BMI Calculator
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The BMI Calculator helps estimate body mass index and provides health recommendations based on height, weight, age, and gender. There are options to include additional health details and activity levels. The calculator is mainly intended for use by adults.
Body Mass Index (BMI)
Body Mass Index (BMI) is a measure of body fat based on height and weight that applies to adult men and women. BMI is calculated by dividing a person's weight in kilograms by the square of their height in meters. It provides a simple numeric measure to categorize individuals as underweight, normal weight, overweight, or obese.
BMI Calculator Components
A BMI calculation usually includes the following key components. These are also the basic components of a BMI calculator.
- Height and weight—the two primary measurements needed to calculate BMI. Height can be entered in feet and inches or centimeters, while weight can be entered in pounds or kilograms.
- Age and gender—while not directly used in the BMI calculation, these factors help provide more accurate health recommendations and ideal weight ranges.
- BMI calculation—the mathematical formula that converts height and weight into a single number that represents body mass index.
- BMI result—the calculated BMI value, typically ranging from 15 to 40 for most adults, with different ranges indicating different weight categories.
BMI Categories and Health Implications
BMI values are categorized into different ranges that indicate potential health risks and recommendations.
- Underweight (BMI < 18.5)—may indicate malnutrition, eating disorders, or other health problems. Individuals should consult with healthcare providers.
- Normal weight (BMI 18.5-24.9)—indicates a healthy weight range with lower risk of weight-related health problems.
- Overweight (BMI 25-29.9)—indicates excess weight that may lead to health problems. Lifestyle changes may be recommended.
- Obese (BMI ≥ 30)—indicates significant excess weight that increases risk of serious health problems including diabetes, heart disease, and stroke.