Apparent vs Absolute Magnitude Converter
Enter any two of apparent magnitude, absolute magnitude, and distance in parsecs to solve for the missing value.
A QUICK WALKTHROUGH
How to use this tool
- Enter exactly two of apparent magnitude, absolute magnitude, and distance in parsecs.
- Calculate the one missing value.
- Read the distance in parsecs and its approximate light-year equivalent.
Distance modulus
The relation is m − M = 5 log10(d/10), where m is apparent magnitude, M is absolute magnitude, and d is distance in parsecs. Exactly two inputs are required.
Parsecs and light-years
Distance is entered and solved in parsecs. The tool also shows an approximate conversion using 1 parsec ≈ 3.26156 light-years; these units are not interchangeable labels.
Scope
This is a mathematical converter only. It does not provide observing, stellar, or other astronomy advice.
GOOD TO KNOW
Common questions
What units does distance use?
Parsecs for the calculation; light-years are shown only as an approximate equivalent.
Can I enter all three values?
No. Leave exactly one field blank so the converter knows what to solve.