Astronomy Calculators
Explore celestial measurements, planetary motion, and astronomical phenomena. Calculate orbital mechanics, stellar brightness, and cosmic distances.
View our calculators
AU to km Astronomical Unit Converter
Convert astronomical units (AU) to kilometers, miles, light-years, and parsecs. Enter any distance to compare solar system and space scales.
Light Year Distance Calculator
Convert between light-years, parsecs, astronomical units, and conventional measures. Calculate vast cosmic distances for astronomy research, space exploration planning, and understanding the scale of the universe.
Moon Phase Calculator
Find today's moon phase or calculate lunar phases for any past or future date. Check new moon, full moon, illumination, age, and monthly cycles.
Orbital Period Calculator
Calculate orbital period from orbital size and central mass using the standard gravitational formula for astronomy and physics problems.
Planetary Weight Calculator
Compare your Earth weight with your weight on planets, moons, and other bodies using surface gravity and simple conversion formulas.
Star Magnitude Calculator
Calculate star magnitude, distance modulus, and brightness ratios. Convert apparent and absolute magnitude for astronomy planning.
Stellar Temperature Calculator
Estimate stellar temperature from color or spectral class. Compare star temperature, color, and classification for astronomy calculations.
Telescope Magnification Calculator
Calculate the magnification of telescopes with different eyepieces. Determine optimal magnification for various astronomical targets, exit pupil size, field of view, and maximum usable magnification based on aperture.
