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`Dm = 2.5 log_{10}(r)`

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The **Difference in Magnitudes from Flux Ratio** calculator computes the difference in magnitude (**Dm**) based on the Flux Ratio (**r**). Two objects have differing intensities as measured by an observer. The ratio of the measured intensities (or "fluxes") is given as "r". These two objects have different astronomical "magnitudes". The difference in their magnitudes is given by this formula.

**INSTRUCTIONS:** Enter the following:

- (
**r) R**atio of Measured Intensities

**Difference in Magnitude (Dm):** The calculator returns the difference in magnitude.

The **Astronomy Calculator Suite** includes functions that are useful for studying astronomy and include the following:

- Kepler's 3
^{rd}Law formula T² = (4π • R³)/(G • M) - Small Angle Formula
*Small Angle Formula**α = S / D* - Flux and Magnitude formulas
- Telescope formulas
- Mass formulas
**Mass from Luminosity****Mass from Acceleration and Radius****Mass from Speed and Separation****Mass of extra-solar planet from mass of star, radius of star orbit and radius of exoplanet orbit****Mass of extra-solar planet from mass and velocity of star and velocity of planet****Black Hole Mass Calculator****Black Hole Event Horizon Calculator**

- Relative Size Formulas
- Wavelength Formulas
- Other Formulas
**Distance from absolute and apparent magnitude****Radius from Speed and Period****Speed of Circular Motion****Hubble Time****Galaxy Recession Velocity****Luminosity from Mass****Hubble's Law****Exoplanet Calculator****Orbital Radial Acceleration****Distance to Barycenter****Sakuma-Hattori Equation****Astronomical Distance Calculator**provides the distance from the Earth to numerous astronomical bodies (e.g. Sun, Moon, planets, stars, Milky Way's Center and Edge, Andromeda Galaxy)**Astronomical Distance Travel Time Calculator**computes the time to travel to distant parts of space at different velocities.**3D Vector Calculator****Drake Equation Calculator****Seager Equation Calculator****Friedman Equation Calculator****Lagrange Points L1 and L2****Schwarzschild Radius****Hill Sphere Radius****Escape Velocity**