Under normal circumstances, the thickness of the oil painting frame is 1.6cm~2.5cm, but the specifics still need to be based on the requirements of different manufacturers, shops, merchants, and users, because oil painting frames can also be customized according to personal wishes, and the size cannot be completely unified.
The international size standard of oil painting frames is generally the common size specification of the inner frame of the oil painting frame. The height and width ratio of oil painting pictures is divided into three types: figure, landscape, and seascape according to traditional habits. Each type can be from 0 to 120 or 500 according to the size. There are more than 20 kinds of numbers. The standard sizes of various countries vary slightly according to their respective measurement units or traditional customs.