Estimate Your Expected Weight Loss After Surgery
Use this tool to estimate your potential weight loss following bariatric surgery. Results are based on published clinical data from the Michigan Bariatric Surgery Collaborative registry and peer-reviewed outcomes research. Enter your current information below to receive a personalized projection.
This tool uses published clinical benchmarks for percent excess weight loss (%EWL) based on procedure type and post-operative timeframe. Excess weight is defined as the difference between your current weight and your ideal body weight at a BMI of 25.
The expected %EWL ranges used in this calculator are derived from large-scale outcomes data, including the MBSC registry and published meta-analyses:
Expected excess weight loss of 50-60% at 6 months, 55-70% at 12 months, and 55-65% at 24 months. The sleeve gastrectomy is the most commonly performed bariatric procedure in the United States, accounting for approximately 60% of all weight loss surgeries.
Expected excess weight loss of 55-70% at 6 months, 65-80% at 12 months, and 60-75% at 24 months. Gastric bypass combines restriction with mild malabsorption and is particularly effective for patients with type 2 diabetes and gastroesophageal reflux disease.
Expected excess weight loss of 60-75% at 6 months, 70-85% at 12 months, and 70-80% at 24 months. The BPD/DS produces the greatest weight loss among standard bariatric procedures but carries higher risk of nutritional deficiencies and is typically reserved for patients with BMI of 50 or above.
While this calculator provides a useful estimate, actual weight loss outcomes depend on many individual factors:
This calculator is intended for informational and educational purposes only. It does not constitute medical advice and should not be used as a substitute for consultation with a qualified bariatric surgeon or healthcare provider. Actual outcomes vary based on individual health factors, surgical technique, and post-operative adherence to lifestyle modifications.
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