Free Tool

BMI Calculator

Calculate your Body Mass Index instantly. Switch between Imperial and Metric units for accurate results.

ft
in
lbs

Your BMI

23.5

Normal

10 18.5 25 30 45

BMI Categories

Standard BMI classification for adults (WHO).

CategoryBMI Range
Underweight< 18.5
Normal18.5 – 24.9
Overweight25.0 – 29.9
Obese30.0 +

Frequently Asked Questions

What is BMI and how is it calculated?
Body Mass Index (BMI) is a simple measure of body fat based on your height and weight. It is calculated by dividing your weight in kilograms by your height in meters squared: BMI = kg / m². While it does not measure body fat directly, it correlates with more direct measures of body fat.
What is a healthy BMI range?
A BMI between 18.5 and 24.9 is generally considered healthy for most adults. However, BMI does not account for muscle mass, bone density, age, sex, or ethnicity. Athletes or muscular individuals may have a high BMI without excess body fat.
Is BMI accurate for everyone?
BMI is a useful screening tool for the general population, but it has limitations. It may overestimate body fat in athletes and muscular individuals, and underestimate it in older adults who have lost muscle mass. It should be used alongside other health indicators.
How often should I check my BMI?
For most adults, checking BMI once every few months or during routine health checkups is sufficient. If you are actively trying to lose or gain weight, monthly checks can help track progress, but daily fluctuations in weight are normal and not a concern.

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