[Pounds Lost (8)] x  / [Starting weight (167)] = 4.8
8 pounds is the 4,8% of 167 and that's the % of the weight you have lost.
If you use your current weight like this (8) x (100) / (159) = 5 it would be like saying that you have lost 5% of the 159 pounds that you weigh, which isn't true because you still weigh 159lb. You can't use your current weight, you always have to use the starting weight.
271 Days since: ....Anger Management
Fitness Minutes: (0)
31 2/1/14 6:20 A
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