1. What is the Reverse BMI Calculator?

This calculator determines how much weight you need to gain to reach a specific BMI target. It's particularly useful for underweight individuals or those recovering from illness who want to achieve a healthy weight.

2. How Does the Calculator Work?

The calculator uses the reverse BMI formula:

Where:

• \( BMI \) — Target Body Mass Index (kg/m²)
• \( height \) — Height in meters
• \( current\ weight \) — Current weight in kilograms

Explanation: The formula first calculates what your weight should be at your target BMI, then subtracts your current weight to determine how much you need to gain.

3. Importance of Weight Gain Calculation

Details: Achieving a healthy BMI is important for overall health. Being underweight can lead to weakened immune function, fertility issues, osteoporosis, and other health problems.

4. Using the Calculator

Tips: Enter your target BMI (typically 18.5-24.9 for healthy range), your current height in meters, and your current weight in kilograms. All values must be valid positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is a healthy target BMI?
A: For most adults, 18.5-24.9 is considered healthy. Consult your doctor for personalized advice.

Q2: How quickly should I gain weight?
A: A safe rate is typically 0.5-1 kg per week. Rapid weight gain can be unhealthy.

Q3: What if the calculator shows negative weight gain?
A: This means you're already above your target BMI weight. You might need to lose weight instead.

Q4: Does this account for muscle vs. fat?
A: No, BMI doesn't distinguish between muscle and fat mass. Athletes may need alternative assessments.

Q5: Is this calculator suitable for children?
A: No, BMI calculations for children use different percentile charts based on age and sex.