Orbital Period Calculator

Your details

Choose which orbital parameter you want to find. The other two become inputs.
Use satellite mode when the orbiting body is much lighter than the central body (Earth around the Sun, ISS around Earth). Use binary mode when both masses are comparable (binary stars, Pluto-Charon).
The average of the periapsis and apoapsis distances. For a circular orbit this equals the orbital radius.
Mass of the central body (the body being orbited).
Orbital Period (T)
0.999893

Time for one complete orbit

Period (human-readable)365.2109 d
Mean orbital velocity29.7884km/s
Escape velocity42.1272km/s
Orbital velocity (km/s)29.7884
Escape velocity (km/s)42.1272

Orbital period is 365.2109 d.

  • The orbiting body travels at an average speed of 29.79 km/s along its orbit.
  • The escape velocity from this orbital distance is 42.13 km/s - about 1.41 times the orbital speed.
  • An orbit at 1 AU is comparable to Earth's orbit region.

Next stepKepler's Third Law holds exactly only for two-body systems. For high-precision work (e.g., GPS satellites or relativistic binaries) corrections for oblateness, atmospheric drag, and general relativity apply.

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