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seaneshbaugh/desired_weight.rb

Created February 16, 2016 16:50
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Calculate desired weight based on body fat percentages
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desired_weight.rb
def desired_weight(current_weight, current_body_fat_percentage, desired_body_fat_percentage)
raise ArgumentError if current_weight < 0
raise ArgumentError if current_body_fat_percentage < 0
raise ArgumentError if current_body_fat_percentage > 100
raise ArgumentError if desired_body_fat_percentage < 0
raise ArgumentError if desired_body_fat_percentage > 100
current_weight = current_weight.to_f
current_body_fat_percentage = current_body_fat_percentage.to_f / 100.0
desired_body_fat_percentage = desired_body_fat_percentage.to_f / 100.0
lean_weight = current_weight - (current_weight * current_body_fat_percentage)
(lean_weight / (1.0 - desired_body_fat_percentage)).round(1)
end
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