Instantly determine how much you would weigh on Mars, Jupiter, the Moon, and other celestial bodies.
Enter your current weight.
Please enter a valid positive number.
Pounds (lbs)
Kilograms (kg)
Stone (st)
Select the unit you use on Earth.
The Moon (0.166g)
Mercury (0.38g)
Venus (0.91g)
Mars (0.38g)
Jupiter (2.34g)
Saturn (1.06g)
Uranus (0.92g)
Neptune (1.19g)
Pluto (0.06g)
The Sun (27.9g)
Choose a specific celestial body to highlight.
Weight on The Moon
24.9 lbs
Gravity Ratio
0.166x
Weight Difference
-125.1 lbs
Mass (Invariant)
68.0 kg
Formula Used:WeightPlanet = WeightEarth × (GravityPlanet / GravityEarth)
Figure 1: Comparative weight analysis across the solar system.
Celestial Body
Gravity Factor
Resulting Weight
Table 1: Detailed breakdown of gravitational effects by planet.
What is "Calculate Weight on Other Planets"?
When people seek to calculate weight on other planets, they are essentially looking to understand how the force of gravity changes depending on where they are in the universe. While we often use the terms "mass" and "weight" interchangeably in daily conversation, they mean very different things in physics. This distinction is the core concept behind any planetary weight calculator.
This tool is designed for students, astronomy enthusiasts, and educators who need to visualize the effects of varying gravitational fields. By using this tool to calculate weight on other planets, you can instantly see that while you might feel heavy on Earth, you would feel incredibly light on the Moon or crushingly heavy on Jupiter.
A common misconception is that your body changes when you travel to another planet. In reality, the amount of matter in your body (your mass) remains constant. Only the force pulling you down (your weight) changes. This calculator helps quantify that specific force change.
The Formula for Planetary Weight
To accurately calculate weight on other planets, we use a straightforward derivation of Newton's Law of Universal Gravitation. The calculation relies on comparing the surface gravity of the target planet to the surface gravity of Earth.
The mathematical formula is:
WeightPlanet = WeightEarth × (gPlanet / gEarth)
Where g represents the acceleration due to gravity. Since we often express the gravity of other planets as a ratio relative to Earth (where Earth = 1.0), the formula simplifies to multiplying your Earth weight by the planet's gravity factor.
Table 2: Variable definitions for the weight calculation formula.
Variable
Meaning
Unit
Typical Earth Value
WEarth
Input Weight
lbs, kg, st
User Defined
gRelative
Gravity Factor
Ratio (Dimensionless)
1.0
Mass
Quantity of Matter
kg
Constant anywhere
Practical Examples (Real-World Use Cases)
Example 1: The Martian Astronaut
Imagine an astronaut preparing for a mission to Mars. They weigh 180 lbs on Earth with their flight suit on. They need to calculate weight on other planets to design their equipment suspension systems.
Input: 180 lbs
Target: Mars (Gravity Factor ~0.38)
Calculation: 180 × 0.38 = 68.4
Result: On Mars, the astronaut weighs only 68.4 lbs. This means they can carry much heavier life-support packs than they could on Earth without fatigue.
Example 2: The Jovian Probe
A scientific probe is designed to descend into Jupiter's atmosphere. The probe has a mass that equates to a weight of 1,000 kg on Earth. Engineers must calculate weight on other planets to ensure the parachute can deploy.
Input: 1,000 kg
Target: Jupiter (Gravity Factor ~2.34)
Calculation: 1,000 × 2.34 = 2,340
Result: On Jupiter, the probe effectively weighs 2,340 kg. The structural integrity must be reinforced to handle more than double the stress experienced on Earth.
How to Use This Calculator
We have designed this tool to be the most efficient way to calculate weight on other planets. Follow these simple steps:
Enter Your Weight: Input your current weight in the "Weight on Earth" field. Ensure you use a valid number.
Select Unit: Choose between Pounds (lbs), Kilograms (kg), or Stone (st). The calculator adjusts labels automatically.
Choose Highlight Planet: Select a specific planet (like Mars or the Moon) to see a detailed breakdown in the highlighted result box.
Analyze the Data: Review the dynamic bar chart to visualize the differences and check the data table for a complete solar system overview.
Use the "Copy Results" button to save the data to your clipboard for reports or homework assignments.
Key Factors That Affect Weight Calculation
When you calculate weight on other planets, several physical factors influence the final number. It is not just random; it is determined by the celestial mechanics of the body you are standing on.
Planet Mass: The more massive a planet is, the stronger its gravitational pull. Jupiter is massive, hence the high weight.
Planet Radius: Gravity weakens with distance. A planet with a large radius might have lower surface gravity than expected because the surface is far from the center of mass (e.g., Saturn vs. Earth).
Density: A small but dense planet can have higher gravity than a large, fluffy gas giant.
Rotation Speed: Rapid rotation (centrifugal force) can slightly counteract gravity at the equator, reducing effective weight.
Altitude: Standing on a mountain on Mars would result in slightly less weight than standing in a valley, as you are further from the center.
Local Anomalies: Variations in crust density can cause minor fluctuations in gravity (and thus weight) at specific locations on a planet.
Frequently Asked Questions (FAQ)
Why is my mass different from my weight?
Mass is the amount of matter in you (atoms and molecules), measured in kg. Weight is the force of gravity acting on that mass. When you calculate weight on other planets, your mass stays the same, but the force changes.
What is the gravity factor of Pluto?
Pluto is very small. Its gravity factor is approximately 0.06. A 100lb person would weigh only 6 lbs on Pluto.
Would I be crushed on the Sun?
Yes. If you could stand on the Sun's "surface" without burning, the gravity is about 28 times stronger than Earth's. You would weigh thousands of pounds instantly.
Does this calculator include gas giants?
Yes. However, keep in mind gas giants like Jupiter and Saturn do not have a solid surface. The calculation assumes weight at the cloud tops where pressure equals 1 bar (Earth sea level pressure).
Can I calculate weight for the Moon?
Absolutely. The Moon is included in the dropdown menu. It has roughly 1/6th of Earth's gravity.
Why is Saturn's gravity similar to Earth's?
Although Saturn is massive, it is also very large (wide radius) and made mostly of light gas. This low density means the surface gravity is only slightly higher (1.06x) than Earth's.
Is the formula accurate for all objects?
Yes, the formula applies to any object, vehicle, or person. You just need the Earth weight to start the calculation.
How do I convert Kilograms to Mass?
In physics, Kilograms are already a unit of mass. However, in daily use, we treat them as weight. On Earth, 1 kg of mass weighs about 9.8 Newtons, or 2.2 lbs.
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