Principles of shoe design based on size standards

The standard size of each foot is size 42, which is based on the French centimeter, which all Iranian designers design and produce with this size.

To convert French Centimeters to Centimeters from the formula
Foot size x 6.66 = the height of the sole of the shoe mold
For example, 6.66 x 42 = 279.72
This formula is correct if the mold size is standard and if the shoe mold is not modeled (pointed mold).

The standard of the back of the shoe, so as not to injure the back of the foot from the formula
Foot size x 6.66 = mold height ÷ 5 = shoe back height size
In sports shoes, if the back of the shoe is cloudy, it is considered under-clouding, for example
42×6.66=279.72÷5=55.944
This number is calculated from the inside of the shoe (the thickness of the sole inside the shoe is deducted)

Standard foot width or in other words foot chest with formula
Foot size x 6.66 = mold height ÷ 3 = the standard size of the chest of the sole of the shoe mold, which is the same in all models.

The standard width on the leg or in other words the chest of the leg
Foot size x 6.66 = mold height ÷ 3 x 2 = chest size on foot
In other words, if the height of your shoe mold is standard, the height of the shoe mold is equal around the chest of your shoe mold
For example, the height of the mold is 27.272 cm around the chest of your shoe mold.