Circular Orbit Time Period Calculator

The circular orbital period also know as the revolution period is the time taken by an object to complete one orbit around a celestial body. The orbit is a regular, repeating path and refers to the time it takes for a celestial body to orbit around its star, such as the Moon's orbit around the Earth or the time it takes for the Earth to orbit the Sun. The orbital period for a circular orbit is calculated from Kepler’s third law (law of periods) which states that the square of the time period of any satellite is proportional to the cube of the semi-major axis of its elliptical orbit. Here for orbital period calculation, we assume a circular orbit with radius ‘r’.

Enter the Radius and Mass of the Central Object


  • Orbital Period
  • Orbital Period
  • Orbital Period
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The orbital radius can be calculated for different orbits such as

  • Low-Earth Orbit – Altitude from Earth's surface 200-2000 Km
  • Medium-Earth Orbit – Altitude from Earth's surface 2000 Km to 35,786 Km