To calculate weight loss percentage is a pretty basic formula. First of all you’ll need to remember your initial weight.
Secondly, you’ll need your actual weight at this point.
Now, the formula goes like this:
((IW-AW)/IW) * 100= weight loss percentage
In this formula IW is your initial weight and AW is your actual weight at this point. All you do is subtract the actual weight from the initial weight and divide the number obtained by your initial weight. Multiply the result with 100 and you’ll get the exact percent."