BMI Calculator

Calculate your Body Mass Index (BMI) instantly. Enter your height and weight to understand your health category.

BMI Calculator

Modify values, click Calculate — the needle moves with your result.

Inputs

Age

Ages: 2–120 (for display only)

Gender

BMI does not depend on gender

Height (cm)

Weight (kg)

Disclaimer: For informational purposes only. This does not replace medical advice.

Result

Healthy BMI range: 18.5 – 24.9

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What is BMI?

BMI (Body Mass Index) is a simple number calculated from your height and weight. It helps estimate whether your body weight is generally in a healthy range. BMI is commonly used as a quick screening tool, not a medical diagnosis.

BMI formula

        BMI = weight (kg) ÷ [height (m)]²
      

If you use cm: convert to meters first (e.g., 176 cm = 1.76 m).

How to use this BMI calculator

Choose your unit system (Metric, US, or Other Units).
Enter your height and weight (optional: age for display).
Click Calculate to see your BMI and category.

Tip: For US Units, height is usually entered as feet + inches (e.g., 5 ft 9 in).

BMI categories

These ranges are commonly used for adults. Individual health can vary—use this as a guide and consult a clinician if you have concerns.

Category	BMI range (kg/m²)	What it generally means
Underweight	< 18.5	May indicate insufficient body weight for your height.
Normal	18.5 – 24.9	Often considered a healthy weight range for many adults.
Overweight	25.0 – 29.9	May be associated with higher health risk for some people.
Obesity	≥ 30.0	Often linked to increased risk of conditions like diabetes and heart disease.

Is BMI accurate?

BMI is useful for population-level screening, but it doesn’t measure body fat directly. For some people, BMI can be misleading.

BMI can overestimate

Highly muscular people (athletes)
People with higher lean mass

BMI can underestimate

Older adults with lower muscle mass
People with low lean mass

If you want a better picture, combine BMI with waist measurement, body fat %, or a clinician’s assessment.

How to interpret your result

Normal range doesn’t guarantee perfect health, but it’s a useful benchmark.
Overweight is a risk signal—look at lifestyle, waist size, and overall health markers.
Obesity is often linked to higher health risks—consider professional guidance for a sustainable plan.
Underweight may signal nutrition or health issues—get checked if it’s persistent.

FAQ

What is a good BMI?

For many adults, a BMI between 18.5 and 24.9 is considered a healthy range. But health depends on more than BMI—sleep, nutrition, activity, and medical history matter too.

Does BMI depend on age or gender?

The BMI formula doesn’t use age or gender, but interpretation can differ. For children/teens, BMI is evaluated using age- and sex-specific percentiles. For adults, the standard categories above are commonly used.

Why do athletes sometimes show “overweight” BMI?

Muscle weighs more than fat by volume. If you have high muscle mass, BMI can label you overweight even with low body fat. In that case, body fat % and waist measurement are more informative.

How often should I check BMI?

For general tracking, once every few weeks is enough. Daily changes are mostly water weight. Focus on trends over time.

More health calculators

Build a strong internal linking structure as you add tools. Start here:

Health Calculators Hub (recommended as your category page)
Calorie Calculator (next tool to add)
Body Fat Percentage Calculator (high demand)

Disclaimer

This calculator and content are for informational purposes only and do not replace medical advice. If you have health concerns, consult a qualified healthcare professional.