BMI Calculator
Free BMI calculator. Calculate your Body Mass Index from your height and weight, see your weight category, and find your healthy weight range.
What is BMI?
Body Mass Index (BMI) is a quick screening number that relates your weight to your height. It’s calculated as weight in kilograms divided by height in metres squared. The standard categories are: under 18.5 (underweight), 18.5–24.9 (healthy), 25–29.9 (overweight), and 30+ (obese).
BMI’s limitations
BMI doesn’t distinguish muscle from fat, so very muscular people can read as “overweight” despite low body fat. It also doesn’t account for where fat is stored. Use it as a rough guide alongside other measures like waist circumference — not a diagnosis.
Frequently asked questions
What is a healthy BMI?⌄
A BMI between 18.5 and 24.9 is considered the healthy range. Below 18.5 is underweight, 25–29.9 is overweight, and 30 or above is obese.
Is BMI accurate for athletes?⌄
Not always. BMI doesn't distinguish muscle from fat, so very muscular people can read as overweight despite having low body fat.
How is BMI calculated?⌄
BMI equals your weight in kilograms divided by your height in metres squared. Our calculator handles the conversion from pounds and inches for you.
Have another question? Get in touch.