Pendulum Period Calculator
Calculate the period of a simple pendulum (small-angle approximation).
About this calculator
The Pendulum Period Calculator on NumberCals is a free, mobile-friendly tool for anyone needing to calculate the period of a simple pendulum (small-angle approximation). Enter your values in the form below and the result is computed instantly — no sign-up, no installation, no waiting.
Formula used
T = 2π·√(L/g)
What you'll need
- Length (m) (e.g. 1)
- Gravity (m/s², default 9.81) (e.g. 9.81)
What you'll get
- Period T (s)
- Frequency (Hz)
Formula
T = 2π·√(L/g)
Result
Frequently Asked Questions
Why doesn't mass appear? +
Because for a simple pendulum (small angle, point mass on a massless rod), period depends only on length and gravity — not on mass.
Why 'small-angle'? +
For angles below ~15°, the period is essentially constant. At larger angles, the period grows slightly with amplitude.
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