Orbital Period (Kepler's Third Law) Calculator

Property to Calculate:

Orbital Period (T):

Length of the semi-major axis (a):

Mass of the central body (M):

How This Is Calculated

$$ T^2 = \frac{4 \pi^2 a^3}{GM} $$ where:

T = Orbital Period (s)

a = Length of the semi-major axis (m)

G = Gravitational Constant (6.674 x 10^-11 Nm²kg^-2)

M = Mass of the central body (kg)

Assumptions

The objects are treated as point masses.
The mass distribution of the objects are spherically symmertric.
The bodies are in stable circular or eliptical orbits.
The system is simplied to the interaction between two bodies.

Related Calculators

Delta-V for Hohmann Transfer

Escape Velocity

Hohmann Transfer

Newton's Univeral Law of Gravitation

Orbital Inclination