 The period depends on the length of the pendulum, and also to a slight degree on its weight distribution (the moment of inertia about its own center of mass) and the amplitude (width) of the pendulum's swing.For a point mass on a weightless string of length "L" swinging with an infinitesimally small amplitude, without resistance, the length of the string of a seconds pendulum is equal to "L = g/π2" where "g" is the acceleration due to gravity, with units of length per second squared, and "L" is the length of the string in the same units.Using the SI recommended acceleration due to gravity of g0 = 9.80665 m/s2, the length of the string will be approximately 993.6 millimeters, i.e.