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Calcimator

Stellar Luminosity Calculator

Calculate stellar luminosity using Stefan-Boltzmann law. Find absolute magnitude, main sequence lifetime, and stellar parameters.

Inputs

Solar Radii
K
Solar Masses

Results

Luminosity

1.004 Solar Luminosities

Absolute Magnitude

4.83

Main Sequence Lifetime

10,000,000,000 billion years

Apparent Magnitude4.83
Surface Flux63,200,699.73 W/mΒ²
How to Use This Calculator
  1. Enter Stellar Radius (solar radii) β€” the Sun is 1 Rβ˜‰; giants like Betelgeuse exceed 1,000 Rβ˜‰.
  2. Enter Surface Temperature (K) from spectral classification: O stars >30,000 K, G stars ~5,000–6,000 K, M stars <3,500 K.
  3. Enter Stellar Mass (solar masses) to compute the Main Sequence Lifetime via the mass-luminosity relation.
  4. Read Luminosity (solar luminosities) and Absolute Magnitude to compare with catalog values.
  5. Use Main Sequence Lifetime (billion years) to understand how much longer the star will remain hydrogen-burning.
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Formula

L = 4Ο€RΒ²ΟƒT⁴ (Stefan-Boltzmann Law)

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