Gastric Sleeve Weight Loss Calculator
What Is Gastric Sleeve Surgery?
Gastric sleeve surgery (also called sleeve gastrectomy) is a type of bariatric surgery that removes about 75–80% of your stomach. This reduces appetite and food intake, helping people with morbid obesity achieve sustainable weight loss. It’s one of the most common procedures globally and is typically recommended for individuals with a BMI ≥ 35.
How Our Weight Loss Calculator Works
This gastric sleeve weight loss calculator uses averages from published medical studies and clinical case data. You enter your:
- Pre-surgery weight and height (to calculate BMI)
- Age and gender
- Type of surgery (sleeve, bypass, duodenal switch, lap band)
It then estimates your expected weight loss percentage and total pounds lost over time — from 3 months up to 12 months post-op.
Expected Weight Loss by Procedure
| Procedure | Expected Weight Loss (% Excess Weight) |
|---|---|
| Sleeve Gastrectomy | 60–70% |
| Gastric Bypass (Roux-en-Y) | 65–80% |
| Duodenal Switch (DS) | 75–90% |
| Lap Band | 40–50% |
| Gastric Balloon | 25–30% |
Source: National Library of Medicine, ASMBS Guidelines
12-Month Weight Loss Example
For a patient who is 5’6″ (167 cm) and weighs 290 lbs before surgery:
- BMI: ~47.0 (classified as morbidly obese)
- Excess weight: 130 lbs (based on ideal BMI of 24.9)
- Sleeve Gastrectomy result (70% EW loss): ~91 lbs lost
- Estimated weight after 12 months: ~199 lbs
Factors That Influence Weight Loss Results
- Type of bariatric surgery performed
- Post-operative diet & exercise adherence
- Age, gender, and metabolic rate
- Hormonal balance and pre-existing conditions (e.g. type 2 diabetes)
Is Gastric Sleeve Right for Me?
- Have a BMI over 35 with comorbidities (or BMI ≥ 40 alone)
- Have tried diet, exercise, and medications without success
- Are prepared to follow a strict post-surgery lifestyle plan
Always consult with a bariatric surgeon and registered dietitian before making decisions.
Frequently Asked Questions
How much weight will I lose after gastric sleeve?
Most patients lose 60–70% of their excess weight over 12–18 months.
How soon will I see results?
Weight loss is most rapid in the first 3–6 months. Expect gradual results through the first year.
What’s the difference between gastric sleeve and bypass?
Sleeve is restrictive only; bypass also changes absorption. Bypass usually leads to faster weight loss but with more nutrient risks.
Reviewed by Medical Expert
Dr. Amanda Liu, MD, FACS – Board-Certified Bariatric Surgeon with 10+ years of clinical experience in metabolic weight loss surgery.
Disclaimer: This tool provides general estimates and is not a substitute for medical evaluation. Always consult a qualified health provider before deciding on surgery.
Post-Surgery Planning
🎯 Plan Your Post-Surgery Diet
Use the Weight Gain Calculator to manage your nutritional needs and track your recovery after surgery.
- 🔥 Ensure Smooth Recovery
- 💪 Regain Strength
- ⚖️ Maintain a Balanced Diet
Control Post-Meal Intake
🎯 Track Your Meal Calorie Intake
Use the Meal Calorie Calculator to control your post-meal intake and optimize your recovery diet after surgery.
- 🔥 Control Caloric Intake
- 💪 Support Post-Surgery Nutrition
- ⚖️ Maintain Healthy Eating Habits
Evaluate Risks
🎯 Assess Your Diet Risk
Use the Diet Risk Score Calculator to evaluate any potential risks in your diet after gastric sleeve surgery.
- 🔥 Manage Nutritional Deficiencies
- 💪 Ensure Adequate Protein Intake
- ⚖️ Optimize Long-Term Health
🎯 Use the Gastric Sleeve Weight Loss Calculator Now
Get personalized insights on your potential weight loss after gastric sleeve surgery. Use our calculator to better understand your bariatric journey and set realistic goals.