BMI Calculator
Calculate your Body Mass Index using metric or imperial units. Visual scale and color-coded categories.
How to bmi calculator
- 1Select your preferred unit system: Metric (cm, kg) or Imperial (ft/in, lbs).
- 2Enter your height.
- 3Enter your weight.
- 4View your BMI value, category, and position on the visual scale.
About This Tool
Body Mass Index (BMI) is a simple measure that uses your height and weight to estimate whether you are underweight, normal weight, overweight, or obese. While BMI does not directly measure body fat, it is widely used as a screening tool to identify potential weight-related health risks.
The formula is: BMI = weight (kg) / height (m)^2. For imperial units, the calculation is: BMI = (weight in lbs / height in inches^2) x 703. This calculator supports both metric and imperial units and displays a color-coded visual scale for easy interpretation. Note that BMI is a general guideline and does not account for factors like muscle mass, bone density, age, or gender.
Frequently Asked Questions
The standard WHO categories are: Underweight (BMI < 18.5), Normal weight (18.5 - 24.9), Overweight (25 - 29.9), and Obese (30 or above).
BMI can overestimate body fat in athletes and people with high muscle mass. It is a screening tool, not a diagnostic measure. Consult a healthcare professional for a complete assessment.
This calculator is designed for adults (ages 20 and older). BMI for children and teens is calculated differently and requires age- and sex-specific percentile charts.