Mattress Size Chart (Korea, US, UK, EU)

Understanding the mattress size chart — concept and principle

Mattress size names sound alike across countries but do not mean the same dimensions. A "queen" or "king" bought in Korea, the United States or Europe can differ by several centimetres in width, which matters when you order a bed frame, a fitted sheet or a mattress from abroad. This chart looks up a size name and shows the usual Korean dimensions in centimetres together with the matching US size in inches and centimetres.

How it is calculated

There is no formula: the calculator reads one row of a fixed reference table. The chart pairs these sizes (width × length):

• Single / Twin: Korea 100 × 200 cm; US 38 × 75 in (97 × 191 cm)
• Super single / Twin XL: Korea 110 × 200 cm; US 38 × 80 in (97 × 203 cm)
• Double / Full: Korea 140 × 200 cm; US 54 × 75 in (137 × 191 cm)
• Queen: Korea 150 × 200 cm; US 60 × 80 in (152 × 203 cm)
• King: Korea 160 × 200 cm; US 76 × 80 in (193 × 203 cm)
• Large king (Korea): 180 × 200 cm; California king (US, a separate size): 72 × 84 in (183 × 213 cm)

US centimetre values are the inch values × 2.54, rounded to whole centimetres.

The principle

Each market grew its own conventions. Korean beds mostly follow metric widths in 10 cm steps with a 200 cm length that suits most adults. US sizes come from inch-based manufacturing, and the US "king" was made by joining two twin-width mattresses (2 × 38 = 76 in), which is why it is so wide. The California king trades width for length (72 × 84 in). Because names were coined separately, the same word can describe quite different beds, so always compare the actual numbers.

Worked example

1. Input: size = Queen.
2. Korea: 150 × 200 cm.
3. US: 60 × 80 in. Converting: 60 × 2.54 = 152.4 cm and 80 × 2.54 = 203.2 cm, rounded to 152 × 203 cm.
4. So a US queen is about 2 cm wider and 3 cm longer than a typical Korean queen.

How to read the result

Differences of 2–3 cm usually matter for fitted sheets and tight frames, less for loose duvets. Larger names differ more: a Korean king (about 160 cm wide) is much narrower than a US king (about 193 cm). For two adults, many people find widths from about 150 cm comfortable, but this is a matter of preference and room size.

Common mistakes

• Ordering a "king" frame from a US retailer for a Korean king mattress, a width gap of over 30 cm.
• Forgetting mattress height (depth) when buying fitted sheets; pocket depth must exceed it.
• Relying on the size name alone; Korean makers can vary by a few centimetres, and European sizes (such as 140 × 200, 160 × 200, 180 × 200 cm) use different names again.

Frequently asked questions

How wide is a Korean queen mattress?

Usually about 150 cm, compared with about 152 cm (60 in) for a US queen.

Is a Korean king the same as a US king?

No. A Korean king is typically about 160 cm wide; a US king is about 193 cm (76 in).

What is a super single?

A Korean size of about 110 × 200 cm, between a single and a double, popular for one adult.

Sources: International Sleep Products Association (ISPA), standard US mattress dimensions · NIST Special Publication 811 (2008), Appendix B (1 in = 2.54 cm exactly)