Check Your BMI With Metric or Imperial Units
Your BMI Result
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General BMI Ranges (Adults)
- Under 18.5 Underweight (general guideline)
- 18.5 – 24.9 Normal range
- 25 – 29.9 Overweight range
- 30 or higher Higher BMI range
These ranges are broad guidelines and may not apply to every individual. For personal health advice, please consult a healthcare professional.
Recent BMI checks
This BMI calculator is intended for general information and educational use only and should not be used to diagnose, treat or manage any health condition.
How to Use the BMI Calculator
You can quickly estimate your BMI using the units that feel most natural to you. Keep in mind that BMI is only one simple measure and does not replace professional health advice.
Select metric or imperial units
Choose whether you want to enter your height and weight in kilograms and centimeters or in pounds, feet and inches.
Enter your height and weight
Fill in your current weight and height as accurately as possible. You can tap “Try example” to see how the calculator works with a sample set of values.
Calculate and review your BMI
Click Calculate BMI to see your estimated BMI number and general category. Use this as a starting point for conversations with a healthcare professional if needed.
Why Use an Online BMI Calculator?
- Quick health snapshot: Get a rough estimate of where your weight falls in common BMI ranges using only height and weight.
- Metric and imperial support: Enter values in kg/cm or lb/ft/in depending on what your scale and height measurements use.
- Helpful for fitness tracking: Use BMI alongside other measurements such as waist size, progress photos or performance metrics when following a fitness plan.
- No data upload or login: All calculations run in your browser with simple HTML, CSS and JavaScript — no account, tracking or file uploads.
- Educational, not diagnostic: The tool is a useful way to understand BMI as a concept while keeping the focus on professional medical advice for real decisions.
What Is BMI and How Is It Used?
Body Mass Index (BMI) is a widely used screening tool that compares a person’s weight to their height. It is calculated by dividing weight in kilograms by height in meters squared. Many public health guidelines group BMI values into broad categories such as underweight, normal range, overweight and higher ranges. These categories can give a simple overview of whether your weight is proportionate to your height.
However, BMI does not directly measure body fat or overall health. Two people can have the same BMI but very different body compositions, fitness levels and health risks. Because of this, BMI is best viewed as one piece of information among many. If you are concerned about your weight or health, it is important to discuss your results with a doctor, dietitian or other licensed professional who can look at your full medical history and lifestyle.
Frequently Asked Questions (FAQs)
BMI, or Body Mass Index, is a number calculated from your height and weight that gives a rough idea of whether your weight is low, in a typical range or higher compared with common reference values. This calculator shows your estimated BMI and a general category label based on widely used ranges. It is for information only and not a medical diagnosis.
The standard formula is BMI = weight (kg) ÷ [height (m)]². When you choose imperial units, the calculator converts pounds to kilograms and height in feet and inches to meters before applying the same formula.
Many charts list a BMI roughly between 18.5 and 24.9 as a “normal” or “healthy” range for most adults. This tool uses similar ranges as a general guide. These cutoffs are approximate and may not apply in the same way to every individual or population.
No. BMI does not directly measure body fat. It does not distinguish between muscle, bone, water and fat, and it does not account for age, sex or ethnic differences. Athletes and very muscular people, for example, may have a high BMI but low body fat. For a fuller picture of health, other measurements and professional evaluation are needed.
No. This tool is only for general educational use and cannot replace professional medical advice, diagnosis or treatment. If you have concerns about your weight, BMI or health, please consult a doctor or other licensed healthcare professional.
BMI for children and teenagers is interpreted differently and usually compared against age- and sex-specific growth charts. This calculator is designed primarily for adults and older teenagers. For guidance about a child’s growth or weight, please speak with a pediatrician or other qualified health professional.