How this calculator works
Enter the values for first value, second value and review the units before calculating.
Formula / method
T = 2π√(r³ ÷ GM)
Worked example
A circular orbit 6,671 km from Earth’s center takes about 90 minutes.
Assumptions and limitations
The orbit is circular and the central body is treated as a point mass.
Atmospheric drag, oblateness, third bodies and relativistic corrections are omitted.