If I weigh 100 pounds on earth how much would I weigh on space?

In space, weight is determined by gravity, which is significantly weaker than on Earth. If you are in a microgravity environment, such as aboard the International Space Station, you would effectively weigh very little or feel weightless, even though your mass remains the same at 100 pounds. However, if you were far from any gravitational influence, your weight would approach zero.