What is the formula to calculate minimum thickness of steel plate?

The minimum thickness of a steel plate can be calculated using the formula ( t = \frac{P}{(2 \cdot S \cdot L)} ), where ( t ) is the plate thickness, ( P ) is the applied load, ( S ) is the allowable stress of the steel, and ( L ) is the length of the plate. Additionally, factors such as material properties, environmental conditions, and safety factors may also need to be considered, depending on the application. It's important to consult relevant design codes and standards for specific engineering requirements.