Oscillations — pendulum and spring

The period of harmonic oscillations. For a simple pendulum it depends only on the length and the gravitational acceleration:

$T=2\pi\sqrt{\frac{l}{g}}$

(it depends neither on the mass nor, for small swings, on the amplitude). For a mass on a spring with spring constant $k$:

$T=2\pi\sqrt{\frac{m}{k}}$

From the period the calculator works out the frequency $f=\tfrac{1}{T}$ and the angular frequency $\omega=2\pi f$.