Pendulum Calculator

Calculate pendulum period, length, and frequency.

Enter Parameters

Select what to solve for

Solve For

Pendulum Length (L)

Period (T)

Gravity (g)

Enter your values above to see the result.

Frequency (f)

Angular Freq. (ω)

Small-angle approximation: valid for θ < 15°. For larger amplitudes the true period is slightly longer.

Pendulum Formulas

T = 2π√(L/g)
f = 1/T
ω = 2π/T = √(g/L)

T: Period (seconds per swing)
L: Pendulum length (m)
g: Gravitational acceleration (m/s²)
f: Frequency (Hz = swings/s)
ω: Angular frequency (rad/s)

Related Calculators

Planet Gravity (m/s²)

Mercury: 3.70 Venus: 8.87
Earth: 9.81     Moon: 1.62
Mars: 3.72      Jupiter: 24.8
Saturn: 10.4    Neptune: 11.2

Pro Tips

Results update as you type — change any field to see the effect immediately.

Check that every value uses the same unit before comparing results.

Use the copy button to paste the pendulum figures into a note or spreadsheet.

Nothing is sent to a server, so you can use this with private figures.