Luminosity Calculator

Enter the radius and temperature of a start into the calculator to determine it’s luminosity.

Luminosity Formula

The following formula is used to calculate the luminosity of a star.

L = 4 * pi * R2 * SB * T4

  • Where L is the luminosity
  • R is the radius of the star (m)
  • SB is the stefan-boltzmann constant (5.670*10-8 W*m-2 * K-4 )
  • T is the temperature (K)


What is luminosity?

Luminosity is a measure of the radiant power given off by an object. This object is most often a start or large celestial body.

What is radiant power?

Radiant power is the total energy emitted by light producing object through radiant flux.

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