Astronomy & Earth Science
Orbital Period Calculator
Lets users compute and verify orbital period instantly with formula, steps and examples — no manual math.
Enter your details
AU
solar masses
Your result
Orbital period
1 years
Kepler's third law: T = √(a³/M) = 1.000 years.
In days
365.25 days
About this calculator
Kepler's third law (in solar units): T² = a³ / M, so T = √(a³/M) years with a in AU and M in solar masses. Earth: a=1, M=1 → T=1 year.
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