In simple terms, the mass of a body is the amount of matter it contains. Any body with mass has a quality known as inertia. Inertia of a body is the physical force that keeps the body at rest or in motion.
Weight is a different concept. Weight of a body can be described as the result of a force of attraction of one body on another. Every body, howsoever small or big, exerts a force of attraction on another body nearest to it. The amount of attraction varies with the sizes of the bodies and the distance they are apart. Thus, a larger body exerts a greater pull on a smaller body. And, the pull of body is greater on a nearer object than on a farther one. In order to easily and effectively measure the pull (force of attraction) of one body by another, the sizes of the bodies need to be very small and very large, such as you and the Earth.
Therefore, while mass is the quantity of matter and is constant for a given body, the weight of the same body varies depending on the pull it suffers. Thus, your weight on Jupiter is much more than you weigh here on the Earth.
The following table helps you to calculate your weight (in any unit) on different planets:
Earth = W
Mercury = W x 0.38
Venus = W x 0.91
Moon = W x 0.16
Mars = W x 0.38
Jupiter = W x 2.54
Saturn = W x 0.93
Uranus = W x 0.8
Neptune = W x 1.2
Pluto = W x 0.067
The Sun = W x 28
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