Cálculo Perda De Peso Pós Bariátrica

After bariatric surgery, weight loss is typically measured in percentage of excess weight lost. This calculator helps you track your progress and understand what your results mean.

How to Use This Calculator

To calculate your post-bariatric weight loss percentage:

Enter your initial weight before surgery in kilograms
Enter your current weight after surgery in kilograms
Enter your ideal body weight (IBW) in kilograms
Click "Calculate" to see your results

The calculator will show you:

Percentage of excess weight lost
Percentage of total weight lost
A comparison to typical weight loss goals

Weight Loss Formula

The calculator uses these formulas to determine your weight loss:

Excess Weight Lost (%) = [(Initial Weight - IBW) - (Current Weight - IBW)] / (Initial Weight - IBW) × 100

Total Weight Lost (%) = (Initial Weight - Current Weight) / Initial Weight × 100

Where:

Initial Weight = Your weight before bariatric surgery
Current Weight = Your weight now
IBW = Ideal Body Weight (calculated as 22 × height²)

Note: These calculations assume you're using the same formula for IBW. Some surgeons may use different methods to determine IBW.

Understanding Your Results

Example Calculation

Let's say you weighed 120 kg before surgery and are now at 90 kg. Your IBW is calculated as 22 × (1.7m)² = 51.8 kg.

Excess Weight Lost = [(120 - 51.8) - (90 - 51.8)] / (120 - 51.8) × 100 = (68.2 - 38.2) / 68.2 × 100 = 30 / 68.2 × 100 = 44.0%

Total Weight Lost = (120 - 90) / 120 × 100 = 30 / 120 × 100 = 25.0%

This means you've lost 44% of your excess weight and 25% of your total weight.

Interpreting the Results

Typical weight loss goals after bariatric surgery include:

50-75% of excess weight loss within 1-2 years
15-20% of total weight loss in the first year
Additional 10-15% of total weight loss in the second year

Common Mistakes to Avoid

When tracking your weight loss after bariatric surgery, be aware of these common pitfalls:

Not accounting for water weight: Rapid fluctuations in weight can be normal, especially in the first few weeks after surgery.
Ignoring maintenance phase: After the initial rapid weight loss, progress may slow as your body adapts to the new digestive system.
Comparing to pre-surgery weight only: It's more meaningful to compare to your IBW and excess weight.
Not tracking non-scale victories: Energy levels, clothing fit, and overall health improvements are important indicators of progress.

Frequently Asked Questions

How long does it take to see results after bariatric surgery?: Most patients see initial weight loss within the first few weeks, with continued progress over several months. The maintenance phase typically begins after 6-12 months.
Is it normal to gain weight after surgery?: Yes, some patients experience temporary weight fluctuations, especially in the first few weeks. This is often due to water retention and changes in bowel function.
How accurate is the IBW calculation?: The IBW formula (22 × height²) is a common method, but some surgeons may use different formulas. Always use the method your surgeon recommends.
When should I see a doctor about my weight loss progress?: If you're not losing weight as expected, experiencing severe side effects, or notice unusual symptoms, consult your healthcare provider immediately.
Can I use this calculator for other types of weight loss?: This calculator is specifically designed for post-bariatric weight loss. For other types of weight loss, you may need different calculations.