Mattress Size Converter
Compare mattress sizes between US, UK, EU, and Australian standards.
Shows exact width and length in both inches and centimeters for all common mattress types.
Select a mattress size from any region to see its dimensions and closest equivalents.
Mattress sizes vary significantly between the US, UK, and EU. A “Queen” in the US is not the same as a “King” in the UK, even though they are similar sizes.
US mattress sizes:
| Name | Width x Length (inches) | Width x Length (cm) |
|---|---|---|
| Crib | 28 x 52 | 71 x 132 |
| Twin | 38 x 75 | 97 x 190 |
| Twin XL | 38 x 80 | 97 x 203 |
| Full/Double | 54 x 75 | 137 x 190 |
| Queen | 60 x 80 | 152 x 203 |
| King | 76 x 80 | 193 x 203 |
| California King | 72 x 84 | 183 x 213 |
UK mattress sizes:
| Name | Width x Length (inches) | Width x Length (cm) |
|---|---|---|
| Small Single | 30 x 75 | 76 x 190 |
| Single | 36 x 75 | 91 x 190 |
| Small Double | 48 x 75 | 122 x 190 |
| Double | 54 x 75 | 137 x 190 |
| King | 60 x 78 | 152 x 198 |
| Super King | 72 x 78 | 183 x 198 |
EU (IKEA/Continental) mattress sizes:
| Name | Width x Length (cm) | Width x Length (inches) |
|---|---|---|
| Single | 90 x 200 | 35 x 79 |
| Double | 140 x 200 | 55 x 79 |
| King | 160 x 200 | 63 x 79 |
| Super King | 180 x 200 | 71 x 79 |
Key differences between systems:
- EU mattresses are typically 200 cm (79 inches) long, which is slightly shorter than US mattresses at 203 cm (80 inches).
- A US Queen (60 x 80 in) is very close to a UK King (60 x 78 in) but 2 inches longer.
- A US King (76 x 80 in) is wider than a UK Super King (72 x 78 in) but the UK version is shorter.
- EU sizes use round centimeter numbers (90, 140, 160, 180 cm widths), making them easy to remember.
Practical tips when shopping across regions:
- Sheets and bedding are sized to match each region’s standards, so always check dimensions rather than relying on size names.
- If you buy a mattress from a different region, you may need custom-sized sheets.
- Always measure your bed frame before ordering a mattress from another country.
- IKEA uses EU sizing worldwide, even in their US and UK stores, so their mattresses may differ slightly from local standards.
How we build and check this converter
This converter runs entirely in your browser, so the numbers you enter stay on your device. The math behind it is written by hand and tested against worked examples and standard references before the page goes live.
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