Astronomy Calculators

Stars, planets and space calculations. 51 free online astronomy calculators.

Calculators

• Light-Year Calculator
• Escape Velocity Calculator
• Orbital Period Calculator
• Kepler Third Law Calculator
• Schwarzschild Radius Calculator
• Orbital Velocity Calculator
• Hubble's Law Calculator
• Orbital Period Calculator
• Vis-Viva Orbital Velocity Calculator
• Circular Orbit Velocity Calculator
• Escape Velocity Calculator
• Escape Energy Calculator
• Kepler Third Law Calculator
• Geostationary Orbit Radius Calculator
• Mean Motion Calculator
• Orbital Eccentricity Calculator
• Specific Orbital Energy Calculator
• Specific Angular Momentum Calculator
• Areal Velocity Calculator
• Orbital Period from Altitude Calculator
• Schwarzschild Radius Calculator
• Hawking Temperature Calculator
• Photon Sphere Radius Calculator
• ISCO Radius Calculator
• Hubble's Law Calculator
• Hubble Distance Calculator
• Critical Density Calculator
• Cosmological Redshift Calculator
• Doppler Velocity from Redshift Calculator
• Light Travel Time Calculator
• Stellar Luminosity Calculator
• Wien's Displacement Calculator
• Mass–Luminosity Relation Calculator
• Main-Sequence Lifetime Calculator
• Stellar Surface Gravity Calculator
• Eddington Luminosity Calculator
• Distance Modulus Calculator
• Absolute Magnitude Calculator
• Magnitude–Flux Ratio Calculator
• Luminosity from Flux Calculator
• Planetary Equilibrium Temperature Calculator
• Stellar Parallax Distance Calculator
• Bond Albedo Calculator
• Angular Diameter Calculator
• Angular Resolution Calculator
• Synodic Period Calculator
• Tidal Force Calculator
• Roche Limit Calculator
• Parsec Converter
• Light-Year Converter
• Astronomical Unit Converter