BMI Calculator
Results are estimates only and may not reflect your individual needs. This tool is for educational purposes only and is not medical advice.
Calculate your Body Mass Index from your height and weight.
Your result will appear here
Complete the form and press Calculate BMI.
Your BMI result
BMI is a screening tool, not a diagnostic measure.
Why use this calculator
BMI is a quick population-level screening tool used by clinicians worldwide to flag weight categories. While it has well-known limitations — it does not distinguish muscle from fat — it is a useful first number before exploring more precise measurements like body fat percentage.
How to use this calculator
Enter your age, then your height and weight. Select Metric or Imperial units first. Press Calculate to see your BMI and category.
What the result means
BMI is calculated as weight in kilograms divided by height in meters squared. The result is grouped into standard categories: underweight, normal weight, overweight, and obesity.
Important limitations
BMI does not distinguish between muscle and fat, and can be misleading for very muscular individuals, older adults, or certain body types. It is only calculated here for adults 18 and older.
FAQ
Is BMI an accurate measure of health?
It’s a useful screening tool at a population level, but it doesn’t directly measure body fat or overall health for an individual.
Why do I need to enter my age?
BMI categories used here are intended for adults 18 and older; this calculator does not support child or teen BMI percentiles.
Can I use imperial units?
Yes — switch to Imperial in the calculator to enter your height in feet and inches and your weight in pounds.
These estimates are for educational purposes only and are not medical advice. They are not intended for children, teens, pregnancy, eating disorder recovery, or medical conditions. BMI is a screening estimate for adults and does not diagnose health status or account for muscle mass, pregnancy, or medical conditions.