monitor_weight
BMI Calculator
Check your body mass index.
Enter your weight and height to instantly find your BMI and health category.
Instant Results
Get your BMI and health category the moment you click calculate.
Clear Categories
See exactly where you fall — underweight, normal, overweight, or obese.
Free & Unlimited
No signup, no watermarks, no limits. Use it as many times as you like.
What is BMI?
Body Mass Index (BMI) is a simple calculation used to assess whether a person has a healthy body weight based on their height and weight. It is widely used as a screening tool for health risks.
How is BMI calculated?
BMI is calculated by dividing weight in kilograms by height in meters squared. This tool automatically calculates your BMI and shows your health category instantly.
BMI categories
- Underweight: BMI less than 18.5
- Normal weight: BMI 18.5 – 24.9
- Overweight: BMI 25 – 29.9
- Obese: BMI 30 or more
Frequently Asked Questions
BMI is calculated by dividing your weight in kilograms by your height in meters squared (BMI = weight (kg) / height (m)²).
Underweight is below 18.5, Normal weight is 18.5–24.9, Overweight is 25–29.9, and Obese is 30 or above.
BMI is a useful screening tool but does not account for muscle mass, bone density, or body composition. Consult a healthcare professional for a full assessment.