Why do sizes differ between countries?
Mattress sizes didn't diverge only because of metric versus imperial. Each country's housing patterns, average heights, and long-standing bedding traditions shaped its own standard. The same label — "queen" — can describe mattresses 10 to 30 centimeters apart depending on where you buy. If you pick based on hotel experience abroad, international movers, or a direct import, the numbers often don't line up with what you expected.
Same Queen, different size — by country
Korea
Korea mostly follows the European 200 cm length but uses its own width system. Dimensions can vary by manufacturer by 1-5 cm, so always verify the exact width and length before buying. Note also that bed frame inner dimensions are different from the mattress outer dimensions — a mismatch is the most common cause of "it doesn't fit" or "it's loose in the frame."
United States
US sizes are in inches, with lengths usually 75" or 80" (roughly 190-203 cm). Twin and Full are noticeably short for taller adults — Twin XL or larger is safer for anyone above about 180 cm. If you import a US mattress into Korea or Europe, expect frame-fit issues: the width doesn't match local bed frames, and standard sheets won't either.
Europe
European mattresses are mostly 200 cm long, but standard widths vary by country. German-speaking and Nordic markets default to 90, 140, or 180 cm. The UK still uses feet-and-inches (4'6", 5', 6'). IKEA's size chart is a de-facto pan-European standard. Be careful: a "European King" (180 × 200) is not the same as a "US King" (193 × 203).
Japan
The defining feature of Japanese sizes is the length: 195 cm, roughly 5 cm shorter than Korea and Europe. Anyone around 180 cm tall may feel the foot-end crowd the mattress; look for "long" (ロング) variants or non-Japanese sizes. Japan's traditional futon-on-tatami culture also means many mattresses are designed for lower heights and more airflow through the base.
Cross-region size comparison
| Name | Width | Length | Notes |
|---|---|---|---|
| KR Super Single | 110 cm | 200 cm | students, single adult |
| KR Queen | 150 cm | 200 cm | most common in Korea |
| KR Large King | 180 cm | 200 cm | effective minimum for couples |
| US Queen | 152 cm | 203 cm | 3 cm longer than KR Queen |
| US King | 193 cm | 203 cm | 13 cm wider than KR Large King |
| EU King | 180 cm | 200 cm | not the same as US King |
| JP Queen | 160 cm | 195 cm | 5 cm shorter length |
| JP King | 180 cm | 195 cm | 5 cm shorter length |
How to pick the right size
Length: your height + at least 15 cm. If you're 180 cm tall, a 195 cm Japanese mattress will feel short.
Width for couples: each person needs shoulder width + about 15 cm of clearance — roughly 75 cm each, or 150 cm total (Queen) at minimum. Restless sleepers should consider 180 cm (Large King or EU/US equivalents).
Room dimensions: leave at least 60 cm of walking space on one side for cleaning and making the bed.
Delivery path: measure your front door, elevator, and hallway turns. King and above often get stuck at hallway corners.
Three common mistakes
Buying on name only. "Queen" is not the same in Korea (150 × 200), the US (152 × 203), and Japan (160 × 195). Always verify the centimeters.
Confusing the frame dimensions with the mattress. A frame's outer footprint and its inner mattress cavity are different; the mattress must match the inner cavity.
Not checking the delivery path. Measure your door, elevator, and hallway turns before you order. Large King and up regularly get stuck at corners.
Related Guides
Choosing a Mattress for Couples
Weight difference, motion isolation, temperature preference. How two people share one mattress and both sleep well.
Read more→Mattress Lifespan, Replacement Signs, and Care
How long a mattress should last by material, when to replace it, when a topper is enough, and how to make it last longer.
Read more→Find your ideal specs
Answer a few science-based questions and get science-based mattress specs tailored to your body and sleep style.
Start Free Matching