Pendulum Period Calculator
Find a pendulum’s swing period.
Result
How to use
- Enter your values in the fields above.
- Press Calculate to see your result instantly.
- Use the Share button to copy a link to your result.
About this calculator
This calculator applies the simple-pendulum formula T = 2π√(L/g), which holds for small swing angles (roughly under 15°) and assumes an idealized point mass on a massless string, giving the period — the time for one full back-and-forth swing.
It's used by physics students verifying lab measurements, hobbyists and clockmakers designing pendulum clocks where the length directly sets the tick rate, and anyone using a pendulum's known period to estimate local gravitational acceleration experimentally.
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