Most people who ask about body contouring surgery ask too early, and for a large proportion the honest answer is: not yet, and here is why waiting produces a better result.
This topic is also in our free guide, Is Now the Right Time?. Get it emailed to you
This takes about a minute. It does not diagnose anything, it cannot assess whether surgery is suitable for you, and it is not a substitute for a consultation. What it tells you is where you sit on the timeline.
The assessment
This assessment indicates timing only. It does not determine whether any procedure is suitable for you and it is not medical advice. Suitability can only be assessed in person. Dr Rohit Kumar (MED0001630444) Registered medical practitioner, specialist plastic surgeon (specialist registration in surgery – plastic surgery).
Why timing decides everything
Skin continues to retract for months after weight stabilises, and the amount of change in that window is consistently more than people expect. Judging your final shape three months after reaching goal weight gives a pessimistic and inaccurate answer. Twelve months of stable weight gives something close to the real picture.
That is why every question above circles back to stability. It is the one variable that changes whether an assessment is worth having at all.
More on what stability means in practice on keeping the weight off, and on telling skin from remaining fat in fat or loose skin.
Calculators
Five tools, with honest notes on what each one is worth after major weight loss. None of them decides anything — the timing questions above matter more than any number here.
Body mass index
The standard measure, and a blunt one. It says nothing about how much of your weight is muscle, and nothing about loose skin.
Waist-to-hip ratio
A better guide than BMI to where weight is carried, which matters more for health risk.
Measure the waist at its narrowest point and the hips at the widest. After major weight loss, loose skin can distort both — measure without pulling the tape tight.
Daily energy needs
An estimate of what your body uses in a day, using the Mifflin-St Jeor equation.
Estimates run high for people who have lost a large amount of weight, because energy expenditure falls further than the loss of tissue alone accounts for. Treat it as a starting point to adjust from.
Protein target
The number that most affects how much muscle you keep, and therefore how the final result looks.
If you have had bariatric surgery, your own service may set a specific minimum — follow theirs over this. Appetite suppression makes these numbers harder to reach than they look, which is why they need planning rather than intention.
Body fat estimate
Included because it was asked for, with a warning attached.
This is a population formula derived from BMI, and it is unreliable after major weight loss — loose skin weighs something, and the equation counts it as fat. A DEXA scan is the only way to get a figure worth acting on. Do not use this number to make decisions.