On average how much weight in kgs do you lose having a tummy tuck? How many inches do you lose around your stomach area?

An important thing to understand is that for the majority of patient’s a tummy tuck should never be considered a weight loss procedure. A tummy tuck is usually performed to remove excess skin that diet and exercise will not remove. As such, the total weight removal with these procedures is often disappointingly low!
Of course, there exists a group of patients who have large fatty aprons. Obviously, these patients do lose quite a significant amount of weight from the surgery, but these patients represent a very small minority. Furthermore, they are generally not doing the surgery for weight loss, but to reshape the abdomen and create a flatter abdominal contour and remove the functional and lifestyle problems associated with an overhanging fatty apron.

Abdominoplasty is not a weight loss operation.  The average weight of the specimen is 2.5 kg.  Abdominoplasty treats the skin excess and muscle weakness
of the abdomen, as well as any fat that is between the belly button and the
pubic hairline. Liposuction treats only fat. It can be used to thin
out the abdomen, but the skin must be in good condition with no excess, and
there should not be muscle weakness. 

Thank you for the question. As you can imagine, there is no "standard" number of inches or weight lost after surgery given that every patient who undergoes tummy tuck surgery is different. Factors that come into play when it comes to answering your question include: overall body type, degree of muscle separation and adequacy of repair (plication), type of tummy tuck surgery performed, amount of adipose tissue present, quantity/quality of life is such an surgery performed, post operative maintenance of diet/exercise program… My best suggestion: select your plastic surgeon carefully. Ask to see lots of examples of similar patients and evaluate their outcomes. Doing so you may be able to achieve a level of expectation that is realistic.Best wishes.