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BMI Calculator

Calculate your Body Mass Index (BMI) and see where you fall on the BMI scale with your healthy weight range.

Your BMI Result

About the BMI Calculator

BMI (Body Mass Index) is a widely used screening tool that estimates body fat based on height and weight. While it's not a direct measure of body fat percentage, it provides a quick assessment of whether an individual's weight is appropriate for their height.

How to Use

  1. Select Imperial (feet/inches and pounds) or Metric (centimeters and kilograms).
  2. Enter your height and weight.
  3. Click Calculate BMI.
  4. View your BMI value, category, and healthy weight range.

How It Works

BMI Formula: BMI = weight (kg) / height² (m)

Imperial: BMI = 703 × weight (lbs) / height² (inches)

Categories: Underweight < 18.5 · Normal 18.5–24.9 · Overweight 25–29.9 · Obese ≥ 30

Example

Height: 5'9" (175 cm), Weight: 165 lbs (74.8 kg):
BMI = 703 × 165 / (69²) = 116,000 / 4761 = 24.4 (Normal weight)

Frequently Asked Questions

BMI can be misleading for athletes with high muscle mass, as muscle weighs more than fat. A muscular person may have a high BMI but low body fat. For athletes, body fat percentage measurements are more accurate.
According to the World Health Organization (WHO), a BMI between 18.5 and 24.9 is considered healthy for adults. However, the ideal BMI may vary by age, ethnicity, and sex.
The BMI calculation is the same for men and women, but the interpretation can differ slightly. Women typically have more body fat than men at the same BMI. Some experts recommend different healthy ranges by sex.
The healthy weight range is calculated by solving the BMI formula for weight at BMI = 18.5 (lower bound) and BMI = 24.9 (upper bound), then converting to the appropriate unit.