published standard.
Standard US mattress sizes in inches and centimeters
| Size | Width (in) | Length (in) | Width (cm) | Length (cm) |
|---|---|---|---|---|
| Twin | 38 | 75 | 97 | 191 |
| Twin XL | 38 | 80 | 97 | 203 |
| Full (Double) | 54 | 75 | 137 | 191 |
| Full XL | 54 | 80 | 137 | 203 |
| Queen | 60 | 80 | 152 | 203 |
| King (Eastern King) | 76 | 80 | 193 | 203 |
| California King | 72 | 84 | 183 | 213 |
| Split King, each Twin XL half | 38 | 80 | 97 | 203 |
| Split California King, each half | 36 | 84 | 91 | 213 |
Calculated
These figures are calculated from the numbers shown, not quoted from a manufacturer.
Centimeters are the standard inch figure multiplied by 2.54 and rounded to the nearest whole centimeter. These are calculated conversions of the US industry-standard sizes, not a separately published metric dimension. See the sleeps-per-size and square footage figures on the mattress size chart.
Specialty sizes in centimeters (not industry-standard)
| Size | Width (in) | Length (in) | Width (cm) | Length (cm) |
|---|---|---|---|---|
| Olympic Queen | 66 | 80 | 168 | 203 |
| Short Queen (RV) | 60 | 75 | 152 | 191 |
| Wyoming King | 84 | 84 | 213 | 213 |
| Texas King | 80 | 98 | 203 | 249 |
| Alaskan King | 108 | 108 | 274 | 274 |
Convention, not a standard
This is widely repeated guidance rather than a measured standard. Treat it as a starting point.
These sizes are real products but no industry body sets their dimensions, so the inch figure itself varies by maker before it is even converted to centimeters. Confirm the exact listed dimensions before ordering anything sized to one of these.
A US size in centimeters is not the same as a metric market size
These centimeter numbers are the US industry-standard sizes run through a straight unit conversion, useful for comparing against a metric tape measure, a metric room dimension or an imported product's spec sheet. They are not the mattress sizes sold as standard in other countries, which are set independently by their own markets and do not line up exactly with a converted US Queen or King. If you are buying bedding manufactured for a different country's market, check that country's own published centimeter dimensions rather than assuming this conversion table applies to it.
Shop mattresses by size
Zinus Memory Foam 8 Inch Green Tea Mattress
$109.998 inch twin memory foam.
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Zinus 12 Inch Twin XL Green Tea Memory Foam Mattress
$198.6712 inch twin xl memory foam, medium firm feel as the maker describes it.
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Zinus Memory Foam 12 Inch Green Tea Mattress
$239.9912 inch full memory foam.
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EGOHOME Queen Mattress 12 Inch
$249.9912 inch queen memory foam, medium firm feel as the maker describes it.
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EGOHOME King Size Memory Foam Mattress 12 Inch
$299.9912 inch king memory foam, medium firm feel as the maker describes it.
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Novilla California King Mattress
$265.9912 inch california king memory foam.
Check price on AmazonFrequently asked questions
How many centimeters is a queen mattress?
A US Queen mattress is 60 by 80 inches, which converts to 152 by 203 centimeters using the standard 2.54 cm per inch conversion, rounded to the nearest whole centimeter. That centimeter figure is calculated from the standard inch dimension rather than being a separately published metric size, so it is exact for comparison purposes even though no US manufacturer lists the mattress in centimeters on the box.
Is a US queen the same size as a European queen?
Not necessarily. The 152 by 203 cm figure here is simply the US Queen converted to metric units, not the mattress size a European market calls a queen. Mattress sizes sold as standard in other countries are set independently and can differ by several centimeters from a converted US size. If you are matching bedding made for another country's market, check that market's own published centimeter dimensions rather than this conversion.
How do you convert mattress inches to centimeters?
Multiply each inch measurement by 2.54 and round to the nearest whole centimeter. A 60 by 80 inch Queen becomes 152.4 by 203.2 centimeters before rounding, which rounds to 152 by 203 centimeters. The same arithmetic applies to any mattress dimension, a topper thickness or a room measurement; the conversion factor does not change based on what is being measured.
What is a king mattress in centimeters?
A US King (Eastern King) mattress is 76 by 80 inches, which converts to 193 by 203 centimeters. California King is a different shape at 72 by 84 inches, converting to 183 by 213 centimeters: narrower but longer than a King, and the two sizes come out close in total area despite the different centimeter dimensions on each side.
Are Olympic Queen, Wyoming King and similar sizes standardized in centimeters?
No. Unlike the nine standard US sizes, specialty sizes such as Olympic Queen, Wyoming King, Texas King and Alaskan King are not set by any industry body, so the inch dimension itself can vary between manufacturers using the same name. Converting an unstandardized inch figure to centimeters does not make it standardized; always check the specific listing's stated dimensions before ordering.
What is a twin mattress in centimeters?
A standard Twin mattress is 38 by 75 inches, converting to 97 by 191 centimeters. Twin XL keeps the same 38 inch width but adds 5 inches of length, converting to 97 by 203 centimeters, the same width as a Twin but the same length as a Queen or King, which is why Twin XL sheets and Twin sheets are not interchangeable despite the shared width.
How to read the numbers on this page. Standard mattress and bedding dimensions are industry-wide and the same across manufacturers. Guidance like replacement intervals, firmness by body weight and walking clearance is convention rather than a measured standard, and every table here says which it is. Where a manufacturer does not publish a figure we leave it out instead of estimating. This is not medical advice: a mattress is not a treatment for a medical condition, and persistent pain is a reason to see a clinician.