BMI Calculator
Calculate Body Mass Index (BMI) and healthy weight ranges based on height and weight.
Uses standard body mass index formula. General health categorization only.
How to Use the BMI Calculator
Calculate your Body Mass Index instantly with our free BMI calculator. BMI is a screening metric used by medical professionals to estimate whether an individual is at a healthy weight relative to their height. Toggle between metric and imperial systems, check your weight classification on our visual chart, and learn about healthy body ranges.
- Unit System: Bounded parameter in the mathematical model.
- Weight: Bounded parameter in the mathematical model.
- Height (cm): Bounded parameter in the mathematical model.
- Height (Feet): Bounded parameter in the mathematical model.
- Height (Inches): Bounded parameter in the mathematical model.
Understanding BMI Categories: Body Mass Index Math
Explore Body Mass Index metrics, health categories, imperial/metric formulas, and clinical significance.
Read Full Guide →How is BMI calculated?
The formula for BMI is: Weight (kg) / Height (m)^2 for metric, or (Weight (lbs) / Height (in)^2) * 703 for imperial.
What are the standard BMI weight ranges?
According to the World Health Organization (WHO): Underweight is less than 18.5, Normal weight is 18.5 to 24.9, Overweight is 25.0 to 29.9, and Obese is 30.0 or greater.
Why does BMI sometimes give inaccurate body assessments?
BMI does not distinguish between muscle mass and fat. Consequently, athletes or bodybuilders with high muscle mass may be classified as overweight or obese despite having low body fat.
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