Advanced BMI Calculator
Calculate your Body Mass Index, track trends, and get personalized health recommendations.
BMI Calculator
Calculate your Body Mass Index and track your health progress
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How to Use Our BMI Calculator
- Select your measurement system - Choose between Metric (kg, cm) or Imperial (lbs, inches).
- Enter your personal details - Input your weight, height, age, and gender for accurate calculation.
- Set a target BMI (optional) - If you have a goal BMI, enter it to track your progress.
- Click "Calculate BMI" - Get your BMI result along with category and health advice.
- Review your results - See your BMI on the gauge, compare with categories, and track your trend over time.
- Download your results - Save your BMI calculation as a PDF for your records.
Why Track Your BMI?
Health Awareness
Understand your weight status and potential health risks.
Progress Tracking
Monitor changes in your body composition over time.
Goal Setting
Set and track progress toward healthy weight goals.
Health Screening
Use as an initial screening tool for weight-related health issues.
Understanding BMI Categories
Underweight (Below 18.5)
A BMI below 18.5 is considered underweight. This may indicate insufficient body fat, which can lead to health issues like nutrient deficiencies, weakened immune system, and osteoporosis.
Normal Weight (18.5 - 24.9)
A BMI between 18.5 and 24.9 is considered normal or healthy weight. People in this range typically have lower risks for weight-related health problems.
Overweight (25 - 29.9)
A BMI between 25 and 29.9 is considered overweight. This category may indicate excess body weight that could contribute to health issues like high blood pressure and type 2 diabetes.
Obesity Class I (30 - 34.9)
A BMI between 30 and 34.9 indicates Class I obesity. This significantly increases the risk of weight-related health conditions and warrants consultation with a healthcare provider.
Obesity Class II (35 - 39.9)
A BMI between 35 and 39.9 indicates Class II obesity. This carries a high risk of serious health conditions and requires medical guidance for weight management.
Obesity Class III (40 and above)
A BMI of 40 or higher indicates Class III (severe) obesity. This is associated with the highest risk of weight-related health complications and requires medical intervention.
Frequently Asked Questions
BMI (Body Mass Index) is a measure of body fat based on height and weight. It's a simple screening tool that can indicate whether a person is underweight, normal weight, overweight, or obese, which helps assess potential health risks.
While BMI is a useful screening tool, it has limitations. It may not accurately reflect body fat in athletes with high muscle mass, older adults who have lost muscle mass, or certain ethnic groups. It's best used as a general indicator rather than a definitive measure of health.
For most people, checking BMI once a month is sufficient to track changes. More frequent measurements may not show meaningful changes and could lead to unnecessary concern over normal weight fluctuations.
A healthy BMI typically falls between 18.5 and 24.9. However, individual factors like age, muscle mass, and ethnic background can influence what's healthy for a specific person.
This calculator is designed for adults (18 years and older). Children and teens require age and sex-specific BMI percentiles, which are interpreted differently than adult BMI categories.
If your BMI indicates underweight, overweight, or obesity, consult with a healthcare provider for personalized advice. They can help determine if your weight poses health risks and recommend appropriate actions.