• Sarah Caughron

What is your weight in space?

Updated: Mar 19, 2020

Looking for a fun math activity?

I love doing calculations with my 2nd grader to determine our weights in space!

He's not really doing much multiplication yet, but it is still fun to see how much his weight changes when there is more or less surface gravity!

Weight on other planets is the result of your mass, the size of the planet, and strength of the surface gravity on each planet. One's mass won't change on other planets, but the surface gravity and the size of each planet (or moon) does affect weight. (Think about how high an astronaut can jump on the moon, for example!)

Calculate weight on other planets by multiplying your mass (weight on earth) by the surface gravity at each planet. Make a table of this data and compare how much gravity impacts how much, or even how little, you weigh on each planet!

Since we are dealing with science, let's use the metric system, so the first step in this process is to convert our weight to KG.

1 pound = 2.2 kg

Divide your weight/mass by 2.2.

Example: 25lbs = _______ kg?

25/2.2 = 11.36kg

We only need a 2 digit number, you can round to a final answer of 11kg.


Mercury: 0.38g

Venus: 0.91g

Earth: 1.0g

Mars: 0.38g

Jupiter: 2.34g

Saturn: 0.93g

Uranus: 0.92g

Neptune: 1.12g

Earth's Moon: 0.166g

Weight = Mass (in KG) x Surface Gravity (g)

Example: 11kg on Earth = 25.7kg on Jupiter! (Rounded to 26)

Then, you can convert back to pounds by multiplying the weight by 2.2.

26kg = 57.2 lbs on Jupiter!

After you calculate all of the weights, Google search a comparison of planet sizes so you can see how weight changes on large or small planets, respectively.

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