Does anyone know how to calculate the percentage of excess body fat loss??

Yes but you would need before and after body fat percentage (or in kilos) along with weight, otherwise it's just a guess.

There are some websites where you can enter weight and certain measurements and it gives an guessimate of body fat percentage...you could do for before and after, again not accurate but may be close enough for what you are after.

You'll also need to know the ideal % body fat - will depend on your age and sex. This is a good article on that (based on recommendations of the American College of Sports Medicine). https://www.livestrong.com/article/426250-acsm-body-fat-guidelines/

this article talks about ways to calculate body fat %: https://www.healthline.com/health/how-to-measure-body-fat

I have a scale that calculates body fat % (Fitbit Aria, but there are others).

You'd take (high body fat % - low body fat %)/(ideal body fat %)

How does. realize the used to be Shuttle Bus it was pretty narrow on the lift but I find now there is plenty of room onv5he platform.

And my scale says my body fat % is a little over 30, hope that is a good reading. Love love love seeing. BMI of 31, never thought I could get that low. Hippee Skipper for ME!

Thank you guys ?

I saw once the most simplest way to calculate for woman is 100 pounds at 5 ft and then add 5 pounds for every inch. So at 5'4" my ideal body weight is 120. My weight day of surgery was 202 so I had 82 pounds of excess body weight.