BMI Calculator
Enter your height and weight to calculate your Body Mass Index, see your category, and find a healthy weight range for your height.
How to use the BMI calculator
- Choose Metric (centimeters and kilograms) or Imperial (feet, inches, and pounds) units.
- Enter your height and weight in the fields shown.
- Click "Calculate" to see your BMI, weight category, and a healthy weight range for your height.
Why use a BMI calculator?
Body Mass Index is a quick, widely used screening number that relates your weight to your height, letting you see at a glance whether you fall into the underweight, normal, overweight, or obese range as defined by the World Health Organization. It's a useful starting point for a conversation about weight and health, and this calculator also shows the weight range that would put you in the "normal" category at your current height, so you can see roughly how much change, if any, that would involve. BMI does not account for muscle mass, bone density, age, or sex, so it can be misleading for athletes, bodybuilders, older adults, and pregnant women. This tool is for general informational purposes only and is not a substitute for professional medical advice — talk to a doctor or dietitian about what's healthy for your individual body.
What is BMI and how is it calculated?
Body Mass Index is weight relative to height, calculated as weight in kilograms divided by height in meters squared (or 703 x weight in pounds divided by height in inches squared for imperial units).
Is BMI accurate for everyone?
BMI is a quick screening measure, not a diagnosis. It doesn't distinguish muscle from fat, so it can overestimate body fat in very muscular people and underestimate it in older adults who've lost muscle mass. Consult a doctor for a full health assessment.
What do the BMI categories mean?
Under 18.5 is classified as underweight, 18.5 to 24.9 as normal weight, 25 to 29.9 as overweight, and 30 or above as obese, based on World Health Organization thresholds.