Bmi Calculator Formula In Kg And Feet And Pounds

BMI Formulas:

\[ \text{BMI (imperial)} = \frac{\text{weight (lbs)} \times 703}{(\text{height (feet)} \times 12 + \text{inches})^2} \] \[ \text{BMI (metric)} = \frac{\text{weight (kg)}}{(\text{height (m)})^2} \]

Unit System:

Weight:

lbs

Height (feet):

Height (inches):

Height (meters):

BMI Result:

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1. What is BMI?

Body Mass Index (BMI) is a simple calculation using a person's height and weight. The formula is BMI = kg/m² where kg is a person's weight in kilograms and m² is their height in meters squared. It provides a reliable indicator of body fatness for most people.

2. How Does the Calculator Work?

The calculator uses two versions of the BMI formula:

\[ \text{BMI (imperial)} = \frac{\text{weight (lbs)} \times 703}{(\text{height (feet)} \times 12 + \text{inches})^2} \] \[ \text{BMI (metric)} = \frac{\text{weight (kg)}}{(\text{height (m)})^2} \]

Where:

Weight — Body weight in pounds (imperial) or kilograms (metric)
Height — Height in feet+inches (imperial) or meters (metric)
703 — Conversion factor for imperial units

Explanation: BMI correlates fairly well with body fat for most people, though it doesn't directly measure body fat.

3. Importance of BMI Calculation

Details: BMI is used to screen for weight categories that may lead to health problems. It's a simple, inexpensive method to assess whether a person has a healthy body weight.

4. Using the Calculator

Tips: Select your preferred unit system (imperial or metric), enter your weight and height. All values must be valid (weight > 0, height > 0).

5. Frequently Asked Questions (FAQ)

Q1: What are the BMI categories?
A: Underweight (BMI < 18.5), Normal weight (18.5-24.9), Overweight (25-29.9), and Obese (≥30).

Q2: Is BMI accurate for everyone?
A: BMI may overestimate body fat in athletes and underestimate it in older people who have lost muscle mass.

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

Q4: Should children use this calculator?
A: Children need age- and sex-specific BMI percentiles rather than the adult categories.

Q5: What's a healthy BMI range?
A: For most adults, 18.5 to 24.9 is considered healthy, though optimal may vary by individual.