This gastric sleeve weight loss calculator is designed to help Bariatric patients estimate how much weight they will lose with gastric sleeve following vertical sleeve gastrectomy (VSG) surgery.
Let’s consider a person who is:
- Current weight: 280 lbs
- Height: 5’6″
- Age: 35
- BMI: 45.2
Using the how much weight will i lose with gastric sleeve calculator:
- Input initial metrics
- The calculator estimates she could lose 60-70% of excess weight within 12-18 months
- Projected weight at 18 months: approximately 165-175 lbs
Gastric Sleeve Weight Loss Calculator
| Initial Weight | Height | Gender | 6-Month Projection | 12-Month Projection | 18-Month Projection | 24-Month Projection |
|---|---|---|---|---|---|---|
| 290 lbs | 5’7″ | Female | 230 lbs | 195 lbs | 180 lbs | 175 lbs |
| 320 lbs | 6’0″ | Male | 255 lbs | 220 lbs | 205 lbs | 200 lbs |
| 270 lbs | 5’5″ | Female | 215 lbs | 180 lbs | 165 lbs | 160 lbs |
| 350 lbs | 5’10” | Male | 275 lbs | 235 lbs | 220 lbs | 210 lbs |
| 240 lbs | 5’4″ | Female | 190 lbs | 160 lbs | 150 lbs | 145 lbs |
| 400 lbs | 6’2″ | Male | 310 lbs | 260 lbs | 240 lbs | 230 lbs |
| 310 lbs | 5’8″ | Female | 240 lbs | 205 lbs | 190 lbs | 185 lbs |
| 285 lbs | 5’6″ | Male | 225 lbs | 190 lbs | 175 lbs | 170 lbs |
| 330 lbs | 6’1″ | Female | 250 lbs | 215 lbs | 200 lbs | 195 lbs |
| 265 lbs | 5’9″ | Male | 210 lbs | 180 lbs | 165 lbs | 160 lbs |
Gastric Sleeve Average Weight Loss Tabular Chart
| Time Post-Surgery | Expected Weight Loss (% of Excess Weight) | Average Weight Loss (lbs) |
|---|---|---|
| 3 months | 30-40% | 30-40 lbs |
| 6 months | 45-55% | 45-55 lbs |
| 9 months | 55-65% | 55-65 lbs |
| 12 months | 60-70% | 60-70 lbs |
| 18 months | 70-80% | 70-80 lbs |
| 24 months | 75-85% | 75-85 lbs |
| 36 months | 80-90% | 80-90 lbs |
Gastric Sleeve Weight Loss Formula
The formula used to calculate potential weight loss after gastric sleeve surgery is:
Excess Weight = Current Weight - Ideal Body Weight (IBW)
Expected Weight Loss = Excess Weight × Expected Loss PercentageFor a person weighing 300 lbs with an IBW of 150 lbs:
- Excess Weight = 300 – 150 = 150 lbs
- Expected Loss at 12 months (65%) = 150 × 0.65 = 97.5 lbs
- Projected Weight = 300 – 97.5 = 202.5 lbs
How to calculate how much weight will i lose with gastric sleeve?
To calculate your potential weight loss:
- Calculate your IBW using the following formulas:
- Women: 100 lbs for first 5 feet + 5 lbs per additional inch
- Men: 106 lbs for first 5 feet + 6 lbs per additional inch
- Determine excess weight by subtracting IBW from current weight.
- Apply the expected loss percentage based on time post-surgery.
For a 5’8″ woman weighing 250 lbs:
IBW = 100 + (8 × 5) = 140 lbs
Excess Weight = 250 – 140 = 110 lbs
Expected Loss at 6 months (50%) = 110 × 0.50 = 55 lbs
What is the 30/30 rule after gastric sleeve?
The 30/30 rule is a post-operative guideline that recommends:
- Taking at least 30 minutes to eat each meal
- Waiting 30 minutes after eating before drinking liquids
Daily Schedule:
- 8:00 AM: Begin breakfast
- 8:30 AM: Finish breakfast
- 9:00 AM: Resume drinking water
- Continue this pattern for each meal
How much weight should I be losing 4 weeks after gastric sleeve?
At 4 weeks post-surgery, patients typically lose between 20-25 pounds (9-11 kg). This includes:
- Initial water weight loss
- Reduced caloric intake
- Metabolic changes
For a patient starting at 260 pounds, the first four weeks typically show a steady decline in weight. In the initial week, they often lose around 8 pounds, primarily due to fluid loss. The second week sees a reduction of approximately 6 pounds, followed by 5 pounds in week three, and 4 pounds in week four. This gradual tapering is normal and results in a total weight loss of 23 pounds by the end of the first month, which falls well within the expected range for post-operative progress.
What is the 20 20 20 rule for gastric sleeve?
This rule guides proper eating habits:
- Take meals lasting at least 20 minutes
- Chew each bite at least 20 times
- Use a portion size of about 20ml (approximately 4 teaspoons)
The 20/20/20 rule is a guideline for proper eating habits after gastric sleeve surgery. This rule emphasizes taking meals that last at least 20 minutes, thoroughly chewing each bite at least 20 times, and using portion sizes of approximately 20ml (about 4 teaspoons).
For example, when having breakfast, a patient might consume 2 oz of scrambled eggs, carefully measured into 20ml portions.
Each bite should be chewed 20 times, and the entire meal should be consumed over a 20-minute duration.
References:
- American Society for Metabolic and Bariatric Surgery (ASMBS) – https://asmbs.org/
- Cleveland Clinic – https://my.clevelandclinic.org/health/treatments/17285-bariatric-surgery
- Mayo Clinic – https://www.mayoclinic.org/tests-procedures/sleeve-gastrectomy/about/pac-20385183
Related Tools:
