About the BMI Calculator
Body Mass Index (BMI) is a quick screening measure that compares your weight to your height to estimate whether you’re within a healthy weight range. While it doesn’t measure body fat directly, it’s widely used in health guidelines to flag possible risks associated with being underweight, overweight, or obese. Our BMI Calculator helps you compute your BMI instantly and interpret the result alongside common categories, so you can have a clearer conversation about your health with your clinician.
To use it, choose Metric or Imperial units, enter your weight and height, and we’ll calculate your BMI and show your category. You’ll also see a reference healthy‑weight range for your height, which can help you set realistic goals. Remember, BMI is a starting point—not a diagnosis. Factors like age, sex, ethnicity, body composition, and athletic training can affect how your BMI relates to health outcomes.
Athletes or very muscular individuals may register a higher BMI despite having low body fat, whereas someone with less muscle mass may show a normal BMI while carrying more body fat than expected. That’s why it’s helpful to pair BMI with other indicators such as waist circumference, body fat percentage, overall fitness, lab markers, and clinical assessment. Use our related calculators to build a more complete picture of your wellness journey.
Key features
- Instant BMI calculation in Metric or Imperial units
- Interprets BMI with standard adult categories
- Shows healthy weight range for your height
- Mobile‑friendly design for quick checks on the go
- Great companion to body fat and calorie planning tools
How to use
- Choose Metric (kg, cm) or Imperial (lb, in).
- Enter your weight and height.
- Calculate to get BMI, category, and healthy weight range.
Formula
Metric: BMI = weight (kg) ÷ [height (m)]²; Imperial: BMI = 703 × weight (lb) ÷ [height (in)]²
Variables
| Symbol | Meaning |
|---|---|
| Weight | Your body weight (kg or lb) |
| Height | Your height (m/cm or ft/in) |
Examples
- 70 kg, 175 cm → BMI ≈ 22.9 (Normal)
- 190 lb, 70 in → BMI ≈ 27.3 (Overweight)
- 62 kg, 165 cm → BMI ≈ 22.8 (Normal)
- 220 lb, 72 in → BMI ≈ 29.8 (Overweight, near Obese threshold)
Tips
- Take measurements at a similar time of day and with similar clothing for consistency.
- Track trends over weeks rather than focusing on a single reading.
- Combine BMI with waist measurement and fitness markers for better insight.