BMI Calculator

Free BMI calculator supporting metric and imperial units. Instantly calculate your Body Mass Index, see your BMI category (underweight, normal, overweight, obese), view a visual BMI scale, get your healthy weight range, and track your BMI history over time.

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Weight (kg)

Height (cm)

Enter your weight and height above to calculate your BMI in real time.

BMI Categories Explained

Underweight (BMI < 18.5)

May indicate malnutrition, an eating disorder, or other health conditions. Consult a healthcare professional.

Normal (BMI 18.5 - 24.9)

Generally considered a healthy weight range. Associated with the lowest health risks for most adults.

Overweight (BMI 25 - 29.9)

May increase risk of cardiovascular disease, type 2 diabetes, and other conditions. Lifestyle changes may help.

Obese (BMI >= 30)

Significantly increases risk of serious health conditions. Medical consultation is recommended.

Note: BMI is a screening tool, not a diagnostic measure. It does not account for muscle mass, bone density, age, sex, or ethnicity. Always consult a healthcare professional for a complete health assessment.

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How to Use BMI Calculator

1Select metric (kg/cm) or imperial (lbs/ft+in) units.
2Enter your weight and height.
3View your BMI, category, visual scale, and healthy weight range.
4Click 'Copy Result' to save or share.

Frequently Asked Questions

Body Mass Index (BMI) is a measure calculated from your height and weight. It's used as a screening tool to indicate whether you're underweight, normal weight, overweight, or obese.

BMI = weight (kg) / height (m)². For imperial units: BMI = (weight in lbs / height in inches²) × 703.

A BMI between 18.5 and 24.9 is considered normal weight. Under 18.5 is underweight, 25-29.9 is overweight, and 30+ is obese.

BMI is a screening tool, not a diagnostic measure. It doesn't account for muscle mass, bone density, age, sex, or ethnicity. Athletes may have a high BMI due to muscle. Always consult a healthcare professional.

Using the BMI Calculator is simple: visit the tool page, enter your data or input into the provided fields, and get instant results. Follow the controls on the page. Some functions require sign-in or a paid plan; see Pricing for limits.

Yes, the BMI Calculator is fully responsive and works perfectly on smartphones, tablets, and desktop computers. Simply open NexTool in your mobile browser and navigate to the tool — no app download required.

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About BMI Calculator

Use the controls shown by BMI Calculator to generate and review your result. Available features and usage limits depend on your plan. Check the tool's instructions and privacy information before submitting data.

Embed This Tool

Add BMI Calculator to your website. Paste the code below into your HTML. The iframe auto-resizes to fit the tool content.

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