Calculate the orbital period or semi-major axis of a body orbiting a star using Kepler's third law. This relates the orbital period to the distance from the central mass.
Enter your values below
Earth: 1.5×10¹¹ m (1 AU)
Sun: 2×10³⁰ kg
Earth: 365.25 days
How this calculator works
Orbital period squared equals four pi squared divided by gravitational constant times central mass, times semi-major axis cubed.
Common questions about this calculator
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