How to calculate BMI?
Body Mass Index (BMI) is calculated by dividing a person's weight by the square of their height. It is a screening tool used to categorize weight status (underweight, healthy weight, overweight, or obesity). There are different formulas for metric (kg/m²) and imperial (lbs/in²) systems.
Formula
Metric: BMI = Weight (kg) ÷ (Height (m))² Imperial: BMI = (Weight (lbs) ÷ (Height (in))²) × 703
Worked Example (Metric)
Weight: 70 kg, Height: 1.75 m.
- Square Height: 1.75 × 1.75 = 3.0625
- Divide Weight: 70 ÷ 3.0625 = 22.86
Result: The BMI is 22.86 (Healthy Weight).
Need to calculate this instantly?
Use our free BMI Calculator to get the answer in seconds.
Use Calculator