BMI Calculator - Free Online Body Mass Index Calculator
Calculate your BMI (Body Mass Index) and see which health category you fall into. Supports metric and imperial units.
About BMI Calculator
Body Mass Index (BMI) is a measure of body fat based on height and weight that applies to adult men and women.
- Underweight: BMI less than 18.5
- Normal weight: BMI 18.5 to 24.9
- Overweight: BMI 25 to 29.9
- Obese: BMI 30 or higher
- Choose height units (cm, m, ft, in) and weight units (kg, g, lbs, oz) independently
- Copy results to clipboard
Note: BMI is a screening tool and not a diagnostic tool. Consult a healthcare provider for personalized advice.
About BMI Calculator
Calculate your BMI (Body Mass Index) and see which health category you fall into. Supports metric and imperial units. BMI Calculator is a free online tool by NeXiilo — no sign-up required, and everything runs privately in your browser.
Whether you use it daily for work or occasionally for a quick task, BMI Calculator gives you fast, accurate results without uploading your data anywhere.
How to Use BMI Calculator
- Open the BMI Calculator above — paste or enter your input.
- Adjust any options to match what you need.
- Get instant results right in your browser.
- Copy or reuse the output wherever you need it.
📖 Learn more: BMI Guide — formula, chart & healthy range →
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Frequently Asked Questions
What is BMI?
BMI (Body Mass Index) is a numerical value derived from a person weight and height. It is used as an indicator of body fatness and overall health status.
How is BMI calculated?
BMI = Weight (kg) / (Height (m))². For imperial units: BMI = (Weight (lbs) / (Height (inches))²) × 703. The calculator handles both metric and imperial units.
What are the BMI categories?
Standard categories: Underweight (< 18.5), Normal weight (18.5-24.9), Overweight (25-29.9), Obese (≥ 30). These ranges may vary slightly by organization and population.
Is BMI an accurate health indicator?
BMI is a useful screening tool but has limitations. It does not distinguish between muscle and fat mass, so muscular individuals may have high BMI without excess fat. Consult healthcare professionals for comprehensive health assessment.
What is a healthy BMI?
For most adults, a BMI between 18.5 and 24.9 is considered healthy. However, ideal ranges may vary based on age, sex, ethnicity, and other factors. Athletes may have higher BMI due to muscle mass.