Ukiyo-e has a standardized sizing system.
"Oban" (39x27cm) is half the size of the standard-sized paper known as "O-bosho" (54x39cm), and "Chuban" size is a fourth of the original sheet.
Here are other sizes for your reference.
*Prints may vary from the stated standard dimensions. Please contact us for precise sizes.
O-bosho was the most common form of paper in the late Edo period.
|Oban||approx. 39×27cm||Half of O-bosh|
|Chuban||approx. 27×19.5cm||Half of Oban|
|Koban||approx. 19.5×13.5cm||Quarter of Oban|
|Tanzaku ban||approx. 39×13.5cm||Vertical quarter of O-bosho|
|Otanzaku ban||approx. 39×18cm||Vertical One-third of O-bosho|
|Hosoban||approx. 15.5×33cm||Vertical One-third of Kobosho|
|Aiban||approx. 23.5×33cm||Vertical Half of Kobosho|
|Nagaban||approx. 52×25.6cm||One-third of Takenaga-hosho|
|Hashira-e||approx. 13×77cm||Vertical quarter of Takenaga-hosho|