Pendulum Period Calculator
Fill in the values and the answer updates as you type.
How the Pendulum Period Calculator works
T = 2π × √(L ÷ g). The formula works well for small swing angles (under about 15°). Example: with Pendulum length 1 m, and Gravity 9.80665 m/s², the result is Period (s) = 2.0064; Frequency (Hz) = 0.4984; Swings per minute = 29.9.
Inputs and results
The Pendulum Period Calculator takes 2 inputs and gives 3 results.
What you enter
- Pendulum length (m) — starts at 1.
- Gravity (m/s²) — starts at 9.80665.
What you get
- Period (s)
- Frequency (Hz)
- Swings per minute
Example: Pendulum Period Calculator with the starting values
With pendulum length 1 m and gravity 9.80665 m/s², the calculator returns:
| Period (s) | 2.0064 |
|---|---|
| Frequency (Hz) | 0.4984 |
| Swings per minute | 29.9 |
Change any value above and the results update straight away.
Pendulum Period Calculator FAQ
How do I use the Pendulum Period Calculator?
Enter pendulum length and gravity in the fields, then read period (s), frequency (hz) and swings per minute in the result panel. The answer updates as you type, and you can press Calculate or Enter to refresh it. Use “Copy link” to share your exact numbers with someone else.
What does the Pendulum Period Calculator calculate?
Period and frequency of a simple pendulum. It returns period (s), frequency (hz) and swings per minute from the 2 values you provide.
What values does the Pendulum Period Calculator start with?
It opens with pendulum length 1 m and gravity 9.80665 m/s² so you can see a working result straight away. Replace them with your own numbers, or press Reset to return to these starting values.
Is the Pendulum Period Calculator free and private?
Yes. It is free, needs no account, and runs in your browser, so nothing you type is sent to or stored on our servers. See the Privacy Policy for details.
Can I rely on the Pendulum Period Calculator for important decisions?
Treat the result as a well-rounded estimate. Real situations often have details a general calculator cannot know, so confirm important decisions with a qualified professional. See the Disclaimer for more.