Check your Body Mass Index instantly with our free and accurate calculator tool
Use our free and accurate BMI Calculator to calculate your Body Mass Index and assess whether you're underweight, healthy, overweight, or obese — based on WHO guidelines.
BMI (Body Mass Index) is a simple health indicator that compares your weight to your height to determine your general body condition. It's widely used by doctors, nutritionists, and fitness experts to assess health risks.
Choose either Metric (kg/cm) or Imperial (lbs/ft+in) units. Formulas used:
Metric BMI: BMI = weight (kg) ÷ [height (m)]²
Imperial BMI: BMI = (weight (lbs) ÷ [height (in)]²) × 703
May indicate insufficient nutrition or underlying health conditions
Healthy weight range for most adults
Increased risk for health problems
Higher risk of serious health conditions
This calculator is perfect for individuals tracking fitness, healthcare professionals, or personal trainers helping clients assess their progress.
⚠️ Note: BMI is a general tool and does not account for muscle mass or body composition. Always consult your doctor for a full health assessment.
Metric: BMI = weight (kg) ÷ [height (m)]². Imperial: BMI = (weight (lbs) ÷ [height (in)]²) × 703.
Underweight below 18.5, Normal 18.5–24.9, Overweight 25–29.9, and Obesity at 30 and above, per WHO guidelines.
Yes. Choose Imperial units and enter your height in feet and inches; results update in real time as you type.
No. BMI is a general indicator that does not account for muscle mass or body composition — consult your doctor for a full assessment.