Find here the period of oscillation equation for calculating the time period of a simple pendulum. The period of a pendulum formula is defined as T = 2 x π √(L/g), where T is the period, L is the length and g is the Acceleration of gravity. The period of oscillation demonstrates a single resonant frequency. It can be calculated by dividing the length from the acceleration of gravity and taking the square root of the value. Finally, the obtained value is multiplied with 2 x π.