BMI Calculator
OnlineYour BMI Result
< 18.5
18.5 - 24.9
25 - 29.9
≥ 30
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No Data Stored
About This BMI Calculator
Our BMI calculator allows you to calculate your Body Mass Index from your height and weight. BMI is a quick measure of weight-for-height that is widely used to define underweight, overweight and obesity in adults based on WHO standards.
Key Features
- Dual Measurement Systems: Supports both metric (kg, cm) and imperial (lbs, in) units
- Instant Results: Your BMI and weight category will be calculated instantly
- WHO Standards: Applies World Health Organization BMI categorizations
- Detailed Interpretation: Gives you personalized health details based on your measurement
Beyond the Scale: Your Total BMI Health Guide
Your Body Mass Index (BMI) is not a mere number - it's an opening to your health risk and wellness potential. Simple weight-to-height formulas can be done anywhere, but our more sophisticated BMI calculator takes into account age, sex, and body type to provide you with individualized information you can use to enhance your well-being.
Why Simple BMI Calculators Mislead
Typical mistakes in the interpretation of BMI:
Body Composition
Muscle weighs heavier than fat - athletes tend to get misleadingly "overweight" readings.
Gender Differences
Women have higher body fat percentages than men at any given BMI.
Age Variations
Ideal BMI ranges vary as we age, but calculators rarely change.
When BMI Matters Most
Health Risk Assessment
BMI tests for possible weight-related illnesses such as diabetes and hypertension.
Child Growth Tracking
Pediatric BMI percentiles detect childhood trends towards obesity early on.
More than just a Number: Enhanced Features
Weight Analysis
Get a precise view of how many pounds you'd have to lose/gain to reach your desired BMI category.
Fitness Planning
Take tailored advice based on whether you need to work on diet, exercise, or both.
Important Limitations
Direct measurement of body fat is not done by BMI. Always use a healthcare professional for full evaluation - particularly if you are athletic (high muscle mass), pregnant, or older with muscle loss.
Get started on learning about your health measurements.
Frequently Asked Questions
What is BMI and why is it useful?
BMI (Body Mass Index) measures body fat in terms of weight and height. It is significant because it can help detect possible weight issues that could lead to health problems. Though it is not a direct measure of body fat, BMI agrees with more direct measures and is an easy screening method that is advised by health organizations across the globe.
How is BMI calculated?
BMI is determined the same for adults and children with the same formula: weight (in kg) divided by height squared (in m²). In imperial measurements, it is [weight (in lbs) / height squared (in inches)] × 703. Our calculator will convert automatically.
What are the categories of BMI?
Compared to WHO standards: Underweight (BMI 18.5), Normal weight (18.5-24.9), Overweight (25-29.9), and Obese (30 or more). Obesity is then subclassified into Class I (30-34.9), Class II (35-39.9), and Class III (≥40).
Are there any restrictions on BMI?
Yes. BMI fails to consider muscle mass, bone density, overall body composition, or racial/ethnic differences. Athletes might have a high BMI owing to greater muscle mass as opposed to body fat. Older individuals might have a normal BMI but decreased muscle mass. Always seek advice from a healthcare provider for complete health evaluation.
ℹ️ Important Note:
This calculator offers estimates for illustrative purposes only. BMI is not used for diagnosis. Use only healthcare professionals for official medical purposes.
Disclaimer: This tool is for illustrative purposes only and not for medical diagnosis.