Space & Astronomy Calculators

Put the solar system into numbers you can feel: how long a road trip to Mars would take, what you'd weigh on Jupiter, how fast the ISS laps the Earth, and how long light needs to reach us. Every calculator shows its working from real published values — drag the inputs and watch the scale of space change.

• Space Travel Time CalculatorHow long would it take to reach the Moon, Mars or Neptune — by car, by rocket, or at Voyager speed?
• Weight on Other Planets CalculatorWhat would you weigh on the Moon, Mars or Jupiter? Your weight scaled by each world's surface gravity.
• Age on Other Planets CalculatorHow old would you be in Mercury years or Mars years? Your age converted to another planet's trips around the Sun.
• Orbital Period Calculator (Earth Satellites)How long a satellite takes to circle the Earth, from its altitude — the ISS laps the planet in about 93 minutes.
• Escape Velocity CalculatorThe speed needed to break free of a world's gravity, from its mass and radius — in Earth units, so any planet works.
• Light Travel Time CalculatorHow long light takes to cross space — 1.3 seconds to the Moon, 8 minutes from the Sun, 4 years from the nearest star.
• Telescope Magnification CalculatorMagnification and true field of view from your telescope's focal length and any eyepiece.
• Distance Between Planets CalculatorHow close two planets get and how far apart they can be, from their average distances to the Sun.
• 1g Space Travel CalculatorHow fast you'd cross the solar system accelerating at 1g the whole way — Mars in two days, with Earth-like gravity aboard.