Step-by-step Instructions

1. Enter your height in either feet and inches or centimeters, depending on the options provided.
2. Input your weight in either pounds or kilograms, as specified by the calculator.
3. Click on the "Calculate" button after entering your height and weight.
4. View your BMI value, typically displayed as a number such as 25.3.
5. Check your weight status category based on your BMI, such as "Normal Weight," "Overweight," etc.

Body Mass Index (BMI) Calculator Breakdown

For Adults (18 years and older):

• Collect Input Data: Input age (years), gender (Male or Female), height (cm), and weight (kg).
• Calculate BMI: Use the BMI formula: \[ BMI = \frac{weight (kg)}{height (m)^2} \] Calculate height in meters: \( \text{Height in meters} = \frac{\text{Height in cm}}{100} \) Plug weight and height into the BMI formula to get BMI value.
• Interpret BMI Results: BMI categories:
  • Underweight: BMI < 18.5
  • Normal weight: BMI 18.5 - 24.9
  • Overweight: BMI 25 - 29.9
  • Obesity: BMI ≥ 30

For Children and Teens (2 to 17 years):

• Collect Input Data: Input age (years), gender (Male or Female), height (cm), and weight (kg).
• Calculate BMI Percentile: Use age and gender-specific BMI charts to determine BMI percentile.
• Interpret BMI Percentile: BMI percentiles indicate weight status:
  • Underweight: Less than 5th percentile
  • Healthy weight: 5th to less than 85th percentile
  • Overweight: 85th to less than 95th percentile
  • Obesity: Equal to or greater than 95th percentile

BMI Calculator Examples