// multi-utility computation suite · offline · instant · precise
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sci.stellar-luminosity Calculator
Calculates stellar luminosity from radius and effective temperature using the Stefan-Boltzmann law: L = 4πR²σT⁴. A star with twice the radius and same temperature radiates 4× more — same radius at twice the temperature radiates 16× more.
Inputs
Radius Solar
Distance from centre to edge of a circle. Radius = diameter / 2.
Temp K
Thermal state of the substance. Check whether the formula needs Celsius, Fahrenheit, or Kelvin (K = °C + 273.15).
Distance Ly
Separation between two points or total path length. Check that units are consistent throughout the calculation.
Results
luminosity (solar units)
Total power output of a star or light source in watts or solar luminosities. Relates to absolute magnitude.
luminosity (watts)
Total power output of a star or light source in watts or solar luminosities. Relates to absolute magnitude.
flux ratio vs Sun at same dist
The proportional relationship between two quantities.