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**Coefficients of form** are dimensionless quantities used to relate the general shape of a ships hull through ratio's.

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The *block coefficient* is the ratio of underwater area divided by the multiplication of the maximum waterline length, breadth and draught. It is an indication of hull fullness. In formula form it can be written as C_{b}= ∇/LBT

The *prismatic coefficient* is the underwater area, divided by the area of a midship section, times the length of the ship. It is an indication of hull fineness, and may be broken down into fore & aft components.This formula can be written as C_{p}= ∇/A_{m}L

The *midship sectional coefficient* is the multiplication of waterline breadth and draught divided by the area below the waterline of the midship section. This formula may be written as C_{m}= A_{m}/BT

The *waterplane area coefficient* is the waterplane area divided by the length x the breadth.