Astronomy and space Calculators: All 60 Tools
Every astronomy and space calculator on CalculatorHub, 60 in total, listed alphabetically. Each one is free, works in your browser with no signup, and shows the method it uses. Where a result depends on an external rate, standard or dataset, the supporting source is shown on the page with the date it was last checked. Prefer to search across all 6,718 calculators? Use the tool finder.
- Airmass Calculator: Secant And Kasten-Young
- Angular Diameter Calculator: Apparent Size in the Sky
- Angular Size Calculator: Degrees, Arcminutes, and Arcseconds
- Apparent Magnitude Calculator
- Astronomical Distance Converter: AU, Light-Year, Parsec, km
- CCD Pixel Scale Calculator
- Chandrasekhar Limit Calculator: White Dwarf Mass
- Dawes Limit Calculator
- Drake Equation Calculator
- Exoplanet Equilibrium Temperature Calculator
- Exoplanet Transit Depth Calculator: (Rp/R_star)^2
- Geostationary Orbit Altitude Calculator
- Gravitational Time Dilation Calculator: General Relativity
- Habitable Zone Calculator: Liquid Water Zone Around a Star
- Hawking Temperature Calculator: Black Hole Radiation
- Hill Sphere Radius Calculator (Gravity Reach)
- Hohmann Transfer Delta-V Calculator
- Jeans Mass Calculator: Cloud Collapse Threshold
- Light Travel Time Calculator: Distance to Time in Light
- Light-Year Calculator: Convert Light-Years to km, Miles, AU
- Luminosity Distance Calculator: Redshift to Distance
- Magnitude-Distance Calculator: Distance Modulus Formula
- Main Sequence Star Lifetime Calculator
- Meteor Observed Rate Calculator: ZHR to Real Count
- Moon Illumination Fraction Calculator
- Moon Phase Calculator: Illuminated Fraction from Synodic Day
- Orbital Eccentricity Calculator 2026: e from Apoapsis and Periapsis
- Orbital Period (Kepler) Calculator 2026: T = 2 pi sqrt(a^3/GM)
- Orbital Period Calculator: Kepler's Third Law
- Orbital Transfer Delta-V Calculator: Hohmann Transfer
- Parallax Calculator: Distance from Stellar Parallax Angle
- Parallax Distance Calculator: d(pc) = 1/p (arcseconds)
- Planetary Escape Velocity Calculator: Mass and Radius
- Planetary Phase Angle Calculator: Illuminated Fraction
- Planetary Surface Gravity Calculator
- Redshift Velocity Calculator: Hubble's Law and Cosmological z
- Rocket Delta-V Calculator: Tsiolkovsky Rocket Equation
- Satellite Orbital Altitude Calculator
- Satellite Orbital Speed Calculator: v = sqrt(GM / r)
- Sidereal Day Calculator
- Sidereal Day Calculator: From Solar Day And Year
- Sidereal Time Calculator: Local Sidereal Time from Date and Longitude
- Solar Declination Calculator
- Solar Flux at Distance Calculator: Inverse Square
- Solar Sun Angle Calculator: Optimal Panel Tilt by Latitude
- Stellar Lifetime Calculator: Main-Sequence Age
- Stellar Luminosity Calculator: Star Power from Radius and Temp
- Surface Brightness Calculator (mag/arcsec2)
- Synodic Period Calculator: Two Orbital Periods
- Telescope Dawes Limit Calculator: Resolving Power
- Telescope Exit Pupil Calculator
- Telescope Exit Pupil Calculator: Eyepiece Pairing
- Telescope Focal Ratio Calculator: f-Ratio and Magnification
- Telescope Limiting Magnitude Calculator
- Telescope Limiting Magnitude Calculator: Faintest Stars
- Telescope Resolving Power Calculator
- Tidal Force Calculator: Differential Gravity
- True Anomaly Calculator: From Eccentric Anomaly
- Twilight Duration Calculator
- Weight on Other Planets Calculator: Gravity by Planet