Science Calculators
Pendulum Period Calculator
Enter a pendulum's length to calculate its period (time for one full swing) and frequency.
2.006s
period (one full swing)
0.498 Hz
frequency
Uses the small-angle simple pendulum formula T = 2π√(L/g) with standard gravity (9.81 m/s²) — accurate for swings under about 15-20°. A 1-meter pendulum has a period of roughly 2 seconds, the basis of the historical "seconds pendulum."
How to use this tool
- 1Enter the pendulum length in meters.
- 2See the calculated period and frequency.
Frequently asked questions
Does the pendulum's mass or swing angle matter?+
Mass doesn't affect the period at all. Swing angle only matters for large angles — this formula assumes a small-angle swing (roughly under 15-20°), the standard simple pendulum approximation.