Shock factor
Shock factor is a commonly used figure of merit for estimating the amount of shock experienced by a naval target from an underwater explosion as a function of explosive charge weight, slant range, and depression angle (between vessel and charge). == Equation == S F = W R ( 1 + sin ϕ ) 2 {\displaystyle SF={\frac {\sqrt {W}}{R}}{{(1+\sin \phi )} \over 2}} R is the slant range in feet W is the equivalent TNT charge weight in pounds = charge weight (lbs) · Relative effectiveness factor ϕ {\displaystyle \phi } is the depression angle between the hull and warhead.