How do I calculate how many Weight Watchers points I can eat?

I am trying to start weight watchers but cannot afford it! I need to know how to calculate my points allowance per day. I found one post on here that helped, but didn't tell me the weight of a "stone" to finish the calculation! So please, if someone can give me the complete calculation formula, I... show more I am trying to start weight watchers but cannot afford it! I need to know how to calculate my points allowance per day. I found one post on here that helped, but didn't tell me the weight of a "stone" to finish the calculation! So please, if someone can give me the complete calculation formula, I would appreciate it!
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