BMI Calculator
Quickly compute your Body Mass Index using metric measurements. Enter your weight in kilograms and your height in meters to see the BMI value used worldwide to categorize underweight, normal, overweight, and obesity ranges.
Educational information, not professional advice.
Examples
- 70 kg and 1.75 m ⇒ 22.86 kg/m²
- 90 kg and 1.60 m ⇒ 35.16 kg/m²
- 58 kg and 1.65 m ⇒ 21.30 kg/m²
FAQ
What is BMI?
BMI is a ratio of weight to height used to classify underweight and overweight.
What BMI range is considered healthy?
A BMI between 18.5 and 24.9 is generally regarded as normal.
Does BMI account for muscle mass?
No, muscular individuals may have a high BMI despite low body fat.
Can I use pounds and inches?
Convert to kilograms and meters before using this calculator.
Is BMI appropriate for children?
Pediatric BMI is interpreted using age- and sex-specific percentiles; consult a pediatric growth chart or healthcare provider.
How often should I check my BMI?
Tracking BMI a few times per year is sufficient for most adults unless monitoring a medical weight management program.
Additional Information
- BMI is calculated by dividing weight in kilograms by height in meters squared (kg/m²).
- Adolphe Quetelet introduced BMI in the 19th century as a population-level health indicator.
- World Health Organization categories: underweight <18.5, normal 18.5–24.9, overweight 25–29.9, obesity ≥30.
- Athletes and muscular individuals may register higher BMIs despite low body fat—consider body composition measurements for context.