Period of a 1 Metre Pendulum on Earth
A 1 metre pendulum on Earth (g = 9.81 m/s²) has a period of approximately 2.006 seconds.
How to use this tool
- Enter pendulum length l, gravity g and amplitude θ in the fields above.
- Results update instantly as you type — or click Calculate.
- Read your period (small-angle approx.) and the full breakdown beneath it.
A 1 m pendulum completes one full swing in almost exactly 2 seconds — this is why grandfather clocks traditionally use a 1 m pendulum rod.
Frequently asked questions
- What is the period of a 1-metre pendulum on Earth?
- Approximately 2.006 seconds, which is why 1-metre pendulums were historically used in grandfather clocks (half-period ≈ 1 s per swing).
- Does mass affect the period?
- No — the small-angle period T = 2π√(L/g) is entirely independent of mass.