What would be the mathematical formula to figure out a person's weight on a world bigger or smaller than Earth?

Okay, trying to figure out this math guys! This may be simple math to some of you, but not me!!!

I googled various ways of asking this question and got some good results, but I'm looking for a simple formula to use.

If I weigh 200 pounds on Earth, how much would I weigh on a planet that's 90% smaller than the Earth, or how much would I weigh on a planet that's 25% bigger than the Earth. (I don't know the MASS of the moons/planets)

Can you tell me the mathematical formula to figure this out so I can change the weight of person/object and see what they would weigh on other moons/planets (without knowing the MASS of those objects)?

I found this Weight = Mass x Surface Gravity but what if I don't know Mass or I don't know Gravity? I just know smaller/bigger? Not possible?

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What would be the mathematical formula to figure out a person's weight on a world bigger or smaller than Earth?

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