Our free BMI calculator helps you calculate your body mass index using height and weight, view your BMI classification, find your healthy weight range, and set weight goals. Supports both metric (kg/cm) and imperial (lb/in) units for men, women, and all ages.
Choose metric (kg/cm) or imperial (lb/in) measurements.
Input your current height and weight accurately.
See your BMI score, category, and what it means.
Find your ideal weight range based on BMI guidelines.
BMI is calculated by dividing your weight in kilograms by your height in meters squared. For imperial units, multiply by 703: BMI = (weight in lbs / height² in inches) × 703.
BMI = weight (kg) / height² (m)
BMI between 18.5-24.9 is considered normal/healthy weight
BMI doesn't distinguish between muscle and fat mass
Athletes may have high BMI due to muscle mass, not fat
BMI is a screening tool, not a diagnostic measure
Consult a healthcare provider for a complete health assessment
Waist circumference is another important health indicator
Calculate your Body Mass Index (BMI) instantly with our free BMI calculator. Find out if you're in a healthy weight range, view the BMI chart categories, and discover your ideal weight based on your height. Works with both metric (kg/cm) and imperial (lb/in) units.
BMI is calculated by dividing your weight in kilograms by your height in meters squared (kg/m²). For imperial units, the formula is (weight in pounds ÷ height in inches²) × 703. Simply enter your height and weight, and our calculator does the math instantly.
The WHO BMI classification: Underweight (below 18.5), Normal weight (18.5-24.9), Overweight (25-29.9), Obese Class I (30-34.9), Obese Class II (35-39.9), Obese Class III (40 and above). Your BMI category helps assess potential health risks.
Based on your height, our calculator shows your healthy weight range where BMI falls between 18.5 and 24.9. This gives you a target range for weight management, whether you need to lose or gain weight.
While the BMI formula is identical for both genders, body composition differs. Women naturally have higher body fat percentages. Our calculator provides the same healthy BMI range (18.5-24.9) for both, with optional gender input for context.
BMI is a useful screening tool but doesn't measure body fat directly. It may overestimate fat in athletes and underestimate it in older adults. For a complete health picture, consider waist circumference, body fat percentage, and other health markers.
Data sourced from trusted institutions
All formulas verified against official standards.