Japanese mattress sizes follow a different standard from Singapore's sizing, which can cause confusion when purchasing furniture or bedding from Japan or Japanese-inspired brands. This guide explains the key Japanese mattress dimensions and how they compare to Singapore's standard sizes.
Standard Japanese Mattress Sizes
Japanese mattress sizes are generally smaller than their Western equivalents, reflecting the traditionally more compact dimensions of Japanese homes and the floor-level sleeping culture that uses space efficiently.
The main Japanese futon and mattress sizes are as follows, with approximate centimetre measurements:
Single, known as shinguru in Japanese, is approximately 97 by 195 centimetres. This is slightly wider and longer than Singapore's standard single at 91 by 190 centimetres.
Semi-double, known as semu daburu, is approximately 120 by 195 centimetres. This size has no direct Singapore equivalent and falls between Singapore's single and double in width.
Double, known as daburu, is approximately 140 by 195 centimetres. This is very close to Singapore's standard double at approximately 137 by 190 centimetres.
Queen, known as kuiin, is approximately 160 by 195 centimetres. This corresponds to a European queen dimension and is wider than Singapore's standard queen at 152 to 153 centimetres.
King, known as kingu, is approximately 180 by 195 centimetres. This is close to Singapore's king at 183 by 190 centimetres.
All Japanese standard sizes use a consistent 195-centimetre length, 5 centimetres longer than Singapore's 190-centimetre standard.
What This Means When Buying in Singapore
For most Singapore residents, Japanese sizing is only relevant when purchasing a bed frame or futon/mattress from a Japanese retailer, when using imported Japanese bedroom furniture, or when referencing Japanese-brand products sold locally.
Japanese bed frames designed for the above dimensions will require mattresses in those specific sizes. A Singapore standard single at 91 by 190 centimetres will not fill a Japanese single frame designed for 97 by 195 centimetres correctly.
When using Japanese-made furniture in Singapore, confirm the exact centimetre dimensions and source a mattress to match those specifications, or confirm with the retailer whether a standard Singapore size is compatible.
For those who want the aesthetic of Japanese bedroom design without the sizing complexity, most Japanese minimalist bed frame aesthetics are available in Singapore standard dimensions from local furniture retailers.
Practical Considerations
The 5-centimetre length difference between Japanese sizing at 195 centimetres and Singapore standard at 190 centimetres means Japanese fitted sheets will be slightly loose on a Singapore mattress at the foot end. A Singapore fitted sheet will be slightly short for a Japanese mattress.
The width differences between Japanese semi-double and Singapore sizing mean bedding is not easily interchangeable between these two standards without excess fabric or poor fit.
For Singapore homes, sourcing mattresses and bedding in Singapore standard dimensions from local retailers remains the most practical approach. For those specifically working with Japanese furniture or futons, confirming exact centimetre dimensions before purchasing any component is essential.
The Somnuz mattress collection includes options in Singapore standard dimensions across all standard sizes. For guidance on sizing or to compare options, visit our showroom in Singapore. The Sleep Well resource page covers broader sleep environment guidance.
Frequently Asked Questions
What are Japanese mattress size dimensions?
Japanese standard sizes are: single approximately 97 by 195 cm, semi-double approximately 120 by 195 cm, double approximately 140 by 195 cm, queen approximately 160 by 195 cm, and king approximately 180 by 195 cm.
Is Japanese single the same as Singapore single?
No. Japanese single is approximately 97 by 195 cm. Singapore single is approximately 91 by 190 cm. Japanese single is 6 cm wider and 5 cm longer.
Will Singapore mattresses fit Japanese bed frames?
Not precisely. The dimension differences mean a Singapore mattress will not fill a Japanese frame correctly. Sourcing a mattress matched to the Japanese frame's specifications or confirming compatibility with the retailer is the appropriate approach.
Does Japan use a semi-double size?
Yes. The semi-double at approximately 120 by 195 cm is a standard size in Japan and is popular for solo adult sleepers who want more width than a single. This size has no direct equivalent in Singapore's standard sizing.
Are Japanese mattresses thinner than Western ones?
Traditional Japanese futon mats are considerably thinner, typically 5 to 10 centimetres. Modern Japanese mattresses for Western-style beds are available in comparable thicknesses to Western options. The thinness of traditional futons reflects the floor-level sleeping culture and the need for the mat to roll or fold for storage.
Can I buy Japanese-sized mattresses in Singapore?
Some retailers may accommodate custom or non-standard dimensions. For standard Japanese sizes, contact retailers directly with exact centimetre requirements. For most Singapore homes, standard Singapore sizing is more practical.
Find the Right Mattress for Your Home in Singapore
Whether working with Japanese dimensions or Singapore standard sizing, accurate measurements are the foundation of a well-fitting setup.
Browse the Somnuz mattress collection for Singapore standard size options. Or visit our showroom for guidance on sizing and what suits your sleep.