How is weight on other planets calculated?

Each planet has a surface gravity relative to Earth's 9.81 m/s². Your weight is multiplied by that planet's gravity ratio.

What distances are used for travel time?

Average orbital distances from the Sun are used. Actual distances vary significantly depending on where each planet is in its orbit.

How does the planet age calculator work?

Each planet has a different orbital period (year length). Your age in Earth years is divided by the planet's year length to find your age there.

How many Earths fit in the Sun?

About 1.3 million Earths fit inside the Sun by volume. The visual SVG comparison shows the relative sizes of Earth and the Sun.

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Earth & Space Calculator

Fun astronomy calculators: planetary weight, travel time, age on other planets, and more.

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Sobre esta ferramenta

Explore the cosmos with interactive astronomy and earth science calculators. Find your weight on any planet in the solar system, calculate travel time to each planet by car, airplane, rocket, or at light speed, convert light-years to km and miles, discover your age in other planet years, see how far light travels in any number of seconds, and visualize how many Earths fit inside the Sun with an SVG size comparison. All planetary distances are based on average orbital data.

Como usar

1 Select a calculator tab: Weight, Travel Time, Light-Year, Planet Age, or Size Comparison.
2 Enter the required value (e.g., your weight in kg or lbs).
3 View results for all planets simultaneously.
4 For travel time, choose your travel speed (car, plane, rocket, or light).
5 Use the SVG size comparison to visualize Earth vs the Sun.

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