Earth & Space Calculator
Fun astronomy calculators: planetary weight, travel time, age on other planets, and more.
About this tool
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.
How to use
- 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.
Frequently Asked Questions
Solve common physics problems with step-by-step solutions.
Convert between metric and imperial units — length, weight, temperature, area, volume.
Full scientific calculator with trig, logarithms, powers, and history — runs entirely in your browser.
Solve for speed, distance, or time given the other two values with automatic unit conversion.