Python function NameError [duplicate]

Answer 1

Put your function first:

def calcHullSpeed(LWL):
    maxHS = 1.34*math.sqrt(LWL)
    return maxHS

LWL = float(input("Enter the length of the boat: "))
maxHullSpeed = calcHullSpeed(LWL)
print("The hull speed is: " + str(round(maxHullSpeed,2)))

Functions have to be defined before you call them.