Accurately calculate your weight on the Red Planet based on current physics
Enter your weight as measured on Earth.
Please enter a valid positive number.
Pounds (lbs)
Kilograms (kg)
Stone (st)
Select your preferred unit for display.
Your Weight on Mars
56.6lbs
Based on Martian gravity (3.721 m/s²) being ~37.7% of Earth's.
Weight Difference
-93.4 lbs
Weight on Moon
24.8 lbs
Weight on Jupiter
379.2 lbs
Breakdown of your weight across major solar system bodies based on your input.
Celestial Body
Relative Gravity
Your Weight
What is a Weight on Mars Calculator?
A weight on mars calculator is a specialized educational and scientific tool designed to help users determine how much they—or any object—would weigh on the surface of Mars. While mass remains constant regardless of where you are in the universe, weight is a force derived from the gravitational pull of the planet you are standing on.
This calculator is essential for students, educators, sci-fi enthusiasts, and prospective space travelers who want to understand the physical implications of Martian colonization. Unlike Earth, which has a surface gravity of approximately 9.81 m/s², Mars is a smaller planet with significantly less mass, resulting in a weaker gravitational pull.
Common misconceptions often conflate mass and weight. A user might believe they physically "lose" matter when going to Mars. In reality, your body composition (mass) stays exactly the same; only the downward force exerted by gravity changes.
Weight on Mars Calculator Formula and Math
To accurately calculate weight on Mars, we use Newton's law of universal gravitation concepts adapted for surface gravity comparisons. The core formula used by this calculator is a ratio comparison between Earth's gravity and Mars' gravity.
Formula: WMars = WEarth × (gMars / gEarth)
Where:
WMars is the resulting weight on Mars.
WEarth is the input weight on Earth.
gMars is the gravity of Mars (~3.721 m/s²).
gEarth is the gravity of Earth (~9.807 m/s²).
The ratio (gMars / gEarth) equates to approximately 0.377 (or 37.7%). This means you weigh roughly 37.7% of your Earth weight when you are on the Red Planet.
Variable
Meaning
Unit
Typical Value (Earth)
W
Weight (Force)
Newtons / lbs / kg-force
User Input
m
Mass
Kilograms (kg)
Constant
g
Acceleration due to Gravity
m/s²
9.81 m/s²
Practical Examples
Example 1: The Astronaut
Scenario: An astronaut weighs 180 lbs on Earth and wants to know their functional weight on Mars to calibrate their spacesuit mobility.
Input: 180 lbs
Calculation: 180 × 0.377 = 67.86 lbs
Interpretation: On Mars, the astronaut feels significantly lighter. Movement that requires heavy exertion on Earth (like doing a pushup) becomes much easier. However, the mass (inertia) remains the same, so stopping a moving object still requires the same effort.
Example 2: The Mars Rover
Scenario: An engineer is designing a rover that weighs 900 kg on Earth.
Input: 900 kg
Calculation: 900 × 0.377 = 339.3 kg
Interpretation: The suspension system of the rover only needs to support the equivalent of 339.3 kg of force. This allows engineers to use lighter materials for the landing gear compared to a vehicle designed for Earth use.
How to Use This Weight on Mars Calculator
Enter Your Weight: Locate the "Your Earth Weight" field and input your current weight.
Select Unit: Use the dropdown menu to toggle between Pounds (lbs), Kilograms (kg), or Stone. The math adjusts automatically.
Review the Primary Result: The large number at the top of the results section shows your exact weight on Mars.
Check Intermediates: Look at the grid below to see how much weight you "lost" (the difference) and how you would weigh on other bodies like the Moon or Jupiter for context.
Analyze the Chart: The visual bar chart provides a quick scale comparison of gravity across the solar system relative to your input.
Key Factors That Affect Weight on Mars Results
While the weight on mars calculator provides a standard estimate, several factors influence the precise physics of weight on another planet.
Gravitational Constant: The standard gravity on Mars is 3.721 m/s², but this is an average. Mars is not a perfect sphere; it bulges at the equator, causing slight variations in gravity.
Altitude: Just like on Earth, gravity weakens as you move further from the center of mass. Standing on top of Olympus Mons (the highest volcano in the solar system) would result in a slightly lower weight than standing in a deep valley like Valles Marineris.
Local Density: Variations in the density of the Martian crust (mascons) can cause local gravitational anomalies, affecting sensitive scientific weight measurements.
Centrifugal Force: Mars rotates on its axis. At the Martian equator, the centrifugal force counteracts gravity slightly more than at the poles, theoretically reducing measured weight by a tiny fraction.
Atmospheric Buoyancy: On Earth, the atmosphere provides a tiny buoyant force that slightly reduces measured weight. Mars has a very thin atmosphere (about 1% of Earth's), so this buoyant effect is negligible, making your "true" weight slightly more accurate to the raw gravitational pull.
Mass Consistency: It is crucial to remember that while weight changes due to gravity, mass—the amount of matter in your body—affects momentum and kinetic energy. If you run into a wall on Mars, it hurts just as much as on Earth because your mass has not changed.
Frequently Asked Questions (FAQ)
Is the weight on Mars calculator 100% accurate?
It is accurate for standard surface gravity approximations. Real-world variations due to altitude and local geology on Mars are less than 1%, making this tool perfectly suitable for general planning and education.
Will I lose weight if I move to Mars?
You will lose weight (the force on the scale), but you will not lose mass (your body fat and muscle). You would look the same, but you would feel lighter and be able to jump higher.
Does this calculator work for objects other than humans?
Yes. You can enter the weight of a car, a building, or a pet. The physics of gravity applies universally to all matter.
Why is gravity lower on Mars?
Mars is smaller than Earth (about half the diameter) and has less density. This results in less total mass, which generates a weaker gravitational field compared to Earth.
What is the gravity on Mars compared to Earth?
Mars gravity is approximately 38% of Earth's gravity. Specifically, the ratio is 0.377.
Does air pressure affect my weight on Mars?
Negligibly. The thin atmosphere means there is almost no buoyancy, so a scale on Mars measures your weight almost purely based on gravity.
Can I use this for Stone (st) measurements?
Yes, our calculator supports pounds, kilograms, and stone. Select "Stone" in the unit dropdown to see the conversion.
How does Mars gravity compare to the Moon?
Mars has roughly double the gravity of the Moon. While you would feel light on Mars, you would not "float" or bounce quite as slowly as astronauts did on the Moon.
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