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35 tools
Use our escape velocity calculator to find out the speed required to leave the surface of any planet.
If you want to calculate the force between two masses, try our gravitational force calculator.
Our light year conversion tool allows you to convert light years into different-length units. Figure out how far light will travel in a given light year.
Use our orbital velocity calculator to estimate the parameters of orbital motion of the planets.
The alien civilization calculator explores the existence of extraterrestrial civilizations by comparing two models: the Drake equation and the Astrobiological Copernican Limits👽
The angular resolution calculator finds out the angular resolution of a lens.
The Black Hole Collision Calculator lets you see the effects of a black hole collision, as well as revealing some of the mysteries of black holes, come on in and enjoy!
Use the black hole temperature calculator to learn the black body temperature of a black hole from just its mass.
Calculate your cosmic velocity with our free online tool. Get accurate results instantly. No signup required.
How much speed do you need to move in space? Find it out with our delta-v calculator!
Learn the geometry of horizons with our distance to the horizon calculator: on Earth or anywhere else in the Solar System!
Where is everybody? Learn how to calculate the probability of another civilization existing somewhere in our Galaxy with Omni's Drake equation calculator.
The Earth curvature calculator lets you find the distance from you to the horizon, as well as the height of an object that is partially hidden behind it.
This Earth orbit calculator determines the speed and orbital period of a satellite at a given height above average Earth sea level.
The exoplanet discovery calculator allows you to play around and discover the calculations that got a Nobel Prize in 2019 for the discovery of planets outside the solar system.
The exoplanet travel planner will help you plan your next trip to a foreign planet including food, water, expected exploration time...
Omni's not-flat Earth calculator helps you perform three experiments that prove the world is round.
With this gravitational time dilation calculator you can check how much time slows down by near big objects.
Convert gravity moon acceleration values instantly with our free tool. Get accurate results with clear explanations.
Convert gravity sun acceleration values instantly with our free tool. Get accurate results with clear explanations.
Hohmann transfer calculator lets you find the best fuel-efficient transfers between two circular orbits.
Come on into the Hubble law distance calculator where you can find the answers for the questions like what is the Hubble's Law and what is the value of the Hubble constant.
Use this Kepler's third law calculator to find the relationship between a planet's orbital period and it semi-major axis (or mean orbital radius).
The luminosity calculator finds a star's luminosity, absolute magnitude, and apparent magnitude.