Calculate your Body Mass Index, discover your weight category and get a personalized healthy weight range instantly.
Enter your height, weight, age and gender using metric or imperial units.
Instantly calculate your Body Mass Index using the standard BMI formula.
See your weight category, healthy weight range and personalized health tips.
Body Mass Index (BMI) is a simple screening measurement that uses your height and weight to estimate whether you fall within a healthy weight range. It is widely used by health professionals as a quick indicator of potential weight-related health risks, although it does not directly measure body fat or overall fitness.
BMI gives a fast estimate of whether your weight falls within a healthy range for your height.
Doctors use BMI alongside other factors to assess potential weight-related health risks.
| Category | BMI Range |
|---|---|
| Underweight | Below 18.5 |
| Normal Weight | 18.5 – 24.9 |
| Overweight | 25.0 – 29.9 |
| Obese | 30.0 and above |
BMI = weight (kg) ÷ height (m)²
For imperial units, BMI = 703 × weight (lb) ÷ height (in)². This calculator automatically converts your inputs into the correct formula based on the unit system you select.
| Factor | Why It Matters |
|---|---|
| Muscle Mass | Athletes may show high BMI despite low body fat. |
| Age | Older adults naturally carry different fat distributions. |
| Body Composition | BMI does not distinguish between fat and lean mass. |
| Gender | Body fat percentage naturally differs between men and women. |
A BMI (Body Mass Index) Calculator helps estimate whether your weight falls within a healthy range for your height. By entering your height, weight, age and gender, this calculator instantly computes your BMI, identifies your weight category and provides a personalized healthy weight range.
Whether you're monitoring your fitness progress, planning a weight management goal or simply curious about your health status, this BMI Calculator gives you a quick and reliable starting point.
While BMI is a useful screening tool, it does not account for muscle mass, bone density, or fat distribution. Two people with the same BMI can have very different body compositions. For a more complete picture of your health, consider pairing your BMI result with body fat percentage, waist circumference and overall fitness assessments.
Muscle is denser than fat, so muscular individuals may register a higher BMI despite low body fat.
Waist measurements can offer additional insight into abdominal fat and related health risks.
This BMI Calculator provides an estimate based on the information you enter and standard BMI formulas. BMI is a general screening tool and does not directly measure body fat, muscle mass or overall health. Please consult a qualified healthcare professional for personalized medical advice.
A BMI Calculator estimates your Body Mass Index using your height and weight, helping identify whether you fall within a healthy weight category.
Yes. It uses the standard BMI formula to provide an accurate estimate. However, BMI does not account for muscle mass or body composition.
A BMI between 18.5 and 24.9 is generally considered a healthy weight range for most adults.
BMI is generally used for adults and may be less accurate for athletes, older adults, pregnant women and growing children.
Yes. This calculator is completely free and works on desktop, tablet and mobile devices.
Discover free calculators for BMI, body fat, calories, macros, hydration and many more health and fitness planning tools.
Browse All Health Calculators →