Rotational Velocity of Star Calculator

Calculate a Star's Rotational Velocity

Solar Radii (R☉)
Input the star's radius in Solar Radii (1 R☉ = 695,700 km).
Days
Input the star's rotational period in Earth days.

Calculation Result:

The estimated Rotational Velocity (v) is: km/s

Use this free online calculator to determine the rotational velocity of a star based on its radius and rotational period. Essential for astrophysics students and anyone curious about stellar mechanics and how fast stars spin.

Formula:

The rotational velocity (v) of a star at its equator can be calculated using the formula:
v = (2πR) / T
Where:

  • v = Rotational Velocity (in km/s)
  • π = Pi (approximately 3.14159)
  • R = Stellar Radius (in km)
  • T = Rotational Period (in seconds)

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