Astrophysics Calculators

Astrophysics calculators provide essential computational tools for students, researchers, and astronomy enthusiasts to explore celestial mechanics and stellar properties. These calculators simplify complex astrophysical formulas for luminosity, magnitude systems, orbital dynamics, and relativistic phenomena, making cosmic calculations accessible and efficient.

Use these interactive astrophysics tools to calculate stellar luminosities, magnitude conversions, Schwarzschild radii, binary star periods, and cosmological distances. Each calculator implements standard astrophysical formulas with educational clarity, helping you understand the mathematical relationships that govern celestial objects and cosmic expansion.

⚠ Disclaimer: This calculator provides results based on standard formulas and simplified assumptions. It is intended for educational purposes only and should not be used for professional, medical, industrial, or experimental applications without expert verification.

Luminosity of Star

Radius R (m) Temperature T (K)

L = 4πR²σT⁴

Stellar Radius

Luminosity L (W) Temperature T (K)

Apparent Magnitude

Flux F (W/m²)

Absolute Magnitude

Apparent magnitude m Distance d (parsec)

M = m – 5 log₁₀(d/10)

Distance Modulus

Apparent magnitude m Absolute magnitude M

Schwarzschild Radius

Mass M (kg)

Rs = 2GM/c²

Chandrasekhar Limit Fraction

White dwarf mass M (kg)

Orbital Period of Binary Stars

Separation a (m) Total mass (kg)

P = 2π√(a³/GM)

Hubble’s Law Distance

Recession velocity v (km/s) Hubble constant H₀ (km/s/Mpc)

Escape Velocity (Neutron Star)

Mass M (kg) Radius R (m)