Orbital Velocity & Period Calculator
Circular orbit speed, period and escape velocity at a given altitude above any planet or star.
How to use the Orbital Velocity & Period Calculator
- Enter or select: Central body mass M, Central body radius, Altitude h.
- The results (Orbital radius, Orbital speed, Orbital period, Escape velocity at this height, Gravity at this height, Specific orbital energy) are calculated instantly as you type.
- Use “Copy link” to share the calculation with the same input values.
Formula
- v = √(GM/r)
- T = 2π√(r³/GM)
- v_esc = √(2GM/r)