How do I simulate a pendulum clock?

Open this page and use the live Double Pendulum tool below — set your inputs and the simulation runs instantly in your browser using real numerics. No install, no account needed.

Yes. The simulation runs free in your browser. A one-time unlock or a Pro plan adds advanced parameters, saved presets, data import, and clean exports.

Can I use my own numbers?

Absolutely — every input is adjustable, and with data import you can drive a pendulum clock from your own measurements.

Use case · powered by Double Pendulum

Double Pendulum for a pendulum clock

Simulate a pendulum clock live in your browser. This runs the real Double Pendulum solver — adjust the inputs, watch it respond instantly, and export the result. No install, no account.

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Double Pendulum StudioLive

chaotic dynamics · RK4

Controls

Speed1×

Tiny changes in the start explode into totally different motion — deterministic chaos. Drag either bob to set a new starting position; it pauses playback automatically.

Presets

Lower bob mass

Gravity g

▶ Run in Python

Data Inspector

IntegratorRK4

SystemChaotic

DOF2

Lower bob mass10

Gravity g9.8

Governing equation

\ddot{θ}_{1} \ddot{θ}_{2} = \frac{- g ( 2 m _{1} + m _{2} ) sin θ _{1} - m _{2} g sin ( θ _{1} - 2 θ _{2} ) - 2 m _{2} sin ( θ _{1} - θ _{2} ) ( θ ˙ _{2}^{2} L _{2} + θ ˙ _{1}^{2} L _{1} cos ( θ _{1} - θ _{2} ) )}{L _{1} ( 2 m _{1} + m _{2} - m _{2} cos ( 2 θ _{1} - 2 θ _{2} ) )} = \frac{2 sin ( θ _{1} - θ _{2} ) ( θ ˙ _{1}^{2} L _{1} ( m _{1} + m _{2} ) + g ( m _{1} + m _{2} ) cos θ _{1} + θ ˙ _{2}^{2} L _{2} m _{2} cos ( θ _{1} - θ _{2} ) )}{L _{2} ( 2 m _{1} + m _{2} - m _{2} cos ( 2 θ _{1} - 2 θ _{2} ) )} m_{1} = 10, m_{2} = 10, L_{1} = L_{2} = 1.2, g = 9.8

Reading this result: Starting both arms at 90° (π/2) with lower-bob mass 10 and g 9.8 puts the pendulum firmly in its chaotic regime. Unlike a small-angle swing, which would be near-periodic, here trajectories that differ by 0.02 rad diverge exponentially — a positive Lyapunov exponent.

Runs locally in your browser — free forever. Scale to the cloud when reality gets heavy.

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About this simulation

The full Double Pendulum tool models a pendulum clock with the same numerics engineers and scientists use — running entirely client-side. Change any parameter and the result updates in real time, so you can build intuition, check a design, or teach the concept without spreadsheets or installs.

More you can do with Double Pendulum

Double Pendulum for a projectile from a cannon Double Pendulum for a bouncing ball Double Pendulum for a car braking Double Pendulum for a roller-coaster loop Double Pendulum for a satellite orbit Double Pendulum for a mass on a spring Double Pendulum for a skydiver's free fall Double Pendulum for a two-cart collision

Other ways to simulate a pendulum clock

Particle / N-Body for a pendulum clock Heat & Wave Fields for a pendulum clock GPU Compute (WebGPU) for a pendulum clock WebGPU Fluid for a pendulum clock GPU N-Body for a pendulum clock GPU PDE Solver for a pendulum clock

Frequently asked questions

How do I simulate a pendulum clock?: Open this page and use the live Double Pendulum tool below — set your inputs and the simulation runs instantly in your browser using real numerics. No install, no account needed.
Is it free?: Yes. The simulation runs free in your browser. A one-time unlock or a Pro plan adds advanced parameters, saved presets, data import, and clean exports.
Can I use my own numbers?: Absolutely — every input is adjustable, and with data import you can drive a pendulum clock from your own measurements.