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Calcimator

Orbital Period Calculator

Calculate orbital period using Kepler's laws. Find orbital velocity, angular velocity, and perihelion/aphelion distances.

Inputs

AU
Solar Masses

Results

Orbital Period

1 years

Orbital Period

365.25 days

Orbital Velocity

29,785.68 m/s

Angular Velocity0.017202 rad/day
Perihelion Distance1 AU
Aphelion Distance1 AU
How to Use This Calculator
  1. Enter the Semi-Major Axis (AU) of the orbit β€” Earth's is 1 AU, Mars is 1.524 AU.
  2. Enter the Central Mass (solar masses) of the star or body being orbited β€” the Sun is 1 Mβ˜‰.
  3. Set Orbital Eccentricity (0–0.99): 0 is circular, Earth's is 0.017, Pluto's is 0.25.
  4. Read Orbital Period (years and days), Mean Orbital Velocity (m/s), and Perihelion/Aphelion distances (AU).
  5. Use the orbital period to plan observation timing or to verify radial velocity measurements.
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Formula

TΒ² = (4π² / GM) Γ— aΒ³ (Kepler's Third Law)

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