Light Travel Time Calculator
Calculate how long light takes to cross a distance in space.
THE SPACE COLLECTION
Space Calculators
Explore planetary motion, gravity, orbits, stars and astronomical distances.
40 calculators · 6 topics
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Explore SpaceOrbital Period Calculator
Estimate the period of a circular orbit around an Earth-scaled body.
Escape Velocity Calculator
Estimate surface escape velocity from mass and radius relative to Earth.
Age on Mercury Calculator
Convert your Earth age into Mercury years.
Astronomical Unit Converter
Convert astronomical units into kilometres and light-travel time.
Find the right tool
40 calculatorsPlanet Travel
9 calculatorsSpacecraft Travel Time Calculator
Estimate travel time from distance and spacecraft speed.
Travel to Jupiter Calculator
Estimate how long it would take to reach Jupiter at different straight-line distances and travel speeds.
Travel to Mars Calculator
Estimate how long it would take to reach Mars at different straight-line distances and travel speeds.
Travel to Pluto Calculator
Estimate how long it would take to reach Pluto at different straight-line distances and travel speeds.
Travel to Saturn Calculator
Estimate how long it would take to reach Saturn at different straight-line distances and travel speeds.
Travel to the Moon Calculator
Estimate how long it would take to reach the Moon at different straight-line distances and travel speeds.
Travel to the Sun Calculator
Estimate how long it would take to reach the Sun at different straight-line distances and travel speeds.
Travel to Venus Calculator
Estimate how long it would take to reach Venus at different straight-line distances and travel speeds.
Life on Other Worlds
14 calculatorsAge on Every Planet Calculator
See your age in Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune years.
Age on Jupiter Calculator
Convert your Earth age into Jupiter years.
Age on Mars Calculator
Convert your Earth age into Mars years.
Age on Mercury Calculator
Convert your Earth age into Mercury years.
Age on Neptune Calculator
Convert your Earth age into Neptune years.
Age on Saturn Calculator
Convert your Earth age into Saturn years.
Age on Uranus Calculator
Convert your Earth age into Uranus years.
Age on Venus Calculator
Convert your Earth age into Venus years.
Weight on Every Planet Calculator
Compare your Earth scale reading across the Moon and all eight planets.
Weight on Jupiter Calculator
Compare an Earth scale reading with the equivalent surface-gravity reading on Jupiter.
Weight on Mars Calculator
Compare an Earth scale reading with the equivalent surface-gravity reading on Mars.
Weight on Saturn Calculator
Compare an Earth scale reading with the equivalent surface-gravity reading on Saturn.
Weight on The Moon Calculator
Compare an Earth scale reading with the equivalent surface-gravity reading on the Moon.
Weight on Venus Calculator
Compare an Earth scale reading with the equivalent surface-gravity reading on Venus.
Planet Science
5 calculatorsPlanet Day Length Calculator
Compare the approximate sidereal rotation period of the eight planets.
Planet Density Calculator
Estimate average planetary density from mass and radius relative to Earth.
Planet Surface Gravity Calculator
Estimate surface gravity from a planet’s mass and radius relative to Earth.
Planet Volume vs Earth Calculator
Estimate how many Earth volumes fit inside a spherical planet from its radius ratio.
Planet Year Length Calculator
Compare the orbital year length of the eight planets.
Astronomy Tools
5 calculatorsAstronomical Unit Converter
Convert astronomical units into kilometres and light-travel time.
Light-Year Converter
Convert light-years into kilometres, astronomical units and parsecs.
Parsec Converter
Convert parsecs into light-years, astronomical units and kilometres.
Telescope Field of View Calculator
Estimate true field of view from eyepiece apparent field and magnification.
Telescope Magnification Calculator
Calculate telescope magnification from telescope and eyepiece focal lengths.
Orbits, Stars & Black Holes
6 calculatorsEscape Velocity Calculator
Estimate surface escape velocity from mass and radius relative to Earth.
Meteor Impact Energy Calculator
Estimate kinetic energy for an incoming meteoroid from mass and speed.
Orbital Period Calculator
Estimate the period of a circular orbit around an Earth-scaled body.
Orbital Speed Calculator
Estimate circular orbital speed at a chosen altitude around an Earth-scaled body.
Schwarzschild Radius Calculator
Calculate the Schwarzschild radius of a non-rotating black hole from its mass.
Star Luminosity Calculator
Estimate stellar luminosity from radius and temperature relative to the Sun.
More Space Calculators
1 calculatorsSpaceX Mission Duration Calculator
Explore launch, booster landing and spacecraft return times using published mission records.
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