Compare calculators

Both calculators run independently — change the inputs on either side to compare results.

Magnitude Difference Calculator

Convert the difference between two stellar magnitudes into a brightness ratio. Essential for comparing how much brighter or dimmer one celestial object is relative to another.

First Magnitude (mag)

Second Magnitude (mag)

Fill in the required fields to see your result.

Astronomy

Stellar Luminosity Calculator

Compute a star's luminosity in solar units (L☉) from its radius and surface temperature via the Stefan-Boltzmann law. The fundamental relationship between stellar size, temperature, and total energy output — and the basis of the Hertzsprung-Russell diagram.

Stellar Radius (R☉)

Surface Temperature (K)

Fill in the required fields to see your result.

Key differences

	Magnitude Difference Calculator	Stellar Luminosity Calculator
Category	Astronomy	Astronomy
Inputs required	2	2
Result	Brightness Ratio	Stellar Luminosity (L☉)
What it does	Convert the difference between two stellar magnitudes into a brightness ratio. Essential for comparing how much brighter or dimmer one celestial object is relative to another.	Compute a star's luminosity in solar units (L☉) from its radius and surface temperature via the Stefan-Boltzmann law. The fundamental relationship between stellar size, temperature, and total energy output — and the basis of the Hertzsprung-Russell diagram.