BMI CALCULATOR
Calculate your Body Mass Index instantly. Supports metric and imperial units. Shows BMI category, healthy weight range, and what it means.
// enter your height and weight above
⚠ BMI is a screening tool, not a diagnostic measure. It does not account for muscle mass, bone density, age, sex, or ethnicity. Consult a healthcare professional for a complete health assessment.
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// FAQ
FREQUENTLY ASKED QUESTIONS
Q1.What is BMI and how is it calculated?
BMI (Body Mass Index) is a numerical value derived from your height and weight. The formula is weight (kg) ÷ height (m)². In imperial units: (weight in lbs ÷ height in inches²) × 703. It provides a quick estimate of body fatness for most adults.
Q2.What is a healthy BMI range?
For adults, a BMI between 18.5 and 24.9 is considered healthy. Below 18.5 is underweight, 25–29.9 is overweight, and 30 or above is classified as obese. These thresholds are set by the World Health Organization (WHO) and are widely used in clinical settings.
Q3.Is BMI accurate for everyone?
BMI is a useful population-level screening tool but has known limitations. It does not distinguish between fat and muscle mass, so athletes and highly muscular individuals may have an elevated BMI without excess body fat. It also does not account for age, sex, ethnicity, or fat distribution. For a complete picture, consult a healthcare professional.
Q4.What is the difference between metric and imperial BMI calculation?
Metric BMI uses kilograms and centimeters: BMI = kg ÷ (m²). Imperial BMI uses pounds and inches with a correction factor: BMI = (lbs ÷ in²) × 703. Both formulas produce the same result — the factor 703 converts between unit systems. This calculator supports both.
Q5.What does the healthy weight range mean?
The healthy weight range shown is the span of weights that would give you a BMI between 18.5 and 24.9 at your current height. It's the weight target range associated with lowest health risk according to standard BMI guidelines. Individual health goals may differ — your doctor can help set a personalized target.
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