1. What is BMI?

BMI (Body Mass Index) is a measure of body fat based on height and weight that applies to adult men and women. It provides a simple numeric measure of a person's thickness or thinness.

2. How Does the Calculator Work?

The calculator uses the BMI formula:

Where:

• \( weight \) — Weight in kilograms (kg)
• \( height \) — Height in meters (m)

Note: The calculator is pre-filled with 13 stone converted to kg (82.5538 kg).

3. Importance of BMI Calculation

Details: BMI is used to screen for weight categories that may lead to health problems but it is not diagnostic of body fatness or health of an individual.

4. Using the Calculator

Tips: Enter weight in kg (1 stone = 6.35029 kg) and height in meters. All values must be valid (weight > 0, height > 0).

5. Frequently Asked Questions (FAQ)

Q1: What is 13 stone in kg?
A: 13 stone equals 82.5538 kg (1 stone = 6.35029 kg).

Q2: What are normal BMI values?
A: Underweight: <18.5, Normal: 18.5-24.9, Overweight: 25-29.9, Obese: ≥30.

Q3: What are limitations of BMI?
A: Doesn't account for muscle mass, bone density, overall body composition, and racial/sex differences.

Q4: Is BMI different for children?
A: Yes, children's BMI is age and sex-specific and is referred to as BMI-for-age.

Q5: Should athletes use BMI?
A: Athletes with high muscle mass may have high BMI without excess fat, so other measures may be more appropriate.