Calculate Your BMI
Works for adults with both Metric (kg, cm) and Imperial (lbs, in) units.
BMI Calculator
Check your Body Mass Index to understand your weight status in seconds.
Understanding your Body Mass Index (BMI) is a great first step in assessing your overall health and weight status. Our free online BMI calculator provides a quick and accurate calculation based on your height and weight. Use it to find out where you fall on the BMI scale and get a general idea of your healthy weight range.
How to Use the BMI Calculator
Our tool is designed for ease of use, whether you prefer metric or imperial units:
- Select Your Units: Choose between "Metric (kg, cm)" or "Imperial (lbs, ft, in)".
- Enter Your Details: Input your height and weight into the appropriate fields.
- Calculate Your BMI: Click the "Calculate BMI" button to see your result instantly.
Your BMI will be displayed on a color-coded gauge, making it easy to see your weight category at a glance.
Understanding Your BMI Result
Body Mass Index is a simple calculation that uses a person's height and weight. The resulting number is used to categorize whether a person is underweight, in a healthy weight range, overweight, or obese. The standard categories for adults are:
| BMI | Weight Status |
|---|---|
| Below 18.5 | Underweight |
| 18.5 – 24.9 | Healthy / Normal Weight |
| 25.0 – 29.9 | Overweight |
| 30.0 and Above | Obese |
Frequently Asked Questions (FAQ)
What is the BMI formula?
The formula for BMI depends on the units used. Our calculator handles both automatically:
- Metric: BMI = weight (kg) / [height (m)]²
- Imperial: BMI = weight (lb) / [height (in)]² * 703
Is BMI an accurate measure of health?
BMI is a reliable and widely used screening tool for assessing weight status at a population level. However, it does have limitations. It does not distinguish between fat and muscle mass. Therefore, a very muscular person (like an athlete) might have a high BMI but a healthy body composition. It should be used as a general guide, not as a definitive diagnostic tool.
Is my health data safe on this website?
Yes, 100%. This BMI calculator operates entirely within your web browser. The height and weight you enter are never sent to or stored on our servers. Your calculations are completely private and secure.