Bmi Calculator Stone And Feet

BMI Formula:

\[ BMI = \frac{weight (stone) \times 14 \times 703}{(height (feet \times 12 + inches))^2} \]

Body Mass Index (BMI):

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1. What is BMI?

Body Mass Index (BMI) 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:

\[ BMI = \frac{weight (stone) \times 14 \times 703}{(height (feet \times 12 + inches))^2} \]

Where:

\( weight \) — Weight in stones (1 stone = 14 pounds)
\( feet \) — Height in feet
\( inches \) — Additional height in inches
703 — Conversion factor (kg/m² to lb/in²)

Explanation: The formula converts stone to pounds and feet/inches to total inches before calculating the standard BMI ratio.

3. BMI Categories

Details:

Underweight: BMI less than 18.5
Normal weight: BMI 18.5 to 24.9
Overweight: BMI 25 to 29.9
Obese: BMI 30 or greater

4. Using the Calculator

Tips: Enter weight in stones, height in feet and inches. All values must be valid (weight > 0, height > 0).

5. Frequently Asked Questions (FAQ)

Q1: Is BMI accurate for everyone?
A: BMI may overestimate body fat in athletes and underestimate it in older people who have lost muscle mass.

Q2: What are the limitations of BMI?
A: BMI doesn't distinguish between muscle and fat, and doesn't account for fat distribution.

Q3: Is BMI different for children?
A: Yes, children's BMI is interpreted differently using age- and sex-specific percentiles.

Q4: What's a healthy BMI range?
A: For most adults, 18.5 to 24.9 is considered healthy.

Q5: Should I use stone/feet or kg/meters?
A: This calculator uses traditional UK units (stone/feet). For metric units, use kg and meters.