Check your body mass index in seconds
Enter your height and weight — this BMI calculator instantly shows your body mass index, category, and healthy weight range.
BMI categories chart
The standard adult BMI ranges used by health organizations worldwide.
| BMI range | Category | What it means |
|---|---|---|
| Below 18.5 | Underweight | You may be underweight for your height. Consider talking to a healthcare provider about a nutrition plan. |
| 18.5 – 24.9 | Healthy weight | You're within the healthy weight range for your height. Keep up your current habits. |
| 25.0 – 29.9 | Overweight | You're in the overweight range. Small, sustainable changes to diet and activity can help. |
| 30.0 and above | Obese | You're in the obese range. Consider speaking with a healthcare provider about a plan tailored to you. |
Want your exact number? Use the BMI calculator above.
About body mass index
Body mass index (BMI) is a screening measure that divides your weight by the square of your height. It's used by doctors and health organizations worldwide as a quick, free way to flag whether someone might be underweight, at a healthy weight, overweight, or obese.
The formula is BMI = weight (kg) ÷ height (m)², or 703 × weight (lb) ÷ height (in)² in imperial units. A BMI of 18.5–24.9 is generally considered healthy for most adults.
BMI has real limitations — it can't tell muscle from fat, so athletes and very muscular people often score "overweight" despite low body fat. It also doesn't account for age, sex, or where fat is carried on the body. Use it as a general indicator, not a diagnosis.
Sample BMI calculations
Common height and weight combinations, already calculated.
5ft 4in
5ft 5in
5ft 6in
BMI calculator questions
What body mass index means and how to use it.
What is BMI (Body Mass Index)?
BMI is a simple screening measure that uses your height and weight to estimate whether you're in a healthy weight range. It doesn't measure body fat directly, but it correlates with it for most people.
How is BMI calculated?
BMI = weight (kg) ÷ height (m)². In imperial units, BMI = 703 × weight (lb) ÷ height (in)². Both formulas give the same result — our calculator handles the conversion automatically.
What is a healthy BMI range?
For most adults, a BMI between 18.5 and 24.9 is considered a healthy weight. Below 18.5 is classified as underweight, 25–29.9 as overweight, and 30 or above as obese.
Is BMI accurate for everyone?
No. BMI doesn't distinguish between muscle and fat, so athletes and very muscular people often score as "overweight" despite having low body fat. It's also less reliable for older adults, pregnant women, and children.
Does BMI account for muscle mass?
No — BMI only uses height and weight, so it can't tell muscle from fat. Someone with a lot of muscle can have a high BMI while still being lean and healthy.
What BMI is considered overweight?
A BMI between 25.0 and 29.9 is classified as overweight. A BMI of 30 or higher falls into the obese category.
How do I find my healthy weight range?
Enter your height in the calculator above — it shows the weight range that corresponds to a BMI of 18.5 to 24.9 for your exact height.
Smart Body Fat Scale
Track weight, BMI, and body fat percentage automatically after every weigh-in.
As an Amazon Associate we may earn from qualifying purchases made through links on this page, at no extra cost to you.
BMI is a general screening tool, not a diagnosis. Talk to a healthcare provider about what a healthy weight looks like for you.