Astronomy calculators
15 calculators Escape Velocity Calculator Find escape velocity from any planet, moon or star with v = sqrt(2GM/r). Get orbital velocity, surface gravity and mph, switch units, or reverse solve for mass.
Open Orbital Velocity Calculator Find orbital velocity for circular or elliptical orbits from central mass and radius or a planet preset. Get period, escape velocity and energy with steps.
Open Alien Civilization Calculator Estimate how many alien civilizations exist using the Drake Equation or Copernican model. Get nearest distance, detection probability, and a full worked breakdown.
Open Delta-V Calculator Rocket delta-v calculator using the Tsiolkovsky equation. Solve for delta-v, dry mass, wet mass, or Isp. Propellant presets and common mission delta-v reference table.
Open Earth Orbit Calculator Calculate orbital speed, period, angular velocity, and escape velocity for any Earth orbit altitude. Metric and imperial units with step-by-step math shown.
Open Exoplanet Discovery Calculator: Transit, Radial Velocity, Habitable Zone Calculate exoplanet properties using transit depth, radial velocity, Kepler orbital period, equilibrium temperature, and habitable zone. Step-by-step math included.
Open Hohmann Transfer Calculator Calculate the two delta-v burns, transfer orbit properties, time of flight, and propellant mass for a Hohmann orbital transfer between any two circular orbits.
Open Kepler's Third Law Calculator Calculate orbital period, semi-major axis, or central body mass using Kepler's third law. Solve any direction, with worked steps and a planet comparison table.
Open Orbital Period Calculator Calculate orbital period, semi-major axis, or central body mass using Kepler's Third Law. Supports satellites, binary stars, planets, and moons with full unit control.
Open Rocket Equation Calculator Calculate delta-v, mass ratio, propellant mass, or initial mass with the Tsiolkovsky rocket equation, including propellant presets and mission reference budgets.
Open Rocket Thrust Calculator Calculate rocket thrust using F = mdot x ve + Ae(Pe - Pamb). Get momentum thrust, pressure thrust, specific impulse, and thrust-to-weight ratio instantly.
Open Specific Impulse Calculator Calculate rocket specific impulse (Isp), exhaust velocity, thrust, mass flow, and delta-v with the Tsiolkovsky equation, across chemical, ion, and nuclear propulsion.
Open Synodic Period Calculator: Planetary Conjunctions and Oppositions Calculate the synodic period of any planet or moon from two sidereal orbital periods. Solar system presets, worked steps, and a full planetary reference table included.
Open Thrust to Weight Ratio Calculator Calculate thrust-to-weight ratio (TWR) for rockets, aircraft, and drones. Solve for TWR, required thrust, max mass, or net acceleration. Vehicle presets included.
Open UFO Travel Calculator Calculate UFO travel time, Lorentz factor, relativistic time dilation, and kinetic energy for any interstellar distance. Also compare atmospheric city-to-city speeds.
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