Bariatric Surgery Weight Loss Calculator (UAE)
Calculate expected weight loss trajectory post-bariatric surgery. Covers Sleeve Gastrectomy (VSG), Roux-en-Y Bypass (RNY), and Duodenal Switch (DS).
Projections Post-Bariatric Surgery
Bariatric surgery (such as Sleeve Gastrectomy or Gastric Bypass) is an effective medical intervention for severe obesity. It restricts food intake and alters metabolic hormones to support weight loss.
Expected weight loss is typically measured as a percentage of Excess Body Weight (EBW). Patients generally lose 50% to 70% of their excess weight within the first 12 to 18 months following the procedure.
This calculator provides estimated weight loss trajectories based on statistical clinical averages. Achieving and maintaining these targets requires strict adherence to dietary guidelines, including high protein intake and lifelong vitamin supplementation.
Frequently Asked Questions
Q: How much weight do you lose after VSG surgery?
On average, patients lose 50% to 60% of their excess body weight within the first year after a Vertical Sleeve Gastrectomy.
Q: What is excess body weight?
Excess body weight is your current weight minus your ideal body weight (based on a healthy BMI of 25).
Medically reviewed by Dr. Rekha Kumar, M.D., M.S. — Lead Medical Reviewer · Last reviewed: September 2026 · Updated: 2026-09-15
Evidence & references
This tool is for informational purposes only and is not a substitute for professional medical advice.
Frequently asked questions
Is this calculator free to use?
Yes. Every calculator on Weight Loss Percentage is free, with no sign-up or account required.
How accurate is the result?
Results depend on the accuracy of what you enter and the published formulas the tool uses, which follow standard guidance from national health authorities. Track the trend over weeks rather than relying on a single reading.
How often should I check it?
Check whenever your weight, activity or goals change — for most people once a week is enough to see a reliable trend.
Who reviews the content on this site?
All medical and nutrition content is written and reviewed by Dr. Rekha Kumar, M.D., M.S., our lead medical reviewer, and cites guidance from U.S. federal health sources such as the CDC and NIH.