Question 1

How do you calculate weight on another planet?

Accepted Answer

Weight = mass x local gravity. Multiply your Earth mass by the planet's surface gravity to get weight there.

Question 2

What is the difference between mass and weight?

Accepted Answer

Mass is the amount of matter and stays the same everywhere; weight is the force due to gravity and changes with location.

Question 3

Do I need my mass or Earth weight?

Accepted Answer

You can convert Earth weight (N or lb) to mass, then multiply by other gravity; or use gravity ratios relative to Earth.

Question 4

Why does the Moon weight less than on Earth?

Accepted Answer

The Moon's gravity is about 0.165 g of Earth's, so weight is roughly one-sixth.

Question 5

Does altitude change weight?

Accepted Answer

Slightly—gravity decreases with altitude, but the change is small at typical elevations.

Space Weight Calculator