What is the meaning of a calligraphy ruler? How many sizes of calligraphy feet are there?

Shu Din is the square foot of the work

Four feet is the four square feet

The standard four feet of rice paper is 8 square feet

Four square feet can be four feet of doufang (69*69CM)

About 2*2=4 square feet

Or four feet of banner (34*138CM)

About 1*4 feet = 4 square feet

Or four feet of banner (33*33.3CM)

About 1*4 feet = 4 square feet

Or one square feet = 4 square feet. 4 square feet

There is also a 33.3*33.3CM for one square foot

The difference between the top and bottom will not be too big

Commonly used Xuan paper specifications (unit: centimeter)

Small three-foot:50*100

Large three-foot:69*100

Four-foot:69*138

Five-foot:84*153

Five-foot:84*153

Two-foot: 1*2=4 square feet

Only one square foot is for one square foot. *153

Six-foot:97*180

Eight-foot:124.2*248.4

Zhang Er:144.9*367.9