a simple pendulum is formed by suspending a mass point from an absolutely flexible line with constant length and negligible mass, and making periodic motion in the vertical plane under the action of gravity. when a simple pendulum vibrates under the condition that the swing angle is less than 5° (now generally considered to be less than 10°), it can be approximately considered to be simple harmonic motion. the periodic formula of a simple pendulum motion: t=2π√(l/g). where l refers to the length of the pendulum and g is the local gravity acceleration.

pendulum calculator

period: t²=4PI²*L/g

t = period

l = pendulum length

g = acceleration due to gravity