BMI Calculator
Calculate Body Mass Index from height and weight using metric or imperial units.
Calculate Body Mass Index from height and weight. Results are general information only, not medical advice.
Your BMI
24.2
Normal weight
Approximate healthy weight range for this height: 53.5–72 kg (BMI 18.5–24.9).
BMI is a screening estimate. It does not account for muscle mass, age, sex, ethnicity, or health conditions. Speak with a qualified health professional for personal advice. See the Disclaimer.
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How to use this tool
- Choose metric (kg, cm) or imperial (lb, ft, in).
- Enter your weight and height.
- Read the BMI value, category, and approximate healthy weight range for that height.
Frequently asked questions
What is BMI?
Body Mass Index, or BMI, is a number calculated from your weight and height. The standard formula divides weight in kilograms by height in metres squared, and this tool also accepts imperial units and converts them automatically. Doctors, dietitians, and researchers have used BMI for decades as a quick screening number because it only requires two easy measurements. Public health surveys use average BMI figures to track population weight trends over time, and some clinics use it as a first step before ordering more detailed tests. It is important to remember that BMI is a screening tool, not a diagnosis: it estimates whether weight is in a typical range for height, but it does not measure body fat percentage, muscle mass, or overall health directly.
Who is a BMI calculator for?
A BMI calculator is useful for adults who want a quick, general sense of how their weight compares to their height, whether for personal awareness, tracking progress alongside diet or exercise changes, or preparing questions for a doctor or dietitian appointment. Fitness enthusiasts sometimes use it alongside other measurements like waist circumference for a fuller picture. It is not designed for children or teenagers, since growth charts use age-specific percentiles instead of adult BMI bands. It is also less reliable for pregnant people, elite athletes with high muscle mass, or older adults with reduced muscle mass, so those groups should rely on a health professional's assessment rather than this number alone.
What do the BMI categories mean?
Common adult bands are underweight below 18.5, normal weight 18.5 to 24.9, overweight 25 to 29.9, and obesity 30 and above. Categories are general guides and can vary by guidelines and individual factors.
Is this medical advice?
No. Justools provides a calculator for general information only. BMI does not diagnose disease. Speak with a qualified health professional before making health decisions.
Can I use imperial units?
Yes. Switch to imperial and enter pounds plus feet and inches. The tool converts to metric behind the scenes for the BMI formula.
Is my height and weight uploaded?
No. The calculation runs entirely in your browser. We do not store your measurements on a server.
Why might BMI be misleading?
Muscle mass, bone density, age, sex, and ethnicity can change how BMI relates to health. Two people with the same BMI can have very different body composition.
Processed locally in your browser. Your files are never uploaded to our servers.