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Apparent Magnitude Brightness Ratio Calculator

Brightness ratio of two stars from their magnitudes.

Compute the brightness ratio of two stars from their apparent magnitudes using Pogson's relation: F1/F2 = 10^((m2 − m1)/2.5).

Dr. Helena Ortiz By Dr. Helena Ortiz
Published Last reviewed 1 min read

Inputs

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

F₁ / F₂ = 10^((m₂ − m₁) / 2.5)

In depth

Compute the brightness ratio of two stars from their apparent magnitudes using Pogson's relation: F1/F2 = 10^((m2 − m1)/2.5).