📉 Gastric Sleeve Weight Loss Calculator
Estimate your expected excess weight loss trajectory after gastric sleeve (sleeve gastrectomy) surgery based on published average outcomes.
How gastric sleeve weight loss is typically measured
Outcomes after sleeve gastrectomy are usually reported as a percentage of Excess Weight Loss (%EWL) — the difference between your starting weight and an ‘ideal’ weight at a BMI of about 22.5, rather than total body weight lost. Published studies commonly report average %EWL of roughly 35% by 3 months, 55% by 6 months, 65% by 12 months, and up to around 68% by 18 months.
How this calculator works
Enter your current weight and height. The calculator estimates your excess weight against a target BMI of 22.5, then applies typical published %EWL milestones to project weight loss at 3, 6, 12, and 18 months post-surgery.
This is a general educational estimate based on population averages, not a medical prediction for any individual. Actual results vary widely based on surgical technique, diet, exercise, and follow-up care — always follow your bariatric surgical team’s personalized guidance.