Enter the stellar parallax and the apparent magnitude into the Calculator. The calculator will evaluate the Absolute Magnitude. 

Absolute Magnitude Formula

The following two example problems outline the steps and information needed to calculate the Absolute Magnitude.

M = m + 5*(log(p) + 1)


  • M is the Absolute Magnitude ( )
  • m is the apparent magnitude 
  • p is the stellar parallax

How to Calculate Absolute Magnitude?

The following steps outline how to calculate the Absolute Magnitude.

  1. First, determine the stellar parallax. 
  2. Next, determine the apparent magnitude. 
  3. Next, gather the formula from above = M = m + 5*(log(p) + 1).
  4. Finally, calculate the Absolute Magnitude.
  5. After inserting the variables and calculating the result, check your answer with the calculator above.

Example Problem : 

Use the following variables as an example problem to test your knowledge.

stellar parallax = 30

apparent magnitude = 4

M = m + 5*(log(p) + 1) = ?