Orbital Period Calculator

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Calculates the time it takes for an object to complete one orbit around another object using Kepler's Third Law.

How To Use

How to use this calculator

Start with your values, or try a preset.

Step 1

Enter Semi-major axis (a) and Standard gravitational parameter (μ) in the units shown.

Step 2

Read Orbital Period (seconds) and Orbital Period (days) in the results panel. Results update as you change the inputs.

Step 3

Choose a preset to load an example, then adjust the values for your situation.

Worked Examples

See the inputs and their calculated results.

Semi-major axis (a): 149,600,000,000 m; Standard gravitational parameter (μ): 132,700,000,000,000,000,000 m³/s²

Orbital Period (seconds): 31,560,349.01 s; Orbital Period (days): 365.2818173 days

Semi-major axis (a): 384,400,000 m; Standard gravitational parameter (μ): 132,700,000,000,000,000,000 m³/s²

Orbital Period (seconds): 4,110.73495 s; Orbital Period (days): 0.04757795081 days

Semi-major axis (a): 227,900,000,000 m; Standard gravitational parameter (μ): 132,700,000,000,000,000,000 m³/s²

Orbital Period (seconds): 59,341,824.48 s; Orbital Period (days): 686.8266722 days

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