After bariatric surgery your body loses weight in a pattern — face first, hips last, and a curve that's steep, then steady, then flat. Enter your height and weight and this free tool builds your month-by-month timeline: your projected curve, when each part of your body will visibly change, and how many inches come off your waist.
No forms, no email, no account. You type four numbers — the page does the rest, using the same outcome curve as our full weight-loss calculator.
Height, weight, and which procedure you're considering. Waist and hip measurements are optional — add them and the tool projects your inches too.
Your projected plateau weight and BMI, with milestone weights at months 1, 3, 6, 12 and beyond — and where the normal stalls land, so they never scare you.
A personalized bar for every body area — face, belly, chest, arms, hips, legs — showing when each one should visibly change at your pace, plus projected waist & hip inches.
Free · ~60 seconds · nothing you enter is saved
Before we map the order, it helps to know why there is an order. These four findings show up again and again in the research.1–4
"Spot reduction" isn't how fat works. Fat is released from stores all over the body through your bloodstream — exercise for one area doesn't preferentially burn the fat sitting on top of it. Your losing order is set by biology, not by workouts.
Visceral fat — the deep fat packed around your organs — is the most metabolically active, and imaging studies show it shrinks proportionally faster than the fat under your skin, especially in the first months.1 That's a huge health win, even before the mirror catches up.
The areas your body filled out most recently tend to slim down early; the areas that have carried weight the longest are usually the most stubborn. It's why many patients see their face change in weeks — and wait many months for hips and thighs.
Estrogen steers fat toward hips and thighs ("pear"); testosterone steers it toward the belly ("apple"). Lower-body fat cells are biologically more resistant to releasing fat.2 That's genetics and hormones — not willpower.
The fat you can pinch (subcutaneous) and the deep fat packed around your organs (visceral) behave like two different tissues. The deep layer is the one driving diabetes, blood pressure and fatty liver — and it's also the one your body drains first after surgery.1
Testosterone parks fat on the belly (the apple pattern, common in men); estrogen parks it on hips and thighs (the pear, common in women). Belly-first storage sounds unlucky — but belly fat is also the fastest to leave. Hip and thigh fat is chemically wired to hold on.2
Bariatric follow-ups and patient forums have a language of their own. Here's the whole vocabulary lesson, one strip, no jargon.
The deep fat packed around your organs. The most dangerous kind, the most metabolically active — and the first to shrink.
The fat right under your skin — the kind you can pinch. Slower to leave; it's what you actually see change in the mirror.
The difference between your current weight and the top of your healthy BMI range. Surgical results are usually quoted as a % of it.
A one-to-three-week pause on the scale while your body rebalances water and glycogen. Normal. Expected. Temporary.
Your new stable weight, usually reached 12–24 months out. Not a failure — it's the finish line the whole curve points to.
"Non-scale victory" — progress the scale can't see. Looser rings, crossed legs, airplane seatbelts with room to spare, collarbones.
Typical order and timing after gastric sleeve or bypass. Everyone is different — think of this as the most common pattern, not a promise.
Tap a numbered area
Your face will tell the story weeks before your jeans do.
— the pattern nearly every post-op patient recognizesSix stages most patients recognize. The rail on the left shows roughly when each stage becomes noticeable — your calculator result below personalizes these windows.
Both sleeve and bypass follow the same shape: a rapid drop for ~3 months, a steady middle, then a gentle plateau near 12–24 months. Roughly half of your total loss happens in the first six months.3, 4
The steepest loss of the whole journey — many patients lose 1–2 lbs a week or more. Your face and waist usually show it first.
Almost everyone hits a 1–3 week pause early on while the body rebalances water and glycogen. It's expected — the curve resumes.
Loss tapers toward your new stable weight. This is where the stubborn areas (hips, thighs, upper arms) finish their change.
Enter your basics — and, if you want, a tape measurement or two — to see your projected curve, your measurement changes, and when each body area is likely to visibly change for you.
Please enter your height and weight.
Bars show the window when change in each area typically becomes noticeable, scaled to your projected pace.
A coordinator can turn this projection into a plan — free consult, honest answers, no pressure.
These projections are general estimates based on published bariatric outcomes and the numbers you entered — they are not medical advice, a diagnosis, or a guarantee of results. The order and pace of visible change varies widely from person to person. Always consult a qualified surgical team. Nothing you enter is stored.
This page's claims come from peer-reviewed studies and large clinical trials. Plain-language summaries below; talk to your surgical team about how they apply to you.
A systematic review of imaging studies found that during weight loss, visceral adipose tissue shrinks at a proportionally greater rate than subcutaneous fat — especially early and at modest amounts of loss.
Chaston TB, Dixon JB. International Journal of Obesity, 2008.Gluteofemoral ("pear-shape") fat differs from abdominal fat at the cellular level — it is more resistant to lipolysis and is shaped strongly by sex hormones, which is why it tends to change last, particularly in women.
Karastergiou K, et al. "Sex differences in human adipose tissues — the biology of pear shape." Biology of Sex Differences, 2012.In the 5-year SLEEVEPASS randomized trial, weight loss was fastest in the first 6–12 months for both procedures, with average excess weight loss of roughly 49% (sleeve) and 57% (bypass) maintained at 5 years.
Salminen P, et al. JAMA, 2018 (SLEEVEPASS trial).The 5-year SM-BOSS randomized trial found sleeve and bypass produce a similar loss trajectory — a steep first year followed by a long plateau — with average excess-BMI loss of about 61% (sleeve) and 68% (bypass).
Peterli R, et al. JAMA, 2018 (SM-BOSS trial).An international consensus statement recommends tracking waist circumference alongside weight, because shrinking your waist reflects the loss of the visceral fat most tied to diabetes and heart-disease risk.
Ross R, et al. Nature Reviews Endocrinology, 2020.Controlled trials of "spot reduction" — training one limb or one area — consistently find fat loss happens body-wide rather than at the trained site. The losing order is systemic, not local.
e.g. Ramírez-Campillo R, et al. Journal of Strength and Conditioning Research, 2013.