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This is VERY rough figuring. One source says 1 liter of helium can lift 1 gram. Translating to the other measurement system, you get 1 gram = .0022 pounds 200 pounds = about 91,000 grams 1 liter = .035314 cubic feet 91,000 times .035314 cubic feet = about 3214 cubic feet. Thus, not counting the weight of the balloon (or whatever is holding the helium), it would take more than 3,000 cubic feet of helium to lift a 200-pound person off the ground.
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